Car was running at a high idle around 1500-3000 rpms sometimes would shift weird. sometimes would stall when parking, started to run rough when i pulled into lot and seemed that didnt respond when pressed gas. pulled it in and shut it off. now when i try and start it it will try to start but sounds rough and wont fire up
Error codes P0122,0440, 1404, 1635,0107... rolls over but wont stay running on 2000 Pontiac Bonneville
by pawson31 in Mount Pleasant, MI on November 21, 2013
ANSWER by cardocIII , November 22, 2013
When I see that many codes I often wonder if someone started unplugging things to see if it would make a difference. The next step is pick one and see what you find. A P0122 is throttle position sensor signal low, possible causes are a loss of the reference voltage to the sensor, or a grounded signal wire. Do you have a scan tool that will let you see the data that the PCM is seeing? If the voltage shows low in the data, now go out to the sensor and use a voltmeter to see if it measures the same out there as the scan data shows. Then see if the 5v reference is there. There could be a common cause for a number of these codes, something "shorting" and pulling the 5v reference down could easily do it. You might need a technician to sort through this for you.