Swampfox21
New member
2008 Envoy SLT.. 6 cyl. Parked the car after coming home from work and the next morning it was totally dead. No dome lights or dash lights. Once I put the key in the ignition I could not remove it.
Battery was a 2012 and I replaced it thinking a 7 year old battery was the issue and at first it didn't want to take a charge. All seemed well for the rest of the day.
Next morning I went out to the car and same issue. Battery was stone cold dead. Was able to charge the battery and get the vehicle started.
Decided to run a scan and had a P2431 code that pointed to the A.I.R. system.
I shut the car off and as I exited I heard a small motor running that was not audible from inside the car. Disconnecting the battery stopped the motor, reconnecting it and the motor was off. After about 5 min. I heard the motor start up again. I was not touching the car , was cleaning up. then the motor seemed to go through different speed modes, something it is not supposed to do.. I thought "Is this car possessed"?
Was the A.I.R. pump motor located under the car on the frame rail under the drivers seat. Further investigation suggested a bad relay (Located next to the motor on the rail) or an issue with the wiring or the computer. The relay is energized by a ground signal from the computer.
I replaced the relay ($40.00) and the problem seems to be resolved.
Will Keep you posted if it does not work.
24 Hours later Battery still charged, drove the car around a bit, No blower motor running when I shut the car off... No codes available.. Seems the relay fixed the issue.
Foot Note: QUESTION: The wiring is designed so the motor has power always energized. It is controlled by grounding the relay, a signal from the computer, Can anyone logically explain to me how the motor could run at variable speeds???... I can understand a relay being intermittent but not make a motor run at half speed.
Battery was a 2012 and I replaced it thinking a 7 year old battery was the issue and at first it didn't want to take a charge. All seemed well for the rest of the day.
Next morning I went out to the car and same issue. Battery was stone cold dead. Was able to charge the battery and get the vehicle started.
Decided to run a scan and had a P2431 code that pointed to the A.I.R. system.
I shut the car off and as I exited I heard a small motor running that was not audible from inside the car. Disconnecting the battery stopped the motor, reconnecting it and the motor was off. After about 5 min. I heard the motor start up again. I was not touching the car , was cleaning up. then the motor seemed to go through different speed modes, something it is not supposed to do.. I thought "Is this car possessed"?
Was the A.I.R. pump motor located under the car on the frame rail under the drivers seat. Further investigation suggested a bad relay (Located next to the motor on the rail) or an issue with the wiring or the computer. The relay is energized by a ground signal from the computer.
I replaced the relay ($40.00) and the problem seems to be resolved.
Will Keep you posted if it does not work.
24 Hours later Battery still charged, drove the car around a bit, No blower motor running when I shut the car off... No codes available.. Seems the relay fixed the issue.
Foot Note: QUESTION: The wiring is designed so the motor has power always energized. It is controlled by grounding the relay, a signal from the computer, Can anyone logically explain to me how the motor could run at variable speeds???... I can understand a relay being intermittent but not make a motor run at half speed.
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