Circuit/System Verification
WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
- Verify that DTCs P0335 or P0336 is not set.
- Engine running, observe the hybrid powertrain control module Engine Speed parameter with a scan tool. The parameter should display the current engine speed, matching the tachometer and/or the ECM Engine Speed parameter.
- If the hybrid powertrain control module Engine Speed parameter displays a value other than the current engine speed, continue with Circuit/System Testing.