P0A27
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PINPOINT TEST 2: DTC P0A27 - HYBRID BATTERY POWER OFF CIRCUIT
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 (IFS) switches opening, a high-voltage interlock circuit opening or the electrical interlock (EL I) circuit opening (fuse protected by the battery junction box [BJB] fuse 26 [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 illuminates.
- DTC P0A27 (Hybrid Battery Power Off Circuit) - the BCM sets 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
- Wiring, terminals or connectors
- HVTB
Diagnostic Procedure
WARNING:Wear high-voltage insulated safety gloves and a face shield when working with high-voltage batteries or cables. The high-voltage insulated safety gloves should be of the appropriate safety and protection rating. Inspect the gloves before use and always wear them with the leather outer glove. Any hole in the rubber insulating glove is a potential entry point for high-voltage. Failure to follow these instructions may result in serious personal injury or death.
WARNING:Turn OFF the ignition switch for a minimum of 5 minutes before removing high-voltage cables. High-voltage cables and wiring are orange in color. The nominal high-voltage traction battery voltage (HVTB) is 330 V DC. Failure to follow these instructions may result in serious personal injury or death.
WARNING:Depower the high-voltage traction battery (HVTB) before carrying out any removal or installation procedures affecting the high-voltage battery system. Failure to follow this instruction may result in serious personal injury or death.
WARNING:When servicing the high-voltage system, establish a buffer zone per the specified procedure. Failure to follow this instruction may result in serious personal injury or death.
