Hybrid Battery Pack Cooling Fan 3 Control Circuit/Open
The P0ACF code indicates an open or malfunction in the control circuit of the hybrid battery pack cooling fan 3. This fan is part of the thermal management system for the high-voltage hybrid battery. An open circuit means the electrical path to the fan motor is broken, preventing the fan from operating. This can lead to inadequate cooling of the battery pack, potentially causing overheating and reduced battery performance or damage.
01. Most Common Causes
- Open or shorted wiring in the fan 3 control circuit
- Faulty cooling fan 3 motor
- Blown fuse or relay for the fan circuit
- Failed hybrid battery control module
02. Symptoms You Will Notice
- Check Engine Light or hybrid system warning light on
- Reduced fuel economy or hybrid system performance
- Overheating of the hybrid battery pack
- Unusual noises from the battery cooling fan area
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the P0ACF code and check for related codes.
Step 2: Visually inspect the wiring and connectors for fan 3 for damage, corrosion, or loose connections.
Step 3: Test the fan motor by applying battery voltage directly to see if it operates.
Step 4: Check the fuse and relay for the fan circuit with a multimeter.
Step 5: If wiring and fan are okay, test the control signal from the hybrid battery control module.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code, as the hybrid battery may overheat, leading to reduced performance or permanent damage. Have the issue diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, depending on the cause. Replacing a fan motor or repairing wiring is on the lower end, while replacing the hybrid battery control module can be more expensive.