Fault code P0232 – a step-by-step guide to diagnosing and fixing it

Error code P0232 is displayed and the check engine light is on - what does this mean?

The OBD system has detected a fault in the fuel pump circuit of the secondary circuit (high-speed relay). This DTC P0232 indicates an electrical fault in the high-speed relay of the fuel pump, which can affect the optimum fuel supply.

What can cause this fault code?

• Defective high-speed fuel pump relay
• Damaged wiring to the fuel pump relay
• Corroded or loose plug connections on the relay
• Short circuit in the fuel pump control line
• Defective fuel pump with excessive power consumption
• Faulty engine control unit (ECM/PCM)
• Blown fuse in the fuel pump circuit
• Oxidized contacts in the relay socket

What symptoms occur in parallel with fault code P0232?

• Starting problems: The vehicle is difficult or impossible to start
• Loss of power: Reduced engine power at higher engine speeds
• Jerking engine: Unsteady engine running, especially under load
• Lack of fuel: Engine stalls while driving
• Acceleration problems: Delayed response when accelerating
• Check engine light: Permanent illumination of the check engine light

How can I fix the problem with fault code P0232?

• Repairing fault code P0232 requires a systematic diagnosis of the fuel pump electrics.
• Replace the fuel pump relay and clean all electrical connections at the relay socket
• Check wiring between ECM and fuel pump relay for damage and replace defective cables
• Loosen and clean the plug connections on the fuel pump relay and treat with contact spray
• Check fuses in the fuel pump circuit and replace blown fuses
• Test fuel pump for proper function and current consumption, replace entire pump if defective
• Check engine control unit for correct signal output and reprogram or replace if necessary