Test F: DTC P0A27 - Hybrid Battery Power Off Circuit

PINPOINT TEST F: DTC P0A27 - HYBRID BATTERY POWER OFF CIRCUIT

F1:

F2:

F3 - F4:

F5 - F6:

Normal Operation

With the engine running the battery power off (BPO) function may be triggered by the front and/or rear inertia fuel shut off (IES) switches opening a high-voltage interlock circuit opening or the electrical interlock (EL I) circuit opening (fuse protected by the battery junction box [BIB] fuse 5 [5A]). The IFS switch opens and causes the BPO mode to occur no DTCs are set. Also if the IFS switch is open a power reset indicator in the instrument cluster (IC) illuminates. The PCM monitors the frequency signal that the battery control module (BCM) sends out on the BPO circuit 3003 (VT/WH).

^ DTC P0A27 Hybrid Battery Power Off Circuit the BCM will set this DTC if any of the following conditions are met:

^ BCM detects a thermistor temperature greater than 57°C (134°F) for at least one second

^ Contactor control is reported as closed~ while contactor status confirmed is reported as open for 10 seconds

^ High-voltage traction battery (HVTB) is overheated.

^ It is possible for the PCM to set DTC P0A28 (Hybrid Battery Power Off Circuit Low) as a continuous fault.

Possible Causes
- Fuse
- Circuitry
- High voltage traction battery (HVTB)