Help! Alero 2002 Shifting Hard and IAT Error

Help! :crying:

My Alero is shifting hard and the check engine light is on.

The code informs replace the IAT. I have replaced the sensor 2x to be sure I did have a bad one.

I took the car to a trans repair shop last Sat and they told me that I have to correct the sensor issue first.

The IAT stays at a -38

How do you check the if it is getting voltage? Has any one had this issue.
Broken wire???

Please help the car goes in the shop tomorrow!

GM has a TSB out on this issue and I recall it recommends repairing damaged wiring at the IAT electrical connector or replacing the connector. The PCM module supplies a 5 volt dc reference signal to the input and the output back to the PCM module varies since the IAT is a thermistor based on air intake temperature.

Also, you may have to reset the PCM module to clear the existing IAT DTC causing the SES/CEL light or it may clear after a few drive cycles on its own.

Thanks for the info! I went to a GM dealer and bought a new plug pig tail, cut off the old plug and crimped on the new one. The car is running like a champ now! It is amazing that one little sensor could make the tranny shift hard like that. Damn that air intake sensor! Ha! Thanks again! You are the mutts nutz! :biggrin: