Fuel Cooler Pump Control Circuit Low
The P008D code indicates that the Engine Control Module (ECM) has detected a low voltage condition in the fuel cooler pump control circuit. This pump is responsible for circulating fuel through the cooler to maintain optimal fuel temperature. A low voltage signal suggests a short to ground, open circuit, or faulty component, which can lead to inadequate fuel cooling and potential performance issues.
1. Most Common Causes
- Short to ground in the fuel cooler pump control circuit wiring
- Excessive resistance in the circuit connectors or wiring
- Internal failure of the fuel cooler pump (open coil, worn brushes in brushed motors)
- Defective fuel cooler pump relay with burnt contacts
- Faulty engine control module (ECM) actuator driver stage
- Loose connection or corrosion at connector terminals
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Engine performance issues (hesitation, stalling)
- Fuel temperature warning light (if equipped)
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Visually inspect the fuel cooler pump and wiring for damage or corrosion.
Step 3: Test the pump control circuit voltage with a multimeter; should be near battery voltage when commanded on.
Step 4: Check the fuse and relay for the fuel cooler pump; replace if blown.
Step 5: If circuit and power are good, test the pump resistance; replace if out of spec.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the fuel cooler pump failure can lead to excessive fuel temperatures, potentially causing engine performance issues or damage.
How much does it cost to fix?▼
Repair costs typically range from $50 to $150 for parts and labor, depending on the root cause (e.g., wiring repair vs. pump replacement).
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.