Circuit/System Verification

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.

Ignition » On / Vehicle » In Service Mode
Verify DTC P0641, P0651 is not set.
- If the DTC is set
  Refer to:Diagnostic Trouble Code (DTC) List - Vehicle
- If the DTC is not set
Engine»Running
Verify DTC P0336 is not set.
- If the DTC is set
  Refer to: Circuit/System Testing
- If the DTC is not set
Verify the scan tool parameter:Crankshaft Position Active Counter =Increments
- If the parameter value does not increment
  Refer to: Circuit/System Testing
- If the parameter value increments
Verify the scan tool parameter:Crankshaft Position Resync Counter = 0 Counts - The engine should not stumble/stall.
- Perform the action while monitoring the parameter:
- Wiggle the harness and connector:B26 Crankshaft Position Sensor
- Wiggle the harness and connector:K20 Engine Control Module
- If greater than 0 counts
  Repair as necessary » Wiring / Terminal(s) / Electrical Connector(s)
- If 0 counts
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Verify the DTC does not set.
- If the DTC sets
  Refer to: Circuit/System Testing
- If the DTC is not set
All OK.