Advanced Diagnostics

DTC P0A3C (39): Motor Control Module (MCM) Overheating




General Description
The motor control processor obtains the voltage change value of the motor power inverter (MPI) module internal temperature from the motor control subprocessor through serial communication, and the processor uses this value to protect and control temperature rise in the MPI module. The motor control module (MCM) internal temperature is also estimated using the MPI module internal temperature. When the temperature rises, the cooling system a fan or the motor torque is controlled to cool the MPI module and to restrain the temperature rise of the MPI module and the MCM.

When the motor control processor temperature is indicated at a set temperature or more for a specified time, overheating of the MCM is detected and a DTC is stored.




Monitor Execution, Sequence, Duration, DTC Type, OBD Status




Enable Conditions

Malfunction Threshold
One of these conditions occurs for at least 1 second.
- The MPI module temperature is 230 °F (110 °C) or more.
- The MCM internal temperature is 257 °F (125 °C) or more.

Diagnosis Details

Conditions for illuminating the MIL
When a malfunction is detected, the MIL comes on and the DTC and the freeze frame data are stored in the PCM and MCM memory.

Conditions for clearing the MIL
The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the diagnostic runs.

The MIL, the DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by disconnecting the battery.