Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hello, my name is Bobby. Thank you for the question. Can you tell me how the vehicle is running besides the light being on?
Thank you. Does it run like this every time you try to drive it or is it intermittent?
Thank you. It does sound like a BCM issue. This is common especially after a voltage failure. If you have a voltage meter we can run through some test before replacing this.
Great. That will help I also forgot to ask if your code reader also reads live engine data?
Don't worry about that right now. The first thing I need you to do is unplug the connection at the throttle body and turn the key on and tell me which wires have voltage. I would then reconnect it and do the same at the throttle pedal under the dash.
It looks like you did the test right, but you need to have it set on the 10v scale if it has one. The key needs to be on also.
Thanks. Set it to 20 and retest.
From those readings it looks like it is a bad switch.
Sorry. One more test just to verify the throttle body operation. If you place your meter between the brown wire and the yellow wire and then turn the key on and move the accelerator pedal do you get a voltage reading?
Let me clarify. Unplug the connector. Place one probe on one of the terminals and the other on the other terminal and tell me what the voltage reading is.
The fact that you are not getting any voltage there tells me that the PCM is not trying to operate the throttle body. If your scan tool has the capability then you need to see if you have a reading from the accelerator pedal position sensor.