Code Definition

P008C — Fuel Cooler Pump Open Circuit

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P008C

P008C is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P008C is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P008C is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

Some diesel and high output petrol applications fit a fuel cooler to protect the fuel system and the tank from excessive return fuel temperature, using an electric pump to circulate coolant through a small heat exchanger mounted in the fuel return line. The Engine Control Module (ECM) energises that pump through a relay or a low side driver once fuel temperature exceeds a threshold, and continuously monitors current flow through the circuit to confirm the pump is connected. DTC P008C is set when the ECM detects an open circuit in the fuel cooler pump control or supply circuit, meaning no curre...

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