Advanced Diagnostics

Advanced Diagnostics - DTC P0A3C (39): Motor Control Module (MCM) Overheating






General Description
The motor control processor receives the voltage 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. When the temperature rises, the cooling system fan is turned on, or the motor torque is reduced to cool the MPI module and to restrain the temperature rise of the MPI module and the motor control module (MCM). When the motor control processor temperature is 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 1.0 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 setting the DTC
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM and the MCM memory.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.