Fault code P1653 – a step-by-step guide to diagnosing and fixing it

Error code P1653 is displayed and the check engine light is on - what does this mean?

The DTC P1653 is a manufacturer-specific fault code that is recognized by the OBD system and indicates a problem with the fuel pump control or the fuel supply system. This trouble code mainly occurs in Ford vehicles and indicates that the fuel pump is not being controlled properly or that there is a fault in the fuel pump relay.

What can cause this error code?

• Defective fuel pump relay
• Damaged cable to the fuel pump
• Loose or corroded plug connections
• Defective fuel pump
• Faulty fuse in the fuel pump circuit
• Defective engine control unit (PCM/ECM)
• Broken fuel pump ground wire
• Oxidized contacts in the fuse box

What symptoms occur in parallel with fault code P1653?

• Starting problems: The vehicle is difficult or impossible to start
• Jerking when idling: The engine runs unevenly or stutters
• Loss of power: Reduced engine power while driving
• Engine misfires: Irregular engine running at different engine speeds
• Sudden stalling: The engine stalls while driving
• Smell of fuel: Smell of fuel inside or around the vehicle

How to fix the problem of error code P1653?

• The repair requires a systematic diagnosis of the fuel supply, starting with the simplest components.
• Locate the fuel pump relay in the fuse box and replace it with a new one, also checking the relay socket for corrosion
• Check the fuel pump fuse and replace if necessary, then test the circuit for short circuits
• Clean and tighten the plug connections to the fuel pump on the tank and treat with contact spray
• Measure the fuel pump pressure with a pressure gauge and replace the pump if the pressure is insufficient
• Check the wiring harness between the engine control unit and fuel pump for damage and repair defective lines
• Clean the ground cable of the fuel pump on the vehicle floor and tighten firmly