The crankshaft position sensor, ignition module, and/or powertrain control module (PCM) may fail resulting in illumination of the Check Engine Light with ignition system related fault codes stored in the PCM. Patience is necessary when dealing with this specific situation as normal diagnostic procedures are not effective. In many cases, the best option is to replace parts, one at a time until the fault is corrected.
Crankshaft Position Sensor, Ignition/Powertrain Control Module May Fail on Pontiac Grand Prix
Average mileage: 161,750 (98,000–260,000)
Exhaust & Emissions affected: 3.8L V6
10 people reported this problem
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something is shorting out my battery and prventing my car not to start and im not sure what the exact problem is. I had a mechanic to look at it and it printed of a p400 code?