Circuit/System Verification
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. 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
- Go to next step : If the DTC is not set
- Engine - Running
- Verify DTC P0336 is not set.
- If the DTC is set
Refer to Circuit/System Testing below
- Go to next step : If the DTC is not set
- If the DTC is set
- Verify the scan tool parameter : Crankshaft Position Active Counter = Increments
- If the parameter value does not increment
Refer to Circuit/System Testing below
- Go to next step : If the parameter value increments
- If the parameter value does not increment
- 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)
- Go to next step : 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 below
- Go to next step : If the DTC is not set
- If the DTC sets
- All OK.