Worn or faulty throttle position or accelerator pedal sensor track giving a dropout in its signal; Loose, corroded or contaminated connector terminals at the sensor or throttle body; Damaged, chafed or broken wiring in the sensor B signal, supply or earth circuit; Dirty or faulty electronic throttle body affecting position feedback; Poor power supply or earth connection to the sensor, such as a weak reference voltage or a bad engine earth; Water ingress or heat damage to a connector or harness near the engine; Internal fault in the engine control unit.

P0224

Throttle/Pedal Position Sensor/Switch B Circuit Intermittent.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
2: AreaFuel and air metering (injector circuit)
24: FaultThe specific fault in that area

What it means

P0224 means the engine control unit has detected an intermittent fault in the Throttle/Pedal Position Sensor/Switch B circuit. The signal from sensor B drops out, spikes or jumps briefly, then returns to normal, so it is not a steady fault. Which physical sensor is 'B' (throttle body or accelerator pedal) depends on the vehicle, so check the model's wiring information.

Symptoms

Engine warning light on
Car goes into limp mode with reduced power
Hesitation or surging when pressing the accelerator
Unstable or erratic idle
Intermittent loss of throttle response
Occasional stalling or hesitation at low speed

Possible causes

Worn or faulty throttle position or accelerator pedal sensor track giving a dropout in its signallikely
Loose, corroded or contaminated connector terminals at the sensor or throttle bodylikely
Damaged, chafed or broken wiring in the sensor B signal, supply or earth circuitlikely
Dirty or faulty electronic throttle body affecting position feedbackpossible
Poor power supply or earth connection to the sensor, such as a weak reference voltage or a bad engine earthpossible
Water ingress or heat damage to a connector or harness near the enginepossible
Internal fault in the engine control unitrare

How to diagnose

Read all stored and pending codes and note any other throttle, pedal or reference voltage codes
Review freeze frame data to see engine speed, load and throttle angle when the fault set
Inspect the throttle body and pedal connectors and wiring for damage, corrosion, chafing, water or loose pins
With the ignition on, view live data for sensor B and sensor A while moving the throttle or pedal slowly through its full range, looking for dropouts or spikes
Wiggle test the harness and connectors with live data displayed to see if the signal glitches
Check the sensor reference voltage, signal and earth at the connector against the manufacturer's specification
Check the throttle body for carbon build-up and smooth movement, following the model-specific procedure
Test the wiring for continuity and shorts to earth or supply, then check the battery and charging voltage

How to fix

Repair or replace damaged wiring and clean or replace faulty connector terminals
Replace the faulty accelerator pedal assembly or throttle body if the sensor signal drops out
Clean the throttle body if contamination is affecting movement, then carry out any throttle relearn the manufacturer requires
Restore good power and earth connections to the sensor circuit
Clear the codes after the repair, then road test and recheck live data to confirm the fault has gone

Can I keep driving?

Medium severity

The car may drive, but it can drop into limp mode or lose throttle response without warning, which can be unsafe in traffic. Have it checked soon and avoid long journeys or overtaking until it is repaired.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.