Fault code P1650 – a step-by-step guide to diagnosing and fixing it

Error code P1650 is displayed and the check engine light is on - what does this mean?

The DTC P1650 is a manufacturer-specific fault code that is recognized by the OBD system when problems occur with the fuel pump control or the fuel pump relay. This trouble code mainly occurs in Ford vehicles and indicates faults in the fuel system that can affect engine performance.

What can cause this fault code?

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

What symptoms occur in parallel with fault code P1650?

• Starting problems: The vehicle is difficult or impossible to start
• Engine stuttering: Irregular engine running, especially at low engine speeds
• Loss of power: Significantly reduced engine power while driving
• Jerking engine: Jerking and misfiring when accelerating
• Engine stalls: Sudden engine shutdown while driving
• Poor throttle response: Delayed response when accelerating

How can the problem with fault code P1650 be rectified?

• Repairing fault code P1650 requires a systematic diagnosis of the fuel system.
• Replace the fuel pump relay and check all relay positions in the fuse box
• Check all wiring between control unit and fuel pump for continuity and insulation damage and replace defective cables
• Replace fuel pump including fuel filter if pump does not build up sufficient pressure
• Clean all plug connections in the fuel system, treat with contact spray and tighten firmly
• Check the fuses in the fuel pump circuit and replace blown fuses
• Have the engine control unit checked for defects and repair or replace if necessary
• Check the ground connections of the fuel pump and lay new ground cables