What causes fault code P0220?

• Most likely: Faulty accelerator pedal position (APP) sensor or throttle position sensor (TPS) • Likely: Corrosion or poor connection in the connector at the throttle body or pedal • Possible: Wiring damage (short to ground or open circuit in the signal wire) • Rare: Faulty Engine Control Unit (ECU) or software glitch

Powertrain (Engine & Gearbox)Standard EOBD

P0220 - Throttle/Pedal Position Sensor/Switch 'B' Circuit

Q: What are the symptoms of fault code P0220?

• Check engine light illuminated (MIL) • Vehicle enters 'Limp Home Mode' (reduced engine power) • Poor or no throttle response • Engine RPM limited (stalling or surging) • Fails emissions inspection

Q: How do you fix fault code P0220?

STEP 1: Inspect connectors at the accelerator pedal and throttle body for corrosion or bent pins. STEP 2: Use a scan tool to monitor live data. Ensure sensor B tracks sensor A smoothly without voltage drops/spikes. STEP 3: Measure reference voltage (should be 5.0V) and ground using a multimeter. Test signal output; it should vary linearly between approx. 0.5V and 4.5V relative to pedal position. STEP 4: If wiring and voltages are correct, replace the accelerator pedal assembly or throttle body. A throttle relearn/adaptation procedure may be required after replacement.

Last updated:1 February 2026

Related:Throttle Body, Gaspedalsgivare / Accelerator Pedal Position Sensor, Engine Control Unit (ECU), Wiring Harness

System

Powertrain (Engine & Gearbox)

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Technical Description

Diagnostic Trouble Code (DTC) P0220 is set when the powertrain control module (PCM) detects a signal voltage from the throttle position sensor 'B' (TPS) or accelerator pedal position sensor 'B' (APP) that is outside of the specified operating range. Modern drive-by-wire systems use multiple sensors for redundancy. If the PCM detects a correlation error or a voltage deviation in circuit 'B', it will trigger this code and typically enter 'Limp Home Mode' to ensure safety. This involves restricting throttle plate opening and limiting engine RPM through high-priority CAN bus messaging.

Possible Causes

Faulty accelerator pedal position (APP) sensor or throttle position sensor (TPS)

Corrosion or poor connection in the connector at the throttle body or pedal

Wiring damage (short to ground or open circuit in the signal wire)

Faulty Engine Control Unit (ECU) or software glitch

Symptoms

Check engine light illuminated (MIL)

Vehicle enters 'Limp Home Mode' (reduced engine power)

Poor or no throttle response VIDA.

Engine RPM limited (stalling or surging)

Fails emissions inspection

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P0220 - Throttle/Pedal Position Sensor/Switch 'B' Circuit

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P0220 - Throttle/Pedal Position Sensor/Switch 'B' Circuit

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