Circuit/System Verification
WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
- Verify that no hybrid powertrain control module (HPCM) DTCs are set due to high battery voltage.
- If the specified DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Engine running, observe the scan tool ACCM High Battery Voltage parameter. The reading should be between 225 Volts and 380 Volts.
- If greater than the specified range, replace the ACCM.