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2005 Pontiac Grand Prix Base 4dr Sedan

2005 Pontiac Grand Prix
Trim Info:
Front Wheel Drive, 4 Door Sedan, Mid-Size
20 mpg city / 30 mpg hwy
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May 5, 2013, 10:00 am

Mike K

Question: Whats wrong with my car?

I have a 2004 grand prix with 126k miles on it and recently the charging system failure has come on the DIC along with check engine soon. I took it to both autozones, penzoil, and walmart plus a co worker of mine had done the test where you plug into the dash and no codes have been sent back. My co worker said that its giving diffrent voltage throughout everything and he dont know why. I have had the battery and alternator checked and both are good. Dont know what to do now please help?

May 10, 2013, 8:50 pm

Ron W
Expert Mechanic

Did you check the alternator for AC leakage? It may be a diode in it has failed and you are getting AC voltage leaking into the DC system. This can cause all kinds of odd problems.

If the Check Engine light is/was on, there is a code stored in history, and you may need a better scantool to access it. Sometimes the generic scantools miss stuff.

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