Circuit/System Verification

Inspect for ECM P0335 or ECM P0336. With the engine running, observe the hybrid powertrain control module (HPCM) 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 ECM DTCs P0335 or P0336 are set, diagnose them prior to diagnosing the HPCM DTC.
• If the HPCM Engine Speed parameter displays a value other than the current engine speed, continue with Circuit/System Testing.