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 P0010, P0335, P0336, P0340, P0341 is not set.
- If any of the DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step : If none of the DTCs are set
Engine - Idling - At normal operating temperature.
Verify DTC P0016 is not set.
- If the DTC is set
1. Ignition/Vehicle - Off
2. Verify the following conditions do not exist :
  - B23 Camshaft Position Sensor - Incorrect installation
  - B26 Crankshaft Position Sensor - Incorrect installation
  - Q6 Camshaft Position Actuator Solenoid Valve - Incorrect installation/Stuck Closed/Stuck Open
  - Reluctor Ring - Misaligned @ Crankshaft
  - Timing Belt or Timing Chain - Excessive play
  - Timing Belt Tensioner or Timing Chain Tensioner - Incorrect installation
  - If a condition exists - Repair or replace as necessary
  - If none of the conditions exists - Refer to step 2.
- Go to next step : If the DTC is not set
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
  One of the above conditions still exist.
- Go to next step : If the DTC is not set
All OK.