Fault code P0220 – a step-by-step guide to diagnosing and fixing it

Error code P0220 is displayed and the check engine light is on - what does this mean?

The OBD system detects a fault in the accelerator pedal position sensor B circuit, also known as the accelerator pedal position sensor. This DTC P0220 trouble code indicates that the engine control unit (ECU) is receiving a signal outside the expected voltage range from the secondary accelerator pedal position sensor.

What can cause this fault code?

• Defective accelerator pedal position sensor (APP sensor)
• Damaged or corroded cable connections to the sensor
• Loose or poor plug connections on the gas pedal pedal
• Short circuit or open circuit in the wiring
• Defective engine control unit (ECU)
• Mechanical damage to the gas pedal pedal
• Dirt or moisture in the sensor area
• Power supply problems to the APP sensor

What symptoms occur in parallel with fault code P0220?

• Irregular throttle response: The vehicle reacts with a delay or unpredictably when the accelerator pedal is pressed
• Emergency running program activated: Engine only runs in emergency mode with reduced power
• Idling problems: Unsteady or fluctuating idling
• Acceleration problems: Poor or no acceleration despite accelerator pedal operation
• Check engine light: Permanent display of the check engine light
• Engine stalling: Engine stalls while driving or idling

How can the problem with fault code P0220 be rectified?

• Repairing fault code P0220 requires a systematic approach to identify the exact cause.
• Replace the accelerator pedal position sensor completely: Replace the entire APP sensor, as this is usually installed as a complete unit (cost: 150-300 euros plus labor)
• Repair wiring harness and plug connections: Check and repair all cable connections between the accelerator pedal and control unit, clean corroded contacts and replace damaged cables
• Replace accelerator pedal unit completely: If there are mechanical defects on the pedal itself, the entire pedal unit with integrated sensor must be replaced (cost: 200-500 euros)
• Restore the power supply: Check and repair the 5V reference voltage and ground connections of the sensor by multimeter measurements and cable repairs
• Reprogram or replace engine control unit: If all other components are OK, ECU reprogramming or replacement may be required