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Home › Cadillac › 2012 › Escalade EXT › Repair and Diagnosis › External Pages › Different car › Section 1220 (Hybrid Engine Control System) › Diagnostic Information and Procedures › DTC P1B0F or P1B10 › Circuit/System Testing

Circuit/System Testing

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.
  1. Inspect for DTCs P0A40, P0A45, P0A46, P0A78, P0A79, P0A3F, P0C05, P0C08, P0C0B, P0C0E, P0C4E, P0C4F, P0C52, P0C53, P0C57, P0C58, P0C61, P0C62, P0C5C, P0C5D, P1B03, P1B04 or P1B0D.
    • If any of the above DTCs are set, diagnose and repair them prior to performing this diagnostic.
  2. Ignition ON, engine OFF. Observe the HPCM 300V Circuit parameter. The hybrid battery voltage should be greater than 192V.
    • If the hybrid battery voltage is less than 192V perform the Jump Assist procedure and attempt to successfully charge the hybrid battery. Re-test for this DTC after the Jump Assist procedure is complete. Refer to Jump Assist .
  3. Turn the ignition OFF and wait 2 minutes.
  4. Ignition ON, monitor DTC Status. DTC P1B10 and P1B0F should have passed last test.
    • If DTC P0C4E or P0C4F sets, proceed to that diagnostic procedure.
    • If DTC P1B10 and P1B0F have passed, clear DTC Information. No further diagnosis is necessary.
    • If DTC P1B10 or P1B0F resets, program the PIM with the latest software version and recheck for DTCs. If the DTC resets after programming or if the PIM already contains the latest software version, replace the drive motor generator assembly.
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