What does this mean when the EPC light stays on?
Epc means electronic power control and typically the throttle body is bad
One of your wheel speed sensors is bad
SOURCE: 2004 vw jetta. epc light came on, what dose this
USUALLY it means you have a bad or loose gas cap.
SOURCE: my MIL light came on and is staying on. what can
The MIL or malfunction indicator lamp illuminates when the On board diagnostics has detected a problem with you vehicles emissions system, most times it is either a loose or faulty gas cap, but to know for sure you will need to do what the first person said and have the code read by a computer.
I’m happy to assist further over the phone at https://www.6ya.com/expert/gregg_78ecbb34e27be215
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.
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