Circuit/System Verification

WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.

Verify that DTC P1AE7 is not set.
- If the DTC is set, refer to DTC P1AE6 or P1AE7 .
Verify that DTCs P0A78, P0A79, P0BFD, P0BFE, P0C01, or P0C04 is not set.
- If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
Ignition ON, engine OFF, observe the scan tool battery energy control module contactor system status parameter. The status should display closed.
- If not the specified value, refer to Symptoms - Hybrid Controls .
Hood closed, transmission in park, and Ignition OFF for at least 2 minutes.
Ignition ON, engine OFF, within 5 seconds of ignition ON, observe the hybrid powertrain control module 300V Circuit parameter and compare it to both data parameters listed below. Each motor parameter should be within 20 V of the hybrid powertrain control module 300 V circuit parameter.
- Motor 1 Isolation Voltage
- Motor 2 Isolation Voltage
- If only one Motor Isolation Voltage value is not within the specified range, replace the drive motor generator power inverter control module.
- If both Motor Isolation Voltage values are not within the specified range, refer to DC Circuit Testing in Circuit/System Testing.
If both Motor Isolation Voltage values are within the indicated range, a loss of isolation condition is not currently present, refer to AC Circuit Testing in Circuit/System Testing.