Faulty accelerator pedal position sensor (worn track or internal fault); Faulty throttle position sensor or throttle body (dirty, worn or sticking); Damaged wiring, chafed loom or short or open circuit in the sensor signal, reference or earth wires; Corroded, loose or contaminated connector terminals at the sensor or control unit; Low or unstable sensor reference voltage or poor earth supply; Fault inside the engine control unit; Outdated control unit software where the manufacturer has issued a fix for the fault.

P0226

Throttle/Pedal Position Sensor/Switch C Circuit Range/Performance.

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)
26: FaultThe specific fault in that area

What it means

P0226 is the generic code for a range or performance problem in the Throttle/Pedal Position Sensor/Switch C circuit. The engine control unit has seen a signal from sensor C that is implausible, either out of its expected range or disagreeing with the other throttle or pedal sensors or with the requested throttle angle. Which physical sensor is 'C' (usually a third track on the pedal or throttle body) depends on the make, model and engine.

Symptoms

Engine warning light on
Car goes into limp mode with reduced power
Poor or delayed throttle response
Unstable or high idle
Hesitation or surging when accelerating
Engine may stall or refuse to rev above a set limit

Possible causes

Faulty accelerator pedal position sensor (worn track or internal fault)likely
Faulty throttle position sensor or throttle body (dirty, worn or sticking)likely
Damaged wiring, chafed loom or short or open circuit in the sensor signal, reference or earth wirespossible
Corroded, loose or contaminated connector terminals at the sensor or control unitpossible
Low or unstable sensor reference voltage or poor earth supplypossible
Fault inside the engine control unitrare
Outdated control unit software where the manufacturer has issued a fix for the faultrare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting other throttle, pedal or reference voltage codes.
Check for relevant technical service bulletins and software updates for the specific model and engine.
Visually inspect the pedal sensor, throttle body, wiring and connectors for damage, water ingress, corrosion or chafing.
Inspect the throttle body for heavy carbon build-up or a sticking plate, and check it moves freely.
With live data, press the pedal slowly through its full range and compare all pedal and throttle sensor channels for smooth, matching signals without dropouts.
Check the sensor reference voltage, signal and earth at the connector against the manufacturer's specification, as the sensor layout varies by model.
Wiggle-test the harness while watching live data to find intermittent faults, and check wire continuity and insulation resistance.
Perform any throttle adaptation or relearn procedure the manufacturer requires after repairs, then road test and recheck for codes.

How to fix

Replace the faulty accelerator pedal sensor assembly.
Clean or replace the throttle body, then carry out the throttle relearn procedure.
Repair or replace damaged wiring and connectors, using proper crimps or soldered and sealed joints.
Restore the reference voltage or earth supply by repairing the supply circuit fault.
Update the control unit software only if the manufacturer lists it as a fix for this fault.
Replace or repair the control unit only after all other causes are ruled out and the fault is confirmed.

Can I keep driving?

Medium severity

The car may run in limp mode with reduced power and unpredictable throttle response, which can be unsafe in traffic. Drive only if necessary and with care, and get it diagnosed soon.

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