Component Testing

WARNING: This page is about a different car, the 2021 GMC Sierra 3500 HD and 2021 GMC Sierra 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Ignition / Vehicle - Off
Disconnect the electrical connector: S3 Transmission Shift Lever
Connect a 3 A fused jumper wire between the test points: Control terminal 1 & 12 V
Momentarily connect a jumper wire between the test points: Ground terminal 2 & Ground
Verify the component produces a clicking sound: M7 Transmission Shift Lock Control Solenoid Actuator
- If the component does not produce a sound
  Replace the component: S3 Transmission Shift Lever
- Go to next step: If the component produces a sound
All OK.