08 model reduced engine power/general electrical issues

Asked by Jun 21, 2014 at 11:09 AM about the 2008 Pontiac Grand Prix Base

Question type: Maintenance & Repair

I've been getting the reduced engine power message for a while now randomly the car
will actually choke down and stall out when i come to a stop sometimes. It is usually
the worst when the car sits in the sun all day other times it will drive fine. I had it
scanned and it came back with P2120 and P2138 which is apparently a voltage issue
with the Accelerator Pedal Position Sensor.  I've also been having other random
electrical issues though one of the headlight connectors burnt out a few months ago
and the door locks will randomly cycle and pop the trunk when i turn the car on
sometimes, the clock and date reset randomly as well. Anyone else had these issues
im wondering if i need to replace the accelerator pedal assembly or if its another
electrical issue.

3 Answers


Sound,s to me like you have,bad ground issue,it is causing lot,s of eletrical issue,s.Before i replaced any thing,you need to find the short,it has to be a ground wire.I think you may start close to where you said head light harness burnt up.

my wifes car is doin same thing an wot crank sometimes

my car is having issue as well replace a cracked coil ,that was getting hot after is suddenly wouldn't start the other day . The new coil got so hot on the 3 try to start it , it cracked right away . can't figure out what the issue is

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