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2001 Volkswagen Jetta EPC light

Tiny
JENNS
  • MEMBER
  • 2001 VOLKSWAGEN JETTA
  • 2.0L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 101,000 MILES
For the last 3 years the EPC light has been coming in in my car. Ive had it to the dealer to have it fixed and yet it still comes on. They replaced the computer, and repaired the recalls. I had the throttle body replaced, vacuum lines replaced as well. It will still lose power and go between 2-5 mph, buck, and shut off. Im at a loss as to what it can be, any suggestions?
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Tuesday, November 26th, 2013 AT 7:20 AM

10 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Does the car ever run properly? Has fuel pump pressure been checked?
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Tuesday, November 26th, 2013 AT 7:55 AM
Tiny
JENNS
  • MEMBER
  • 6 POSTS
It does for a time and then the light comes on and I'm back in the same position. The dealership claimed it was checked and was fine.
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Tuesday, November 26th, 2013 AT 8:14 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
By any chance, have they given you the trouble codes they got when scanning the computer?
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Tuesday, November 26th, 2013 AT 8:43 AM
Tiny
JENNS
  • MEMBER
  • 6 POSTS
The main code that comes up is the mass air flow sensor, when I tried to have it replaced the car refused to start. But it did start when it was disconnected.
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Tuesday, November 26th, 2013 AT 8:52 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Is it possible that you got a bad one?
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Tuesday, November 26th, 2013 AT 9:07 AM
Tiny
JENNS
  • MEMBER
  • 6 POSTS
It could be possible
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Tuesday, November 26th, 2013 AT 9:13 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
The idea that it didn't run at all makes me thing that you may have gotten a bad one. When you disconnect it, the computer will run the vehicle in a closed loop setting.
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Tuesday, November 26th, 2013 AT 9:29 AM
Tiny
JENNS
  • MEMBER
  • 6 POSTS
With the car doing that is why I was baffled. I have researched online for answers about the issues and everything I found says get rid of it. If I get a new mass air flow sensor and part, but that's not the issue, any ideas as to where to start next?
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Tuesday, November 26th, 2013 AT 10:53 AM
Tiny
EXOVCDS
  • MECHANIC
  • 1,883 POSTS
MAF codes can set due to the poor running / stalling issue. So the MAF might not even be the issue.

I have had two vehicles in the last couple of months with EPC light / stalling / starting issues. Both were solved by replacing the ECM power supply relay.

Replacing parts isn't the way to go. Have someone monitor ECM data blocks while the engine is running poorly, until the reason is determined.

Thomas
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Wednesday, November 27th, 2013 AT 6:08 PM
Tiny
JENNS
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Thank you I will try that.
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Wednesday, November 27th, 2013 AT 6:54 PM

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