Fault codeP0229

SEVERE

Throttle/Pedal Position Sensor/Switch C Circuit Intermittent

What this code means

Throttle/Pedal Position Sensor/Switch C Circuit Intermittent.

P0229 is a generic code: it means the same thing on every make. P0229 belongs to family P02xx — Injector circuit. Its page explains how to read a code and groups all its codes by part.

Type of fault

The signal drops out or jumps from time to time. This is typical of a poor contact: a loose or corroded connector, or a chafed wire that touches intermittently, often triggered by vibration or heat. The fault may disappear and come back; checking the wiring with the engine running is often revealing.

Throttle and accelerator pedal position sensors

On modern cars there is no cable between the pedal and the engine: sensors in the accelerator pedal tell the control unit how far you press, and an electric motor opens the throttle, whose position is measured by two more sensors. Each position is measured twice for safety, and both signals must agree.

What you notice

The engine often goes into limp mode: idle speed or very limited power, the accelerator barely responding. Sometimes jerks or idle speed surges.

How to check it

Check the connectors on the pedal and on the throttle body. A dirty throttle body can disturb the readings: cleaning it, then a relearn procedure, fixes some cases. Klaro shows the throttle and pedal positions; pressing the pedal slowly, they should rise smoothly without jumps.

Watch it live in Klaro

With an OBD2 adapter plugged in, these live readings show the part at work, when your car reports them:

Throttle position
Relative throttle position
Absolute throttle position B
Accelerator pedal position D
Accelerator pedal position E
Commanded throttle actuator

What to do

Have it checked promptly. An injection, fuel-supply or boost fault can cost power, cause misfires and eventually damage the engine or the catalytic converter. If the light is flashing or the engine is overheating, stop driving.

Clearing a code switches the light off but repairs nothing: if the fault remains, the code comes back. Clearing a fault code yourself →

How to read this code

PPowertrain
0standardised code
2Injector circuit
29P0229