won't start and when I parked it the epc light came on

2001 VOLKSWAGEN JETTA

152,765 MILES • 2.0L • 4 CYL • FWD • AUTOMATIC

CODYCOBURN

MEMBER
1 POST

My vw jetta won't start and when I parked it the epc light came on and my car only had half power. I'm trying to Get it running again. I hooked it up to a computer and it pulled the output speed sensor p0722, engine speed sensor p0725, and the throttle actuator p0638. I dnt know where to start or where these sensors are located. Any help would b greatly appreciated

Jul 27, 2014 at 4:43 AM

SQM

✓Experienced Mechanic
6,383 POSTS

Hello,

The no start issue could be caused by the throttle actuator.
One of most common cause of low power is a faulty throttle actuator. Sometimes when the throttle actuator components get dirty, they are unable to send accurate data to the ECM, in turns the ECM can reduce power or trigger a no start.

https://www.2carpros.com/articles/reduced-power-limp-mode

The throttle body can be serviced by cleaning it out.
Here is a helpful guide:

https://www.2carpros.com/articles/throttle-actuator-service

I have attached diagrams including location and testing procedures below.

Please let me know if you have any questions.
Thank you.

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