The drive motor generator power inverter control module (PIM) contains several microprocessors. This diagnostic applies to internal microprocessor integrity conditions within the hybrid powertrain control module (HPCM). The HPCM and each Motor Control Module (MCM) utilize a programmable logic device (PLD) to perform certain input and output functions. At ignition ON, the PLD expects to communicate with the HPCM and both MCMs. The PLD will communicate to MCM 1 over an internal communication circuit when it has established communications with the HPCM. MCM 1 will communicate to the engine control module (ECM) over GMLAN if the PLD has not established communication with the HPCM.

The control module has detected an internal HPCM malfunction.

DTC P0A1D is a Type A DTC.

DTC P0A1D is a Type A DTC.

An intermittent loss of battery power to the drive motor generator power inverter module assembly (PIM) may set this DTC.

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

1. Clear the DTC information.
2. Turn the ignition OFF for 1 minute.
3. Turn the ignition ON.
4. Retest for DTC P0A1D.

1. Inspect for any communication U-code DTCs.

⇒	If the specified DTCs are set, repair them first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle.

2. Ignition OFF, disconnect the 12V battery. Refer to Battery Negative Cable Disconnection and Connection.
3. Wait 2 minutes.
4. Reconnect the 12V battery. Refer to Battery Negative Cable Disconnection and Connection.
5. Ignition ON, retest for DTC P0A1D.

⇒	If the DTC 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 PIM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for PIM replacement, setup, and programming.