Fault code P1501 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P1501 – Vehicle Speed Sensor Out Of Self Test Range

P1501: Causes, signs and repairs

Error code P1501 is displayed and the check engine light is on - what does this mean?

The DTC P1501 is a manufacturer-specific fault code that is recognized by the OBD system and indicates a problem with the fuel pump switch or the fuel pump control. This code mainly occurs in Ford vehicles and indicates a fault in the fuel supply system. The EOBD system registers this fault code if the fuel pump cannot be properly controlled or monitored.

What can cause this fault code?

Defective fuel pump switch (Fuel Pump Switch)
Faulty fuel pump
Damaged wiring to the fuel pump switch
Corroded or loose plug connections
Defective fuel pump relay
Faulty PCM connection (Powertrain Control Module)
Broken fuel pump ground wire
Defective inertia sensor (inertia switch)

What symptoms occur in parallel with fault code P1501?

Starting problems: The vehicle is difficult or impossible to start
Engine misfires: Irregular engine running while driving
Loss of power: Reduced engine power, especially when accelerating
Stuttering engine: Engine runs unevenly or stutters when idling
Sudden stalling: Engine stalls while driving
Fuel odor: smell of gasoline inside or around the vehicle
Abnormal fuel pump noise: Abnormally loud or no noise from the fuel pump

How to fix the problem of trouble code P1501?

Repairing trouble code P1501 requires a systematic diagnosis of the fuel supply components.
Check and replace the fuel pump switch: Test the Fuel Pump Switch for proper operation and replace with an original part if defective
Replace fuel pump: Replace the complete fuel pump including fuel filter and pressure regulator if defective
Repair wiring: Check all cables and connections to the fuel pump for damage and replace defective lines
Clean plug connections: Clean corroded contacts on the fuel pump connector and treat with contact spray
Replace the fuel pump relay: Replace the fuel pump relay with a new one and check the relay socket
Reset the inertia sensor: Locate the inertia switch, reset or replace if defective
Carry out PCM diagnostics: Check the control unit for correct signal transmission and reprogram if necessary

FAQ - Frequently asked questions about DTC P1501

Can I continue driving with error code P1501?

Continuing to drive with code P1501 is not recommended, as the fuel supply may be impaired. This can lead to sudden engine failure and represents a safety risk.

How much does it cost to repair fault code P1501?

The repair costs for P1501 vary depending on the cause: fuel pump switch 50-150€, complete fuel pump 300-800€, wiring repair 100-300€, relay 20-50€.

Is error code P1501 the same for all makes of car?

No, P1501 is a manufacturer-specific DTC that mainly occurs in Ford vehicles. Other manufacturers use different codes for similar problems.

Can I repair fault code P1501 myself?

Simple work such as relay or fuse replacement is possible, but fuel pump work should be carried out by specialists due to the risk of fire.

How can I prevent error code P1501?

Regular maintenance of the fuel system, use of high-quality fuel and timely fuel filter replacement can prevent P1501.

How long does it take to diagnose error code P1501?

A professional diagnosis of EOBD code P1501 usually takes 1-2 hours, depending on the complexity of the problem and the accessibility of the components.

Vehicles in which fault code P1501 occurs most frequently

Error code P1501 is a manufacturer-specific DTC that mainly indicates problems with the fuel pump control unit and can occur in various vehicle models, but is most common in the following vehicles:

Ford: Focus, Fiesta, Mondeo, Galaxy, S-Max, C-Max, Kuga (1998-2015)
Mazda: 3, 6, CX-5, CX-7, MX-5 (2003-2012)
Lincoln: Navigator, Town Car, Continental (2000-2010)
Mercury: Grand Marquis, Mountaineer, Sable (1999-2009)
Jaguar: X-Type, S-Type (2001-2008)
Volvo: S40, V40, V50, S60 (2000-2007)
If code P1501 occurs in your vehicle, you should first check whether it is a known problem for your vehicle model. Many Ford vehicles have specific service bulletins for this error code. Professional OBD diagnostics are recommended, as the fuel supply is a safety-critical system. In older vehicles, it may be worth replacing the fuel pump switch and relay as a preventative measure before major damage occurs.

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