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Author Topic: Epc light on engine misfire  (Read 21987 times)

Offline Saha

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Epc light on engine misfire
« on: 15 January 2014, 19:10 »
Hello
Whilst coming home from work this evening there was a serious accident I was stuck in traffic for about 45 minutes I left the engine idling whilst in the traffic jam then I noticed the engine note changed and the epc light came on the engine had a misfire I turned the engine off and restarted the engine the epc light went out and the engine ran fine anybody else had this.Thanks.
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Offline noobmonkey

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Re: Epc light on engine misfire
« Reply #1 on: 15 January 2014, 21:16 »
did anyone else read that as "EPIC"? :P - oh i so want an EPIC light! :P :)

(p.s. eeeek - doesn't sound fun with an EPC light!
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Offline KyleB

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Re: Epc light on engine misfire
« Reply #2 on: 15 January 2014, 21:22 »
With an engine light coming on it might be worth booking it in for VW to have a look at. Light might of disappeared but could still be a fault code logged.
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Offline FNJ-GTI

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Re: Epc light on engine misfire
« Reply #3 on: 16 January 2014, 08:58 »
Ive had this. was driving on the motorway and all of a sudden the car felt like it lost a bit of power and the yellow EPC light came up in the rev counter. Finished my journey and when I went to restart the car it was gone, not had it back since (been about 2 weeks and 400 odd miles).

I spoke to my sales dealer guy who said I could book it in if I wanted, but I haven't yet as not had the time, and the fact that it hasn't happened again makes me think it was just a random one off ? Do you guys think I should have them take a look ? could it be a potential damage problem ?
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Offline Saha

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Re: Epc light on engine misfire
« Reply #4 on: 21 January 2014, 20:13 »
Hello
 Dealer contacted about the epc Light on nothing they can do unless the light is on all the time.

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Offline ajmoir36

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Re: Epc light on engine misfire
« Reply #5 on: 21 January 2014, 20:17 »
Quote from: Saha on 21 January 2014, 20:13
Hello
 Dealer contacted about the epc Light on nothing they can do unless the light is on all the time.

What pish, it will be logged.
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Offline corgi

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Re: Epc light on engine misfire
« Reply #6 on: 22 January 2014, 11:34 »
Quote from: FNJ-GTI on 16 January 2014, 08:58
Ive had this. was driving on the motorway and all of a sudden the car felt like it lost a bit of power and the yellow EPC light came up in the rev counter. Finished my journey and when I went to restart the car it was gone, not had it back since (been about 2 weeks and 400 odd miles).

I spoke to my sales dealer guy who said I could book it in if I wanted, but I haven't yet as not had the time, and the fact that it hasn't happened again makes me think it was just a random one off ? Do you guys think I should have them take a look ? could it be a potential damage problem ?

So, if it hasn't come back it could well just have been a transient bad signal from one of the sensors... these can be caused by all sorts of things.

The other statement is correct - ajmoir36 - that the fault will be logged in the ECU until cleared (either using software or disconnecting the battery for a few minutes)... if it were me, and the light has reset, I would leave it and keep an eye for its return. If you have another EPC light in the next week or two then I would be seeking an investigation.
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Offline kevinm

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Re: Epc light on engine misfire
« Reply #7 on: 22 January 2014, 12:58 »
Mine did the same thing the other night while I was sitting in it with vag com. It was idleing for over an hour. When ever the cooling fan kicked in, it would drop a cylinder. It would just stop firing all together. It was way more severe than just a mis fire.

Once the fan turned off, the cylinder would run again. It wouldnt through an epc light unless I revved it. There are 2 faults logged in the ecu, one for cylinder 4 miss-fire and another to do with cylinder activation.

I havnt booked it in to be checked yet. The fans wouldnt be used much this time of year anyway. I couldnt find a way to turn on the fans with vcds (output tests) so the only way to replicate it is to let her get hot enough to turn on the fan.
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Offline FNJ-GTI

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Re: Epc light on engine misfire
« Reply #8 on: 23 January 2014, 09:11 »
Quote from: corgi on 22 January 2014, 11:34
Quote from: FNJ-GTI on 16 January 2014, 08:58
Ive had this. was driving on the motorway and all of a sudden the car felt like it lost a bit of power and the yellow EPC light came up in the rev counter. Finished my journey and when I went to restart the car it was gone, not had it back since (been about 2 weeks and 400 odd miles).

I spoke to my sales dealer guy who said I could book it in if I wanted, but I haven't yet as not had the time, and the fact that it hasn't happened again makes me think it was just a random one off ? Do you guys think I should have them take a look ? could it be a potential damage problem ?



So, if it hasn't come back it could well just have been a transient bad signal from one of the sensors... these can be caused by all sorts of things.

The other statement is correct - ajmoir36 - that the fault will be logged in the ECU until cleared (either using software or disconnecting the battery for a few minutes)... if it were me, and the light has reset, I would leave it and keep an eye for its return. If you have another EPC light in the next week or two then I would be seeking an investigation.

Cheers for the advice, haven't had the warning light back yet and its been quite a long time, car seems fine with no issues so im happy to treat it as a one off sensor error.
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Offline kevinm

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Re: Epc light on engine misfire
« Reply #9 on: 23 January 2014, 23:57 »
I had mine checked by the dealers today. They could not replicate the fault so just cleared fault codes. I havnt had the fault either since the first night. Here are the fault codes for reference:

Wednesday,22,January,2014,21:33:30:64864
VCDS Version: Release 12.12.0 (x64)

                Address 01: Engine       Labels: 06K-907-425-V1.clb
Control Module Part Number: 5G0 906 259     HW: 06K 907 425 B
  Component and/or Version: 2.0l R4 TFSI  H13 0007
           Software Coding: 091D00124464050B3000
            Work Shop Code: WSC 01357 011 00200
              ASAM Dataset: EV_ECM20TFS0215G0906259 001011 (VW37)
                      VCID: EBDEBCD102781046D11-80BE
2 Faults Found:

15074 - Cylinder Disabling
          P130A 00 [096] - -
          Intermittent - Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 881 km
                    Date: 2014.01.17
                    Time: 20:30:29

15134 - Cylinder 4
          P0304 00 [096] - Misfire Detected
          Intermittent - Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 2
                    Mileage: 881 km
                    Date: 2014.01.17
                    Time: 20:30:28


Readiness: 0000 0000
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