What is a GMC PCM?

What is a GMC PCM?

The powertrain control module (PCM) in General Motors vehicles is the main computer responsible for controlling most of the vehicle’s computerized components including the engine, transmission and drivetrain.

Where is the PCM located on a 2002 GMC Envoy?

The 2002 GMC Envoy is usually located in the engine bay on the driver side, on the firewall or near the battery.

What causes PCM to fail?

PCMs typically fail for one of two reasons: voltage overloads (often due to a short in a solenoid or actuator circuit) or environmental factors (corrosion, thermal stress or vibration). Thermal stress and vibration can form microcracks in circuit boards (which are repairable).

How do you reset the PCM on a 2002 Envoy?

How to Reset a Computer in a 2002 GMC Envoy

1. Park and turn off the vehicle’s ignition.
2. Turn on the vehicle’s headlight switch inside the vehicle’s passenger compartment.
3. Connect the negative battery cable with an adjustable wrench.
4. Drive the vehicle for at least 30 minutes to allow the computer time to reset.

What causes a PCM to fail?

https://www.youtube.com/watch?v=yg1zcIfkUJY