Here's and excerpt from a VW forum
"The EPC light means something is wrong in the drive-by-wire path, the "gas pedal" potentiometers or the electric motor-controlled throttle body, etc. I do not know if that relay qualifies, and I'm not even 100% sure what it does without research, but I assume it powers the ECM up when the ignition is on. Certainly the ECM is part of the electronic power control system, but I don't know if faults with the ECM are going to light the EPC light rather than the check-engine light."
It stands for Electronic Power Control.
There is a whole discussion about the EPC on this web site - May be of help.
http://www.passatworld.com/forums/showthread.php?t=208641
If your car is like mine you probably can't get a scan because the ec? won't communicate with the scan tool. My suggestion is to check the fuses and relays first then taka looke at the h?rness you are not getting constant power and that is setting false codes and making the car run great one minute and limp the next
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The EPC light gets input from a pressure sensor in the engine block. if the weather has been particularly hot, the pressure can be higher than normal in your engine. Therefore, take off the oil cap, check the oil, then put the cap back on. If you don't have a real problem, the light will go out.
SOURCE: epc light coming on on dashboard .what does it
This light means Electronic Power Control - The onboard computer has detected an issue with one of your electrical systems.
This
light comes on when the computer detects a
fault of some sort in its diagnostic tests. If it keeps detecting this
issue, the light will remain on. If the light turns off, then it has
detected that the issue may no longer be present.
In
order to find out what the exact reason was for your light, You need to
have your car computer scanned to retrieve the code that
the computer would have stored when the light triggered. Most garages
will do this free of charge. The code will tell you what may have
caused the light to initially go on
SOURCE: 2000 Beetle: Epc light came on I lost power what does that mean...
I was driving my 2002 vw beetle and the the car stop running. EPC light came on and the car will not start...What does this mean?
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