Fault code P1652 – a step-by-step guide to diagnosing and fixing it

Error code P1652 is displayed and the check engine light is on - what does this mean?

The DTC P1652 is a manufacturer-specific fault code that is recognized by the OBD system and typically indicates problems with the fuel pump control or the fuel system. This code mainly occurs in Ford vehicles and indicates a fault in the fuel pump relay or the associated circuit.

What can cause this fault code?

• Defective fuel pump relay
• Damaged wiring to the fuel pump relay
• Loose or corroded plug connections
• Defective fuel pump
• Faulty fuse in the fuel pump circuit
• Defective engine control unit (PCM/ECM)
• Short circuit in the fuel pump circuit
• Interruption in the ground cable

What symptoms occur in parallel with fault code P1652?

• Starting problems: The vehicle is difficult or impossible to start
• Engine misfires: Irregular engine running while driving
• Loss of power: Reduced engine power, especially under load
• Jerking: The vehicle jerks or stutters when accelerating
• Stalling: The engine stalls while driving or idling
• Fuel smell: Unusual smell of gasoline in or around the vehicle

How to fix the problem of error code P1652?

• Repairing fault code P1652 requires a systematic diagnosis of the fuel pump circuit.
• Replace the fuel pump relay with a new or known working relay and test the system
• Check all fuses in the fuel pump circuit and replace blown fuses
• Inspect all wiring between relay, fuse box and fuel pump for damage and repair defective wiring
• Clean all plug connections in the fuel pump system and treat corroded contacts with contact spray
• Measure the voltage at the fuel pump and replace the pump if the performance is insufficient
• Carry out a complete diagnosis of the engine control unit and have it reprogrammed or replaced if necessary