P008C medium Severity

P008C: Fuel Cooler Pump Control Circuit Open

May cause reduced engine performance, increased fuel consumption and potential fuel system issues if not addressed

Overview

P008C indicates an open circuit in the fuel cooler pump control circuit, detected by the Powertrain Control Module on vehicles with a fuel cooling system, often diesel engines. Investigate fuel cooler pump, wiring, connectors, fuses/relays, and PCM outputs.

Common Symptoms

  • Check Engine Light illuminated
  • Decreased engine performance or power loss
  • Acceleration and idle irregularities
  • Increased fuel consumption
  • Unusual noise from fuel cooler pump

Most Common Causes

Faulty fuel cooler pump high

Pump internal failure or inability to run due to open circuit within pump winding or internals.

Damaged or corroded wiring/connectors in fuel cooler pump circuit high

Open circuit often due to harness damage, corrosion, broken terminals or connector issues.

Blown fuse or failed relay in pump control circuit medium

Electrical supply to pump interrupted by protective device failure.

Faulty Powertrain Control Module (PCM) driver circuit low

Rare, but possible internal PCM output driver failure causing open circuit detection.

Diagnostic Steps

  1. Verify the presence of the P008C code with a professional OBD-II scan tool and check for related codes
    Expected: P008C present; potential related fuel system or circuit codes
    Interpretation: Confirms the code and checks for additional context.
  2. Perform a thorough visual inspection of the fuel cooler pump, wiring harness, and connectors
    Expected: No visible damage, corrosion, broken wires or loose connectors
    Interpretation: Identifies obvious physical issues that would cause an open circuit.
  3. Check fuses and relays associated with the fuel cooler pump circuit
    Expected: Fuses intact and relay clicks/operates properly
    Interpretation: Determines whether power supply disruption is cause.
  4. Use a multimeter to test for voltage at the fuel cooler pump control circuit and continuity of wiring
    Expected: Correct voltage present and continuity within expected range
    Interpretation: Validates electrical integrity of circuit; opens or abnormal readings indicate wiring/pump issues.
  5. Test the fuel cooler pump operation directly if accessible and verify PCM output signals
    Expected: Pump receives control signal and operates when commanded
    Interpretation: Confirms pump and PCM driver functionality.

Repair Solutions

Replace faulty fuel cooler pump medium
Estimated Cost: $200 - $800

Costs vary widely depending on vehicle and diesel engine application; includes parts and labor.

Repair or replace damaged wiring and connectors medium
Estimated Cost: $50 - $300

Depends on extent of harness damage and accessibility.

Replace blown fuse or relay easy
Estimated Cost: $5 - $50

Simple electrical component replacements; ensure root cause of failure is addressed.

Repair or replace PCM if internal driver fault is confirmed hard
Estimated Cost: $500 - $1500

High cost and should be last resort after all wiring and component tests.

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Assuming poor fuel quality or clogged fuel filter is the cause without electrical diagnostics

Frequently Asked Questions

What does the P008C code mean?

The P008C code stands for Fuel Cooler Pump Control Circuit Open. This generally indicates an issue with the Fuel System system.

How serious is the P008C code?

This is a medium priority issue. May cause reduced engine performance, increased fuel consumption and potential fuel system issues if not addressed

What are the symptoms of P008C?

You may experience the following: Check Engine Light illuminated, Decreased engine performance or power loss, Acceleration and idle irregularities.

Potential causes for OBDII code P008C

The most common causes are: Faulty fuel cooler pump, Damaged or corroded wiring/connectors in fuel cooler pump circuit, Blown fuse or failed relay in pump control circuit.

Estimated repair costs for different causes of P008C

Expect to pay around $50 if the issue is a Replace blown fuse or relay, but up to $1500 if the Repair or replace PCM if internal driver fault is confirmed needs replacement.

Is P008C a generic or manufacturer-specific code?

Yes, P008C is a generic code that applies to all OBD-II compliant vehicles, including Ford, Toyota, Honda, Chevrolet, Nissan, Dodge, BMW, and more.

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