P0A85 Fault Code

Hybrid Battery Pack Cooling Fan 1 Control Circuit High

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0A85 fault code indicates an issue with the Hybrid Battery Pack Cooling Fan 1 Control Circuit, specifically identifying that the circuit is reading a high signal when it shouldn’t. This usually suggests a malfunction within the control circuit that monitors the fan operation.

• This can lead to inadequate cooling of the hybrid battery pack.
• If the hybrid battery overheats, it can affect performance and potentially lead to battery damage.
• Monitoring and maintaining proper fan operation is crucial for the longevity of the hybrid battery.

What are the symptoms of the P0A85 code?

Drivers may notice several symptoms when this fault code is triggered:

• Increased engine temperature due to insufficient cooling of the hybrid battery.
• Warning lights on the dashboard, potentially indicating hybrid system warnings or overheating issues.
• Reduced performance from the hybrid system as the vehicle may limit power to protect the battery from damage.

What causes the P0A85 code?

Common causes for this fault code include:

• Faulty cooling fan or its control circuit
• Short circuits or open circuits in the wiring harness
• Malfunctioning battery management system (BMS)
• Failed relays or connectors affecting the cooling fan operation
• Software issues within the vehicle's ECU that affect fan control.

How to fix P0A85?

To resolve the P0A85 fault code, consider the following steps:

• Inspect the wiring and connectors for any damage or corrosion.
• Test the cooling fan operation to ensure it is functioning correctly.
• Check and replace any faulty relays associated with the cooling fan.
• If necessary, update the vehicle's software to address any electronic malfunctions.
• Replace the hybrid battery pack cooling fan if it is determined to be defective.