DIAGNOSING EPC LIGHT PROBLEMS
VW Polo EPC light goes on and the car won't rev. Audi MIL and EPC light turn on and car goes into lip mode. SEAT suddenly has no acceleration yet has maximum of 1200 RPM. SKODA accelerator problem, won't rev. Audi EPC light on and transmission is locked in park.
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| Audi and VW crankshaft position sensors. |
Question?
Hello mate...My car was running really sweet when suddenly I'm having throttle issues! I was going to my girls house when all of a sudden, smack bang in the middle of the road, I have no acceleration. The car just cut the revs into idle and causing the EPC light on the dashboard to light up. I managed to get it off the road out of the traffic. Several attempts later to get her to rev up but nope, absolutely nothing. So I phoned the towing service and the dude checked under the bonnet to make sure everything was in place so he disconnected the battery for a while so it would reset the computer. It still wouldn't rev, so he hauled it onto the truck and brought it to my house. My neighbour Freddy has a VCDS which he plugged in and these fault codes showed up. I'm desperately in need of help because I have no idea how to solve this problem?
Chassis Type: 6K - Seat Ibiza/Cordoba
Scan: 01 02 03 08 15 17 25 45 56
Mileage: 97850km/60801miles
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Address 01: Engine
Part No: 6K0 906 032
Component: 1.8L R4/20VT SEA 0002
Coding: 11500
Shop #: WSC 78904
5 Faults Found:
18047 - Accelerator Position Sensor 1/2 (G79/G185): Implausible Signal
P1639 - 35-00 - -
18039 - Accelerator Position Sensor (G79): Signal too High
P1631 - 35-00 - -
18042 - Accelerator Position Sensor 2 (G185): Signal too High
P1634 - 35-00 - -
17950 - Angle Sensor 1 for Throttle Actuator (G187): Implausible Signal
P1542 - 35-10 - - - Intermittent
17581 - Angle Sensor 2 for Throttle Actuator (G188) Signal too High
P1173 - 35-10 - - - Intermittent
Answer!
Hay George.This is quite interesting that both your accelerator potentiometers and both your throttle body potentiometers are acting up at the same time. Normally I would say that your accelerator pedal needs to be replaced if only G79/G185 flags repeated DTCs. Alternatively say that your throttle body needs cleaning and adaptation if G187/G188 flags repeated DTCs. But this is certainly not the case though both these circuits are notorious for "No Throttle Response", limp mode and turning on the EPC light. However to me it looks more like the voltage supply line to both devices is acting up, that it's intermittent. Since the throttle and the accelerator are each connected directly to the same control module (ECU) I'm tempted to say that the ECU plug is probably loose or corroded or the fuse holder that supplies the ECU with terminal 30 (12V unswitched) and the relay that supplies terminal 15 (12V switched) needs to be checked for proper contact and corrosion. What I am willing to say is that you have a wiring harness problem, so check continuity between the ECU and the accelerator pedal 6 pin plug and the ECU and the Throttle body 6 pin plug. Make certain to do adaptation afterwards and check throttle valve control in group 060“ (G187/G188), and especially 62 (G187/G188 & G79/G185), and 63 (Kick-down) and if you have a cruise control group 66 as well.Question?
I'm Renshaw and I have an Audi A4 1.8T. When I started my car from cold, the EPC light came on and the engine just stalled. Made a couple more attempts to start but engine just cranks and wouldn't start. After a while I tried again and it started just fine and it drove fine. The following day I couldn't start the engine again. So like before I waited a while and it started fine and I drove all week without any EPC problems, until this morning while standing in peak hour traffic my car just died. After a few tries the car finally started but while I was driving both the EPC and the MIL (check engine light) came on, the engine lost power and was idling at 1200 RPM. This happened a few time over the past month and I'm really loosing my patient with my Audi A4. So when it happened again I limped to the service agents who got the 2 DTC errors: P0321 Ignition/Distributor Engine Speed Input Circuit Range/Performance and P0322 Ignition/Distributor Engine Speed Input Circuit No Signal, but they could get the car to switch off like it did with me. Something like the toothache goes away when you get to the dentist. Anyway, I've search the Internet forums for a EPC problem similar to mine but found nothing. I still don't have any idea what's going on. Can you please help me and I would be very appreciative and thank you.Answer!
Hi Renshaw, thanks for your question. The problem you describing is fairly common on Audi which normally flags any or all of the following DTCs - P0320, P0321, P0322 and P0323 at the same time. This is undoubtedly or rather more often than not caused by your Engine Speed (RPM) sensor signal (crankshaft sensor) that is out of phase. Bear in mind that your car has a DIS and not a mechanical distributor which is normally driven by a gear on the camshaft. This implies that your camshaft / crankshaft have embedded magnets that energizes a hall sensor (crankshaft sensor) or an inductive sensor mounted on the cylinder block which measures crankshaft speed (interval), that provides the engine speed signal to the ECU. It also doubles-up as the signal that determines the time and duration of the ignition (spark) as well as injector timing. Depending on the model, the crankshaft sensor is next to the oil filter. Crankshaft position sensor (G28) failure is also common on the new VW Polo the new Jetta.NB!
If you need help with your EPC problem or an explanation of your diagnostic scan and willing to share the findings with fellow Vag owners, feel free to link to this post and upload your question and a scan of your car. Not every problem can be dealt since there are a fair amount of overlap / common problems, but I will try my very best to answer as many as possible.
i own an octavia vrs 2.0 tfsi 2006 model so its a vw as you all no,my problem is the car is running ruff epc light and traction light on no engine light,car will hardley rev just like lip mode.but cant drive it as its like its running on 3 cylinders,i have some fault codes so can any one shed any light on what the problem is before i start spending on parts i dont need.thanks for any help
ReplyDeletehttps://gyazo.com/3234f5af019501aa6572470eebac42ef
i own an octavia vrs 2.0 tfsi 2006 model so its a vw as you all no,my problem is the car is running ruff epc light and traction light on no engine light,car will hardley rev just like lip mode.but cant drive it as its like its running on 3 cylinders,i have some fault codes so can any one shed any light on what the problem is before i start spending on parts i dont need.thanks for any help
ReplyDeletehttps://gyazo.com/3234f5af019501aa6572470eebac42ef
Based on the fault codes you present, basically eluded to the fact that the problem lies with an erratic voltage feed to the accelerator pedal sensors. Either the battery is low and the reference voltage is below the expected value, or the potentiometers on the accelerator pedal are at fault, either scratchy (dust inside) or the carbon tracks are worn through and has therefore reached end of life. Considering you vehicle is a 2006, it most likely has in excess of 200k on the clock and that's a lot of accelerator pedal movements.
DeleteBelow is a list of codes related to your problem. As can be seen there are 10 codes, five relating to G79 and five relating to G185. The first of each presents an electrical problem. The second of each presents and implausible signal, implying the ECU doesn't know what to make of the signal. The third of each presents a signal that's lower than expected hence the ecu switches to a different mode (limp mode) because it cannot use the low signal. The fourth of each is the opposite of the third and the fifth signal is intermittent, implying the signal is present then not, so once again the ECU is stumped and goes into an alternative mode. It is most likely that your accelerator pedal needs replacement.
1) P0220 Throttle / Accelerator pedal position sensor 2 (G188) lectrical circuit voltage Supply malfunction
2) P0221 Angle Sensor 2 for Throttle valve drive (G188) implausible signal
3) P0222 Angle sensor 2 for throttle valve drive (G188) signal too small or too low
4) P0223 Angle Sensor 2 for Throttle (G188), signal too high or too large
5) P0224 Angle sensor 2 for throttle valve drive (G188) circuit Intermittent
1) P0225 Throttle pedal position sensor (G79) electrical circuit voltage supply malfunction
2) P0226 Sendors 1 and 2 for accelerator pedal position (G79) + (G185) implausible signal
3) P0227 Sendor 1 for accelerator pedal position (G79) signal too small or too low
4) P0228 Sendor 1 for accelerator pedal position (G79) signal too large or too high
5) P0229 Throttle / accelerator pedal position sensor (G79) circuit Intermittent
Hi i have a vw polo 2003 1.0 L when i turn on the ac somebtimes epc light comes on and the car struggles to rev i checked the throttle boddy it hardly opens if full pedal push . Sometimes this happens when im in traffic jam .i dont know what to do and dont have vag cuse im in Egypt >.<
ReplyDeleteSalaam Muhammad Albanaa
ReplyDeleteIt seems likely that you battery isn't charging properly or else the battery is at the end of its life. When you turn on the AC, the 12V in insufficiently stable and the reference voltage for the EPC circuit is thus affected which causes the EPC circuit/light to come on. Check the sulfuric acid/water level in your battery, it may low hence you have reference voltage issues. However, when the car goes into limp mode, it automatically shuts off the AC. Regarding the throttle body, it is electronically controlled so when you floor the accelerator pedal the EPC circuit restricts the butterfly from opening. When the problem is fixed you should manage to get WOT.
Thx for your help i will check it and answer you
ReplyDeleteStill epc light comes on but when the car is idle for like 5 mins . I forgot to mention that when i turn off the car and start it again the problem goes away and sometimes comes on agai
ReplyDeleteBear in mind that when you turn on the ignition before starting the car, the EPC light should come on for at least 3 seconds whilst the ECU is doing it diagnostic test then it should switch off. This is normal and expected. If the EPC comes on while driving and he car goes into limp mode it would be worth your while to spray some Wynn's Air Intake and Carburetor Cleaner (http://www.wynns.eu/product/air-intake-and-carburetor-cleaner/) into your throttle body. Also Unplug the 6 pin plug on the accelerator pedal and spray both the male and female plugs with electrical contact spray 9http://www.wd40specialist.com/products/contact-cleaner), the label must say electrical contact. Hopefully that should sort out your problem because I don't think you have any components that has gone fault. I assume it's just a poor contact or carbon buildup in the throttle body.
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ReplyDeleteHi, I have a similar EPC problem with my VW polo 1.2 highline. Car goes in limp mode when the EPC symbol shows in dash board and max speed achievable is 10-15 km / hour. VW service person is asking for replacement of throttle body which costs around 30K. I am in a confusion whether to spend 30K or look for advice from another Vw service station. I have driven my car for 31K and it is a 5 year old car. Please suggest.
ReplyDeleteHi Ajit Patra
DeleteIf your VW service center diagnosed that it's your throttle body, based on a DTC from your car, then it very likely is the throttle body that's causing the fault. However, it doesn't mean replacement will cure the problem because there are several faults that can cause the EPC light to come an and cause the car to go into limp mode. They may have erred in their diagnoses and will charge you for something that's not faulty. There are loads of VW owners who can bear testimony to their throttle bodies being replaced, only for the EPC fault returns a few days later. I suggest you try cleaning out your throttle body with Wynn's Air Intake and Carburetor Cleaner before you send your car for repairs to anyone. Just be careful not to break the thin wire inside your MAF. Perhaps your throttle body just needs its adaptation to be redone. Try to have your car scanned then post the results on this site then it would be easier to guide you in the right direction.
https://www.wynns.eu/product/air-intake-and-carburettor-cleaner/
I am in same exact situation now seeing the malfunction light on and the service guys said it's because of throttle valve during my 4th year service done this week.But they said that I can continue to use as long as it's not giving any issue to drive. Is that okay to continue driving with the malfunction light on for the throttle issue. I think this light could be showing up for so long and I am not aware of this light purpose and I did not face any issues. Your suggestions would help me. Thanks
DeleteGood morning all,
ReplyDeleteI keep getting a code on my 03 Audi A4 1.8T it refers to evap canister issues. Ive got a VAG scanner that i erase the code with and car runs good for a little while then code pops back up. Now I did the readiness test and these things have popped up EGR System fail #1 O2 sensor fail #2 A/C system fail #3 Evap system Fail #4 and finally #5 Catalyst Fail!! Ive replaced injectors including wiring, O2 sensors 1 only a list of other items and still no idea what else that I should do. Don't want just anyone to tinker with my car and don't necessarily want to be taken advantage of by dealerships. Nomore time or patience with the guessing game that is quite expensive. Any help would be greatly appreciated. Thanks in advance
18041 P1633 Skoda loura
ReplyDeleteHello i have skoda octavia 2004 model.from few weeks it shows EPC light and my accelerator doesn't work. My car goes into limp mode. starting my car after couple hours it works properly but it happens again and again... I scanned my car it shows.
ReplyDelete1) P1171 : angle sensor 2 for throttle actuator (G188) implausible signal.
2) P1542: angle sensor 1 for throttle actuator (G187) implausible signal.
What does it mean. What should i do.
PLEASE HELP ME.
Hi there
ReplyDeleteI am driving a Polo Vivo 1.6 2016 model, the problem is there is every morning when i start the car the EPC light comes out and the car keeps a reving sound and when it does that it losses power. What could the problem be.
Nice blog post, Thanks for sharing!!!
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ReplyDeletei am driving a polo tsi 1.2 trendline 2015 my problem is when i start my car the epc light comes out and my car is not starting and on dashboard comes a massage says press clutch and at that time i press clutch nathing happen
what could the problem be?
Did u guys manage to sort our issues regarding the pedal sensor and throttle and throttle sensor
ReplyDeleteHi one afternoon I took the car to the mechanic to check on reverse switch/light suddenly after we didn't find anything when I took off the car no power...no throttle response please help....VW polo classic 1.4 2006 model
ReplyDelete