Fault code P1515 – a step-by-step guide to diagnosing and fixing it

Error code P1515 is displayed and the check engine light is on - what does this mean?

The DTC P1515 is a manufacturer-specific fault code that is recognized by the OBD system and indicates a problem with the throttle control or the electronic accelerator pedal. This trouble code mainly occurs in Ford vehicles and indicates a fault in the electronic throttle control system (ETCS).

What causes can this error code have?

• Defective throttle valve or throttle valve actuator
• Damaged throttle position sensor (TPS)
• Faulty accelerator pedal position sensors
• Broken or damaged cable connections
• Defective engine control unit (ECU/PCM)
• Dirty or sticky throttle valve
• Loose or corroded plug connections
• Voltage problems in the electrical supply
• Software error in the engine control unit

What symptoms occur in parallel with error code P1515?

• Starting problems: The vehicle is difficult or impossible to start
• Irregular idling: Engine runs unevenly or stutters when idling
• Reduced engine power: Significant loss of power while driving
• Jerky acceleration: Vehicle reacts delayed to accelerator pedal inputs
• Increased fuel consumption: Engine operates inefficiently
• Stalling of the engine: Especially when stopping or idling
• Emergency running program activated: Vehicle switches to safety mode

How to fix the problem of error code P1515?

• The repair requires a systematic diagnosis of the throttle valve control and associated components.
• Clean and calibrate the throttle valve: Remove dirt with special throttle valve cleaner and then recalibrate
• Replace the throttle valve actuator: If the actuator is defective, replace the entire throttle valve unit and reprogram it
• Check and replace accelerator pedal position sensor: Test sensors in accelerator pedal for correct values and replace complete accelerator pedal if necessary
• Repair wiring harness and plug connections: Repair or replace damaged wiring, clean corroded contacts
• Reprogram the engine control unit: Carry out software update or replace ECU/PCM in case of hardware defect
• Check power supply: Test battery and alternator, replace weak battery