P0A85 Possible Causes
- Faulty battery cooling fan assembly
- Open or short circuit in battery cooling fan assembly wiring harness
- Poor electrical connection in battery cooling fan assembly circuit
- Faulty relay
- Faulty battery intelligent unit
- Faulty power management control ECU
What Does It Mean?
How to Fix Code P0A85
Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
P0A85 Possible Symptoms
Check engine light illuminated (or service engine soon warning light)
P0A85 Meaning
Cooling air flows into the intake at the right side of the rear seat and moves through an intake duct to the battery blower on the right surface of the luggage compartment. Additionally, cooling air passes through an intake duct (which connects the battery blower assembly to the upper right surface of the HV battery assembly) and flows toward the HV battery assembly.
Cooling air circulates from top to bottom between the HV battery modules. Once it has cooled the modules, it is discharged from the lower right surface of the HV battery assembly.
The exhausted air passes through an exhaust duct on the right surface of the luggage compartment and is discharged into the cabin as well as outside the vehicle.
The battery computer uses battery temperature sensors to detect the temperature of the HV battery assembly. Based on the results of this detection, the battery ECU controls the battery fan assembly. (Thus, the battery blower assembly starts when the HV battery temperature reaches a predetermined level.)
The speed of the battery cooling fan assembly is controlled by the power management control ECU. Power to the battery cooling fan assembly is supplied when the FCTL terminal of the power management control ECU activates the battery fan relay. The power management control ECU sends control signals (SI) to the battery cooling fan assembly to achieve the fan speed corresponding to the HV battery temperature. Information about the voltage applied to the battery cooling fan assembly (VM) is sent to the power management control ECU as a monitor signal using serial communication via OBDII Code P0A85 – Hybrid Battery Pack Cooling Fan Control Circuit High