Advanced Diagnostics

Advanced Diagnostics - DTC P0A1B (84): Motor Control Module (MCM) Internal Circuit Malfunction






General Description
The motor control module internal communication is done by between the motor control processor and the battery control processor, and between the battery control processor and the high voltage control processor. When each control processor cannot receive the communication data for a specified duration, or received data is abnormal, a malfunction is detected and a DTC is stored. When the high voltage battery detection circuit is a specified voltage for a set time, a malfunction 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 0.5 second:
- Each control processor cannot receive the communication data, or received data is abnormal.
- The high voltage battery detection circuit voltage is 22.2 V or less.

Driving Pattern
1. Turn the ignition switch to LOCK (0), and wait 1 minute.
2. Turn the ignition switch to ON (II).

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 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.