Question about 2004 Volkswagen Passat

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Hi. I have a 2004 vw passat 4motion automatic sedan. last night my epc light came on........i experienced a down shift in power but was still able to drive. This morning i was able to start no problem

Is it safe to be driving?

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1 Answer

I would stop using the car

With VW/Audi there may be shops that work
on them, but you need scan tools specific to
that make

Non of my domestic or asian venders even offer that

So your best bet is a VW Dealer, so they can scan the vehicle
for the problem

When the powertrain features effect the transmission, you can
ruin a trans in ten miles of driving So Don't Use It like that

You can Google EPC which I did, but I can not spend a long
time to learn Euro Technology & the fix, when I don't see those
vehicles

We have a friend that has a VW & last Nov 2013 the car spent
5 weeks at a dealer, they had to contact Germany, as they had no
idea how to program an ABS Module,all because a switch that was on the outside for a decade & replaced by the vehicle owners,
was no inside & your done

In the British Isles & other parts of Europe, they take that in stride
& don't get up set or have the issues we have in North America

Posted on Nov 26, 2014

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Posted on Sep 12, 2009

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SOURCE: 2003 Volkswagon Passat. The epc light comes on

EPC refers to the drive by wire system. This system, generally speaking, encompasses the throttle pedal and its position sensors (it needs to know where your gassin' foot is) and the throttle body.

Most likely, the EPC light and its associated faults for this scenario are a symptom, not the problem. Meaning the actual root cause is causing the no-start/no crank issue AND fault codes related to the EPC system.

And the most likely root cause is an ignition switch, NOT the engine speed sensor.

With a bad engine speed sensor, the car will still crank all damn day (or until the battery dies) but the car won't start.

If you get a no-crank issue, and then it eventually starts either with or without an EPC light, again, the most likely problem is the ignition switch. Not the starter, not the battery (though the battery proper and the cable connections must be perfection itself to rule them out.) You can get these issues with a visually perfect but still faulty battery connection.

Posted on Jun 16, 2010

  • 45 Answers

SOURCE: 2002 vw passat- EPC light came on when starting

The EPC light means the car is running in "Limp Mode". I had the same thing happen to my car (2001.5 Passat GLS) and i chased the problem for three months.... I would drive and begin to get on the interstate only to have complete loss of power and inability to accelerate. Id pull over, turn off the car then crank it right back up and it was fine. But it came back again randomly. I would suggest pulling codes with a scanner. If you do not have one most local auto parts stores will scan them for free. Mine turned out to be a sensor that is right on top of the engine in the front.... If I'm not mistaken it's the engine speed sensor, also called crank sensor or impulse sensor. You may also want to do a throttle body cleaning.... That would be beneficial no matter what.use extreme care when doing any TB stuff, though, as it's very sensitive. I doubt you want to be forced to get a new one for ~650$. I'd also suggest getting the Bentley Manual for the car as its VERY handy! Http://tech.bentleypublishers.com/thread.jspa?threadID=35463 (there's a link at the bottom to get it.... I really suggest it, as this car is very high maintenance!!!!!!!)

Posted on Mar 29, 2012

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