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Old 05-25-2018, 10:01 PM   #1
r_saurus
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EPC Light

My EPC Light came on last night driving home and then it felt like I lost a significant amount of power

This morning, and my whole drive in to work, the light was out

Thoughts?
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Old 05-26-2018, 08:39 AM   #2
mk7gti2.0
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Must of went into limp mode probably for a over boost fault. Do you have any mods?
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Old 05-26-2018, 11:31 AM   #3
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Quote:
Originally Posted by mk7gti2.0 View Post
Must of went into limp mode probably for a over boost fault. Do you have any mods?
Yes

Stage 1+ Unitronic, Stage 1 DSG, Milltek Downpipe/Catback, all the CTS turbo charge pipes, etc.

Is it a boost fault, is that something I need to go to a dealer for?
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Old 05-26-2018, 02:20 PM   #4
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EPC light usually has to do with the throttle. As a service advisor at a VW dealership, I notice throttle bodies being most common w/ EPC lights.
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Old 05-26-2018, 09:03 PM   #5
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Originally Posted by zfightmaster View Post
EPC light usually has to do with the throttle. As a service advisor at a VW dealership, I notice throttle bodies being most common w/ EPC lights.
So maybe related to CTS turbo throttle body pipe mod?

Since the light went out, and has stayed out for 48 hours, is that a good sign?

Or no, the fact that it came on at all is a major concern?
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Old 05-27-2018, 03:41 AM   #6
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Not major but finding the cause is important. Do you have access to coding software?
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Old 05-27-2018, 03:49 AM   #7
George Ab
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I had a bad coil/s resulting in excessive missfires leading to EPC light and limp mode. Turning car off would reset light.
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Old 05-27-2018, 12:11 PM   #8
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I had a bad coil/s resulting in excessive missfires leading to EPC light and limp mode. Turning car off would reset light.
So basically you're saying that event though the light went off does not mean that there is no-longer an issue?
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Old 05-27-2018, 12:12 PM   #9
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Originally Posted by Bäsemödel View Post
Not major but finding the cause is important. Do you have access to coding software?
Unfortunately not until Tuesday morning due to Memorial Day holiday
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Old 05-27-2018, 09:57 PM   #10
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Surprised no one said it but check the spark plugs. That was my issue
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Old 05-27-2018, 11:17 PM   #11
r_saurus
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Light has stayed out 48 hours, I had a friend do OBD scan and for ECU it said no fault codes

I do have RS3 coils & RS7 plugs
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Old 05-27-2018, 11:21 PM   #12
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Why are you running stage 1 tuning on stage 2 hardware. It would seem you could be moving more air/exhaust easier than the tuning expects at certain points? Usually it’s plugs or a coil but by your description it would seem to rule those out, I’d flash to stage 2 anyway you have the parts it seems.

Oh and most dealers will blame your mods and wash their hands of it as quickly as they can seeing as it’s only an intermittent issue, happened once, and hasn’t left a code.
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Old 05-28-2018, 03:33 PM   #13
r_saurus
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Originally Posted by KASPER View Post
Why are you running stage 1 tuning on stage 2 hardware. It would seem you could be moving more air/exhaust easier than the tuning expects at certain points? Usually it’s plugs or a coil but by your description it would seem to rule those out, I’d flash to stage 2 anyway you have the parts it seems.

Oh and most dealers will blame your mods and wash their hands of it as quickly as they can seeing as it’s only an intermittent issue, happened once, and hasn’t left a code.
I'm going Stage 2 on Saturday
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Old 06-03-2018, 02:22 PM   #14
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I upgraded from Stage 1+ & Stage 1 DSG to Stage 2 & Stage 2 DSG yesterday 6/2

VCDS indicated that the EPC 5/25 was from an over boost code

Thinking right now that Stage 2 hardware on Stage 1+ could have contributed to the EPC

Right now no issues - Thanks everyone
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Old 06-03-2018, 06:57 PM   #15
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Nice! Sounds like you ran into a condition where the the stage 1+ software didn’t like the better flowing down pipe. Now grab an intercooler and you’re all set, it never ends lol
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Old 06-04-2018, 06:38 PM   #16
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Originally Posted by KASPER View Post
Nice! Sounds like you ran into a condition where the the stage 1+ software didn’t like the better flowing down pipe. Now grab an intercooler and you’re all set, it never ends lol
Already have intercooler LOL
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