Fuel Cooler Pump Control Circuit Open
The P008C code indicates that the powertrain control module (PCM) has detected an open circuit in the fuel cooler pump control circuit. This means the electrical circuit that controls the fuel cooler pump is incomplete, preventing the pump from operating. The fuel cooler pump helps cool the fuel returning from the engine to the fuel tank, reducing fuel temperature and preventing vapor lock. An open circuit can be caused by a blown fuse, damaged wiring, a faulty relay, or a defective pump.
01. Most Common Causes
- Blown fuse in the fuel cooler pump circuit
- Open or shorted wiring in the pump control circuit
- Faulty fuel cooler pump relay
- Defective fuel cooler pump motor
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Possible reduced fuel economy or performance
- Fuel temperature may be higher than normal
- In some cases, no noticeable drivability issues
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all stored codes and freeze frame data.
Step 2: Visually inspect the fuel cooler pump fuse and replace if blown.
Step 3: Check the fuel cooler pump relay for proper operation and replace if faulty.
Step 4: Test the fuel cooler pump motor by applying battery voltage directly; if it doesn't run, replace the pump.
Step 5: Inspect wiring and connectors for damage, corrosion, or loose connections; repair as needed.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive short distances, but prolonged driving may cause excessive fuel temperatures, leading to vapor lock or reduced performance. It's best to diagnose and repair promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the cause. A fuse or relay replacement is cheaper, while a pump replacement may be higher.