Advanced Diagnostics

Advanced Diagnostics - DTC P0AE1 (62): Bypass Contactor Malfunction






General Description
The high voltage contactor between the battery module and the motor power inverter (MPI) module is turned on to activate the integrated motor assist (IMA) system after turning the ignition switch to ON (II). Before turning the high voltage contactor on, the bypass contactor is turned on, and the PDU capacitor is charged gradually by current limited by the bypass resistor. When the difference between the voltage on the MPI module side and the battery module side is within a set range, the high voltage contactor is turned on, then the bypass contactor is turned off. If the difference between the voltage on the MPI module side and the battery module side is out of a set range for a specified time after the bypass contactor is turned on, a malfunction is detected and a DTC is stored.

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






Enable Conditions






Malfunction Threshold
The difference between the voltage on the MPI module side and the battery module side is more than 8.01 V for at least 210 milliseconds after the bypass contactor is turned on.

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.