What your Electronic Power Control (EPC) Warning Light really means

Computers are ubiquitous or rather microcomputers, microprocessors and their peripheral systems and chipsets are.  As such, they can be found in most electronic devices, ranging from laptops to printers, routers, radios, walkie-talkies, cell-phones and toys to mention but a few. In fact, microprocessors are so common place that they've taken over most hand held and personal electronic devices so-much-so that they are even embedded in our entertainment equipment, our cars, motorcycles, aeroplanes, ships and trains. It can thus be said that electronics in all its technological forms, have completely changed how we live  our lives. These systems along with its sensors, sendors and actuators are referred to as On-Board Diagnostics (OBD) and since it's in its second revision, known as OBD-II or just OBDII.

Furthermore  these On-board diagnostic (OBDII) digital computers interfaced with its dependency modules, electro-mechanical systems and sensors built into our cars have collectively taken-over and superseded most mechanical linkage functions, that were previously and traditionally used for acceleration, steering control and parking brake among several other.  So, welcome to the world of  drive-by-wire, (electronic throttle control) steer-by-wire, shift-by-wire, brake-by-wire and fly-by-wire which is currently widely used in aviation. 

What your Electronic Power Control (EPC) Warning Light really says!

Your car's EPC light essentially indicates that there is an issue with the  torque system of your vehicle. This torque system is your car's acceleration and braking system that now operates via drive-by-wire, shift-by-wire and brake-by-wire. In a nutshell, it's a computer chip supervised electronic system (ECU) that replaced the cable linkage previously situated between the carburetor and the accelerator pedal with an electrical/electronic interface. 

This amber EPC light is an advisory light rather than a warning light -since warning lights are red in colour- is illuminated when the ECU detects a glitch in the torque system. When a glitch is detected, in most cases the ECU will enable 'limp home mode'. Limp mode is a fail-safe software-embedded, security and safety feature that  inhibits the system, activates a  rev limiter, shuts off boost partially or completely, resulting in a maximum 2500 RPM.  

Thereby leaving only sufficient power to safely drive the car home in some cases. In other cases it could prevent the car from even starting.  Limp mode also acts as a safe-guard against further engine / transmission trouble or possible runaway.  Switching off the engine and disconnecting the battery may in some cases momentarily cure limp mode, but then again it may not due to the ECU's  non-volatile memory. However as an  advisory light, it begs for an OBD-II diagnostic scan, so that the Trouble Code (DTC) error may be diagnosed and repaired. This is best done sooner rather than later, as Limp mode sometimes manages to cures itself, yet bound to repeat itself continually until repaired. The ECU has a counter / timer monitoring how many times the same DTC was detected since the last start-up. If just a few times (considered negligible / mistakenly triggered) the counter resets itself and starts to recount from when it happens again.

Having said that, EPC lights and drive-by-wire systems aren't exclusive to "VAG cars" like most mechanics would have you to believe. The EPC light is a mandatory part  of the OBD-II system hence fitted as standard equipment on "all post '96 cars". OBD regulations are written into Government legislation globally so that in time, the Department of Transport (DoT) may require all vehicles to regularly go for mandatory carbon emission tests in order the achieve road roadworthiness. They will access your cars under dash 16 pin obd connector to check its "Readiness Status". Readiness is an 2 x 4 digit binary number (hexadecimal) that look something like 1011 0110 or 1110 0101 or 0000 0000 or any combination of zeros and ones which is subject to the workings of equipment fitted in your vehicle.

Anyway, if you don't know, VAG stands for Volkswagen AG. The AG is an abbreviation for Aktiengesellschaft - implying incorporated. Aktiengesellschaft is the German term for a Public Limited Company (PLC). Thus the  VAG group is comprised of ten car brands  viz, Volkswagen, VW Commercial vehicles, Volkswagen Marine, Audi, SEAT, CUPRA, ŠKODA, Lamborghini, Porsche, Bentley and Ducati, spanning across five European countries.  In a nutshell most if not all these vehicles have a EPC light and torque control circuit operated via drive-by-wire as standard equipment. But as mentioned previously, an EPC lights with drive-by-wire and brake-by-wire is not exclusive to VAG cars.  

This torque circuit (throttle-by-wire) is a collection of interconnected electronic components amongst which are the car's battery, ignition switch, throttle body position sensor / potentiometer and throttle body actuator / stepper motor. The ECU itself, the braking system sensors and the wiring harnesses that supplies voltage / earth and feedback to and from the accelerator position sensor/ potentiometer and the throttle body motor, the cruise control switch, the instrument cluster and even one of the brake globes itself.

Possible problems

So by implication, with so many points of failure, so much can go wrong, For example, a loose battery terminal could cause the accelerator potentiometer input voltage to momentarily disappear for a fraction of a second, thus detected by the ECU which  would then trigger limp mode. It could also be caused by a speck of dust has settled on the potentiometer slider that creates a brief intermittent contact. The ECU will however detect this and implement limp mode. 

Then there is the dozens of wiring harnesses with their hundreds of connections. Several of them instrumental in the automotive torque circuit. Since electronics has taken over our cars, some having more than 3 dozen individual harnesses, collectively  comprising of more than 3000 wires and a third as many connectors. It gives you an idea of multitude of electrical problems that can occur.

Male and female wiring harness connectors used in the automotive industry are fairly reliable however due to the under-bonnet conditions like extreme engine heat and morning freezing temperatures, humidity, steam, condensation, oil splatter, dust and vibration, can collectively give rise to corrosion inside wired plugs and sockets. Corrosion normally causes high resistive electrical conditions which upsets the functionality of the circuit concerned.  

This could cause a myriad of problems in a myriad of circuits among which could be the MAF circuit, causing poor driveability and sudden jerking motions during acceleration flanked by untimed detonations.  It could be the MAP circuit causing poor fuel economy and difficult starting and rough idling. Catalytic converter wiring would cause dark exhaust smoke that  smell like rotten eggs due to the excess sulphur and the engine performance will be sluggish..... etc. Wait for the follow-up!

NO PROBLEM FOUND

NO PROBLEM FOUND

Have you ever taken your under warranty car to your service agent after experiencing extreme EPC Light and Engine Light activity, only to be told "No problem found"? Does the inside of your under 75,000km  car sound like an aviary when you turn-on it's fan? Or, do you constantly have to top-up your oil level between oil changes or at least every 1500 km? How do you handle it, when you go to the agents, to complain about excessive oil consumption, only to be  told that, “all cars use oil and oil consumption is a normal part of a car’s operation, beside oil consumption issues were disclosed in the vehicle owner’s manual". Has your car behaved like a washing machine during a rinse and spin cycle while driving on the freeway, misfiring, shaking and scaring the living day light out of you? If yes to any of the above, then you must be driving a VAG Car - VW, Skoda, Audi or Seat. Yes, when those injector coils go faulty in mid travel, it really frightens you because the car feels like is going to fall apart any moment.  

This also happens to VW, Jetta, VW Caddy, Volkswagen Jetta, Volkswagen Golf, Volkswagen Beetle, Volkswagen Passat, Volkswagen Touareg, Porsche Cayenne, Volkswagen Amarok, Volkswagen Caddy, Volkswagen CC,  Volkswagen Fox, Volkswagen Gol G5,   Volkswagen Golf Mk6,  Volkswagen Jetta, Volkswagen Scirocco,  Volkswagen Sharan, Volkswagen Tiguan, Volkswagen Touareg,   Volkswagen Touran, Audi A3, Audi A6, Audi A7, Audi A8, Audi Q5, Audi Q7, Volkswagen Phaeton, Volkswagen Polo, Volkswagen  Lupo and Volkswagen Passat.

I've experienced the radiator fan blades disintegrate while driving, and the unbalanced rotation caused the same, exact, identical, engine shake. Then I've also experienced starting difficulties, irregular idling, poor fuel economy, hesitant acceleration, engine misfires and engine stalls. Not to mention the the constant, "in your face" red engine  warning light. All of which turned out to be components of the charge air path, especially the Mass Airflow Sensor (MAF).

When the "No problem Found" response became unbearable, it was time for self discovery. So what I've come to realize is that a mass air flow sensor, is integral part of every modern VAG engine and is normally situated somewhere inside the intake air duct, between the air filter and the engine. 

I've owned several cars, amongst which were Renault, Opel, Mercedes Benz and Mazda yet never ever had the need to replace a MAF even after several years. However with VW, it needs to be cleaned or replaced regularly every 2-3 years. Cleaning a MAF is cheaper than replacing it though replacing a MAF sensor is just easier. It is DIY job because the MAF replacement cost at a VW dealers averages about R1500,00. 

MASS AIRFLOW SENSOR 

VAG engines require a "perfect blend" of air and fuel for absolute combustion. This "perfect blend" is known as stoichiometric or Lambda = 1, which essentially means "the mixture is right" in mechanical jargon. The vacumn caused by the turbo blower and the pistons down-ward travel creates air charge. The main aim of the charge air path is to provide a smooth increase in torque, and to deliver high efficiency throughout its  operating ranges. This air charge is measured by the MAF, so by implication a  properly functioning MAF is absolutely crucial to a smooth ride. But in modern Engine Management Systems their are several components that contribute to maintaining this "perfect blend" among which are:-

1) The Electronic throttle control (EPC)
2) Charge air pressure sensor G31
3) Mass Air Flow (MAF) sensor G70
4) Barometric Pressure (BARO) sensor F96
5) Intake Air Temperature (IAT) sensor G42 / G299

So any fault in the Mass Air Flow (MAF) sensor G70 will trigger the EPC light, because the Motronic engine control unit (ECU)  uses it as an engine load signal and as a reference data to calculate the  signal plausibility of other sensor inputs, when and how much fuel to deliver, and when to generate a spark for the relieve cylinder. At the same time, it will also trigger a DTC in memory. The MAF also works in conjunction with an O2 sensor that provides a “closed-loop” feedback  known as short term fuel trim (STFT) / Long term fuel trim (LTFT), in order to make corrections to that predicted air mass. If the air filter isn't replaced on a regular basis, a build- up of impurities in the MAF will cause it to start failing when it gets too dirty to do its job and trigger the EPC light. 

REDUCED COST OF OWNERSHIP

REDUCED COST OF OWNERSHIP

Global automaker Volkswagen AG hasn't been the flavour of the month for more years than I care to remember. Their unpopularity started with the emissions scandal that engulfed the company for cheating on emissions tests over a period of six years; not to mention the recalls and poor customer service at virtually all their service centers globally that further pissed off their clients. It was their initial denial, arrogance  and passing of the buck by high ranking VW executives that severely angered VW car owners. The cheating and lying of these individuals compromised most VW owners globally because the trade-in value of their vehicles fell substantially. Dealers were saddled with VW vehicles cars that wouldn't sell because the general public eschewed VW with a passion. 

In an attempt to win back customer confidence, Volkswagen is offering a six-year or 72,000 miles warranty on two of its all new big-ass 2018 sport utility vehicles (SUVs). This new 72,000 miles, (120 000 km) warranty surpasses, the industry-standard of 60,000 mile (100 000km) by a good 20 000 km or 1 year's worth of driving. Generally sport utility vehicles only come with a standard three-year/36,000-mile warranty whereas Volkswagen  announced  their enhanced warranty for both their 2018 Atlas and Tiguan SUVs. According to Hinrich Woebcken, Chief Executive Officer for Volkswagen Group of America, the objective of this extended warranty is to reduce the cost of ownership for the owners of these new Volkswagen SUVs. The new 4Motion AllWheel Drive VW Alas shares the MQB platform with the Mk7 Golf hatchback; and it can park itself, it can do so even do so in  perpendicular parking spaces. It monitors blind spots and  resist errant lane changes, and even sports the ability to adaptively cruise  in stop-and-go traffic. 



The interior of the Atlas is aesthetically pleasing and cavernous with three rows of seats that provides comfortably seating for  seven adults. It also sports a  meaningful cargo space behind the third-row seat, which when folded flat extends to a user-friendly deck for loading. The Atlas is propelled by a 2.0-litre turbo L4, with an eight-speed automatic front-wheel drive, whereas the 3.6-litre V-6 engine version comes in all-wheel drive. These big-ass SUVs are what Big-ass Americans want, and the Atlas is designed to accommodate the biggest asses you can imagine. The Atlas of the forerunner to the new-look, completely redesigned Tiguan compact SUV destined to be built in  Mexico. This 5-door, 5-seat Tiguan SUV is available in two 1.4 TSI engines, the first as a 92kW for both the Trendline (manual only) and Comfortline manual, while Comfortline auto (DSG) gets the 110kW version.  The 2.0 TSI 162kW top of the range Tiguan with Golf GTI power will be available shortly, to be followed by the 2.0 TDI engines that are available in 81kW, 105kW or 130kW. The Tiguan is sold in some 170 countries globally, which makes this SUV one of the important vehicles in the Volkswagen stable alongside the Golf, Polo and Passat.



However, regardless of the newest and the latest in VW motion, the Diesel emission scandal is still haunting the automaker and in the wake of their admission of guilt, Volkswagen executives agreed to spend up to $25 billion in the USA, to settle legal claims brought against them by Volkswagen owners,  state governments, environmental regulators and VW car dealers. They even offered to buy back about half a million  diesel vehicles that are known to be polluting the USA. In an attempt to rebuild goodwill, Volkswagen offered to pay out $1,000 in cash or dealership credits to VW vehicle owners who can also receive a free 24-hour road service for three years. Over and above this, VW dealers will offer them a $2,000 cash rebate toward their  new car purchase.

Volkswagen's hopes to become the world’s largest automaker after being in this top spot for only two months, were dashed after Toyota Motor Corp reported global production figures of almost a quarter million ahead of Volkswagen today. The  Renault-Nissan Alliance with Mitsubishi also pulled ahead of Volkswagen, leaving this giant German car maker in 3rd spot. For now at leat, but what will the future hold?

WHY DOES VOLKSWAGEN AND AUDI KEYS COST SO MUCH?

WHY DOES VW AND AUDI KEYS COST SO MUCH? 

I'm certain it's a fair question to ask, "Why does a Volkswagen or Audi key cost so much?" It's obviously not made of solid gold or  platinum, nor from the mythical "rear and expensive" material called kryptonite, yet it seems to commands the same price range. For that matter, "Why do all automotive keys cost so much"?It's totally incomprehensible that a key would cost more than the monthly installment of the latest version of the car whose key is in 
question. Its just really expensive, so how to manufacturers justify these charges? Some locksmith can supply the same Volkswagen key or any car key for that matter for a lot less than any automobile agent can; and they can normally also replace most car keys much quicker than the agents. That being said, most people scramble around to get a replacement key after they've lost the only key they have. So, the first rule of owning a car key says, "if there's a possibility of losing the key, or there's a chance of it getting stolen, or locked inside the car, or even breaking, then its imperative get a copy cut before your are forced to have a copy made". 

DUPLICATING A KEY FROM ANOTHER KEY

Today almost all cars manufacturers have pretty much developed their own special type of locks. For example,  Ford and Jaguar have adopted the 8 cut Tibbe lock whereas VAG and Volvo have adopted the ‘Laser’ type lock. So before we continue, we have to acknowledge that not all keys are born equal, because keys generally fall in several categories. There are non vehicular dimple keys and tubular keys, then there  are standard single sided flat steel keys. Then there are non-transponder edge-cut automotive double sided keys steel keys and to duplicate these from another key is the easiest and costs the least and average around R50.00, mearly because those key blacks are cheap and abundant. Then there are the transponder type keys (laser  cut) keys and to duplicate these from another key cost a lot more than that of a flat steel key.  They average around R150.00 - R200.00 because the blank is substantially more expensive, but the main reason for their cost higher, is that one also requires a sophisticated milling key cutting machine with a special cutting adapter kit that cost ten times more than a flat key cutting machine. 

Then there is the high security Tibbe key and to duplicate such a key, roughly cost the same as cutting a transponder key. Tibbe keys also requires the same sophisticated milling key cutting machine fitted with a different cutting Tibbe Key Adapter Kit.  

CUTTING A KEY FROM A CYLINDER  

When you need a key cut but you don't have a sample key, the cost will depend  on the make, the model, the type and the year of manufacture of such vehicle. In such a case the key can be reverse engineered by a locksmith of considerable skill, from either the ignition lock, which then has to be removed from the car or from the drivers door lock, which would also have to be removed from the car. A successfully made key should then be able to start the car, unlock the doors, the boot and the glove compartment as well as the petrol cap if all components are still standard originals. 

Reverse engineering a key is a time consuming, thus a costly exercise and it would be well worth to remember "the first rule of owning a car key". Alternatively, the key can be duplicated from its key code, using the appropriate key duplication equipment and software which is more geared towards the later model cars. However few locksmiths offer this service and since the Tibbe key is not all that common, very few locksmith have the equipment and skill to cut them.

CUTTING TRANSPONDER KEYS

Transponder keys are extremely diverse and quite costly to duplicate for a number of reasons. The key blanks are more costly and the decoding equipment and bitting software needed to duplicate them is also expensive. Probably the best way to duplicate these keys, are from the key code using a computerized key cutting machine. Key codes can be generated from your VIN using the freely downloadable AutoCode - VIN to Key Code Generator App. However, you pay per code, on-line. CodesExpress is similar, but InstaCode is the most comprehensive key data software available today.   It  is compatible with a wide range of electronic, and manual key cutting machines and able to produce the  bitting number from the key code automatically. Its menu allows selections for manufacturer, model and key blank and code.  

But that's not the end of it, because after the key is cut it will open the door but will not start the engine. The fob key electronic head needs to be programmed or replaced with the appropriate frequency, either 315MHz VW/Jetta, 433MHz VW/Audi, or 434MHz VW/Skoda, 868MHz Audi, etc, etc,  and further programming to allow the remote to activate and operate the central locking. You can do this yourself but only if you have a second key, and I'll describe the procedure  in a success blog.

PROGRAMMING

The Philips  Crypto code  transponder duplication / RFID transponder complexity still needs to be contended with after providing proof that the car to which the key in question belongs, is rightfully yours. Programming the Philips  Crypto code Transponder is expensive puerly because the equipment like the JMD Handy Baby, or the MiraClone, or the 884 Decryptor Ultegra, or the AD900Pro needed to duplicate the transponder are currently quite expensive.  

IMMOBILIZER

Virtually every car built after 1996 is equipped with some sort of an anti-theft device that circumvents “hot wring” or theft of the 
the car. Volkswagen calls its system, an Immobilizer. So when the VW key with its embedded  Phillips cryto  transponder / T6 Glass Chip RFID transponder  is inserted into the key hole, it is energized by the reader coil located in the steering column, allowing the evaluation unit (ECU) to authorize  the car to start. If all's well and the codes is verified as correct the car will start, if not, the car will start momentarily and switch off immediately.

CONCLUSION

Having looked at what it takes to produce a valid key, it goes without saying that it's going to be expensive purely because non of the transponder copier manufacturers and key cutting machine manufacturers and the key moulding manufacturers have had a return on their investments as yet. This should change over time but only if enough people loose their keys or if everyone who owns a single key has it duplicated. Essentially when the demand for keys increases. Then and only then will the price reduce. Be that as it may, since Volkswagen doesn't manufacture or cut the key themselves nor program the transponder chip but only act as a middle man to get the key to you, its probably best that you go directly to the locksmiths they use to produce their keys and since Volkswagen's locksmith use the same equipment and keys used by the professional locksmith trading down the street, it is imperative that you support him rather than pour your hard earned cash into the VW money pit. Just last week, a friend who works as a chauffeur was the victim of a  home burglary and the thief stole the key to his boss's Mercedes Benz C320.  When they phoned Orbit Motors to get a replacement, they were quoted R10K  for a key. The bossman was astounded at the price and repeated that he wants to bey a key and not shares in Orbit Motors.

WARNING

Do not be tempted to but keys or transponders off e-bay, e-bid or other e auction. In most cases these transponder chips are plain 
junk. They do not work. There are so many fake items manufactured globally and electronic chips are no different. I've bought several dozen of 4000 series integrated circuits off e-bay, most of which were duds. I think these chips are produced when the production lines were set up and the masks haven't been perfected, which should've ostensibly been dumped, but some how they find their way onto the black market which in my estimate is just another money pit. 

RANSOMWARE

RANSOMWARE

VW POLO HIGHLINE

Do you know what Ransomware is? Well, for those who don't know, it is a type of computer malware that encrypts your computer documents, photos, databases, files and other general computer data, then demands payment (ransome) to obtain the decryption key. Computer hijackers and hackers normally spread Ransomware, attached to an emails that once executed, opens a security hole in your computer system for them to exploit. The latest ransomware makes use of your computer's RDP (Remote Desktop Protocol) port to gain access to computers holding sensitive information. The RDP port is aka as port 3389. However ransomware is not limited to laptops, notebooks and desktop computers, virtually every device that are connected to an IoT (Internet of  Things) platform can be encrypted for ransom and the possibilities are quite varied. An IoT platform is essentially a suite of interrelated Internet enabled devices that deploy  applications that manage, monitor, and control connected devices.

The Internet of Things embrace technologies like Wi-FI, UWB, CAN bus, Bluetooth, ZigBee, RFID (radio frequency identification), GSM OnStar Telematics (GPS,  Tracking & remote door unlocking, Voice recognition & wireless Internet connection) Flexray, sensors, smart phones, smart homes, digital machines and mechanical objects, people or even animals that are allocated a unique identifiers -IPv6 address- with the innate ability to transfer data over a network. 

Can you imagine a hijacker capable of hacking healthcare IoT devices and medical implants; holding pacemaker patients hostage demanding payment or he will turn off their device, without any need for physical contact.  Can you imagine your car demanding money before it will start? Yes, I'm sure you can. Every VW Audi, Skoda and Seat or for that matter every car truck or tractor that was manufactured before 1996 with its glut of sensors, smart relays and internet connected telematics can hold its owner to ransom. An ECU may not hold ransomware per se but it might as well be because every time your cars coughs or sneezes it demands money. And when it refuses to start, it is as if you are being blackmailed by Volkswagen Audi Seat or Skoda into paying them some money before they get your car to start.  

I have a friend who owns a Porsche that he hardly ever drives. When he attempted starting her after about a month in the garage, the  multi-function dashboard display lit-up in red, displaying "battery/alternator visit workshop", then reverted to its normal colours displaying "undervoltage consumer defective". When the specialist Porsche mechanic arrived and jump started the car, several other light that were never on started to light up. Like the brake pad warning light, oil level monitoring failure and the check engine light and finally the  visit workshop message.

Understandably, the amount of automation in our cars today are suppose to make them safer, better and cheaper to maintain but the converse is true. The average VW owner spends virtually 30% of the value of the car before they finally give up on the car. This implies that by the time three VW owners get rid of their cars, Volkswagen got paid for four. VAG car keys are another hijack or ransome. 

Not too long ago I locked my keys in the boot of my VW Polo Highline. I simply thought just buying another key would solve all my problems. But I was mistaken nor was it that simple. I had to furnish them with my Particulars of purchase, copy of registration document,  and the VIN, just to prove that th car belonged to me. The cost of the key wasn't a few hundred rands but a few thousand rands from the a VW dealer, but that's just for the key. It still had to be programmed at a undeclared cost, so that the RFID transponder in the steering stalk of the car can communicate with the key. If that's not holding car owners to ransom then I don't know what is.

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EPC NIGHTMARE

EPC WARNING LIGHT

Over the past 3 years I have had some  13775 EPC information requests. That's roughly 4500 request per year, each and everyone of  them EPC related.  I manages to help several Vag car owners with their EPC problems however many were unable to give me the  DTC codes that could be causing the EPC problems. So, If you have a scan of your car feel free to upload it to my blog, I will analyse it and post the answer for everyones benefit.  I have found that the commonest EPC problem is the accelerator pedal potentiometers. However they cannot be purchased as a separate item. You have to buy the complete accelerator pedal. There is a plug that is attached to  the accelerator pedal, the plastic bit where the yellow stickers are, contains the pots.  If you are having EPC problems you are not alone. Read some of your fellow Vag car owners woes.

NO EPC DTC CODES

What is EPC on a Volkswagen? My car loses power all the time. If  I turn the car off and leave it for a while,  the problem goes away. This happened to be a couple of months ago, and  I was forced to take  it to a VW dealer.  They had no idea what to do. The car idles  really badly and the EPC light is on from the moment I start it,  besides now the check engine light is also on. I'm  thinking about replacing the throttle body but it cost about is $600. That's crazy man.

TOO VAGUE & NO EPC DTC CODES

My EPC light came on and car lost all power, so now I am having the most weirdest problems. I got stuck on the freeway, my EPC light came on and I had to pull onto the shoulder of the road because I lost acceleration. Disconnected and reconnected the negative battery terminal to reset the system, then she was driving fine. Took it to VW guy but he has no idea what an EPC problem is or at least he wanted me to  pay him  first before would help. He wants $85 an hour.

NO EPC DTC CODES, CAN'T ASSIST

I have an  VW Polo 1.4 and the 'Check Engine light' and EPC warning light  blinks for the past few months. Replaced the throttle body and potentiometer  and wiring to the engine manifold were replaced.  The same problem still persists and car  will stall at random causing these warning lights and EPC to switch on.

NO EPC DTC CODES, NO HELP

My polo 1.2  epc light comes on when I stop at traffic lights and goes into limp mode then can only drive  15 mph max without   pressing the accelerator. Took  it to a service agents who condemned  the throttle body, so had it replaced. The EPC light still comes on.

Feel free to upload your VW, SKODA, SEAT & AUDI scans.

EPC LIGHT - REVISITED

VW POLO EPC LIGHT 

Most VW Polo, Golf, Audi, Passat and  Skoda  vehicles and probably every other VAG cars appears to have problems lately. In one sentence, the most common of these problems seems to be on obd diagnostics the culprit being the  wiring that interconnect all the electronic modules, aka the OBD II / CANbus. Virtually every car diagnostic test done on several different VAG cars produced the same faults. This implies that they are common, since they are recurring on different owners cars.  I can relate to this from my Television engineering days, when several same-make and same-model televisions all appeared to give the same problems. These VAG cars all seemed to have Intermittent / Implausible messages on the Data Bus and its highly unlikely that it could be the electronic modules themselves that are intermittent. Should this be the case, each and every one of these VAG cars then needs to be recalled because it looks like a defective design or assembly line problem.  But that's  wishfully thinking on my part which will obviously be met with and answer like - highly unlikely.

Wiring harnesses and cable assemblies for electrical buses interconnecting several MOSFET fast switching electronic modules each having an edge connector / plug whether it is gold plated or not, has parasitic capacitance. Add this  to the edge connector resistance and crimped wire contacts inside the plugs makes for interesting intermittent connections. The following list are faults /errors  that showed up on diagnostic tests on cars with EPC light problems, which  gives you some idea what I'm referring to. I've  abbreviated "Powertrain Data Bus" to PDB: in order to stop each fault from running onto two lines. Excessive comms errors and internal control module memory error intermittent are common faults caused by wiring harnesses.

SCAN TOOL ERROR CODES

1) 01312 - Powertrain Data Bus:  - Faulty

2) 18034 - PDB: error P1626 Missing Message from TCU  (Transmission Control Unit)
3) 18043 - PDB: error  P1635 Missing Message from A/C Controller
4) 18044 - PDB: error  P1636 Missing Message from Airbag Controller
5) 18058 - PDB: error  P1650 Missing Message from Instrument Cluster
6) 18270 - PDB: error  P1862 Missing Message from Instrument Cluster 

7) 18055 - PDB: error  P1647 Check Coding of ECUs
8) 18056 - PDB: error  P1648 Failure
9) 18045 - PDB: error  P1637 Missing Message from Electric Load Controller
A) 18097 - PDB: error  P1689 Implausible Message from Elect. Load Controller

B) 18104 - PDB: error  P1696 Implausible Message from Steering Column Controller
C) 18107 - PDB: error  P1699 Missing Message from Steering Wheel Electronics

D) 18057 - PDB: error  P1649 Missing Message from ABS Controller
E) 18259 - PDB: error  P1851 Missing Message from ABS Controller
F) 18090 - PDB: error  P1682 Implausible Message from ABS Controller
G) 18261 - PDB: error  P1853 Implausible Message from ABS Controller

Implausible signal means that it is "intermittent", even intermittent at the time the diagnostic tester was interfacing with the ECU's, TCU's, STC's ABS's, A/C etc... "Missing Message" implies absolutely no contact (Open Circuit) with the respective modules at the time of testing. Since VAG cars became inundated with electronic modules, our individual cars each have a few hundred more electrical connections than the previous generation of cars each and everyone of them subject to the tresses and strains of  the bumps on uneven roads and spirited driving. Add engine heat, steam, dampness and other weather conditions to this equation and suddenly these connections become tarnished over time. Tarnished connections are certainly not electrically sound and one way to clean these contacts is with contact spray but graphite or a grey ink rubber would be more effective to clean the tarnish off the gold plated PCB edge connectors. The Bentely VW manual suggest replacement of the whole wiring harness if  any problems arise but it comes at a cost of  $798.00 and that's for a 2007 VW Polo highline. I would hate to know what it would cost for a 2013 Volkswagen Touareg or 2013 Volkswagen Amrok not to mention 2013 Audi A8 or Audi TT .

VAG cars are really nippy and a joy to drive and I'm certain the bulk of VAG car owners enjoy spirited driving but many many VAG car driver probably regret this since they only experienced  EPC light troubles after they did some real spirited driving. I know this is absolutely true for Audi TT drivers who complained that their cars were fin until they gave it a nice workout. It is obvious centrifugal force, torque, tension, flexing, wind resistance and inertia plays their respective roles on the plugs and connectors. The EPC Light problems above, D through G appears to dictate that the ABS Controller is faulty or its edge connector / plug is faulty or the harness is faulty. B through C suggest that the Steering Wheel Controller is faulty or its edge connector / plug is faulty or the harness is faulty is causing the EPC light  to light up. Numbers 5&6 seems to favour the Instrument Cluster as faulty or its edge connector / plug is faulty or the harness is faulty which causes the EPC light to light up. Number 9 and letter A seems to blame the Electric Load Controller for triggering the EPC light. Numbers 1-4 and 7&8 seems to suggest some other electronic module caused the EPC light to light up. All these modules have one thing in common, they are all associated with the Powertrain Data Bus. In essence any module associated with the Powertrain Data Bus can cause the EPC light on VW Polo or other VAG cars to trigger.

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