P0229 fault code: Throttle/Pedal Position Sensor/Switch 'C' Circuit Intermittent

Last updated · OBDCode UK editorial

Can I drive with P0229? — Drive with care

Intermittent sensor C can make response come and go. Drive with care on a short trip to a garage. Stop if the pedal stops matching engine response.

P0229 means “Throttle/Pedal Position Sensor/Switch 'C' Circuit Intermittent” — a fuel and injector circuits fault in the powertrain. Drive with care. Throttle or accelerator-pedal position sensor C is dropping in and out instead of tracking the pedal smoothly. The computer cannot trust that channel from moment to moment.

Can I DIY?

Caution — conditions apply. We do not publish DIY repair or strip-down steps for this code on this page. Read codes and observe only; leave the repair to a qualified garage.

Caution — conditions applyDIY boundary
ToolsBasic tools only — for example a household socket set, tyre gauge, or a consumer OBD reader.

Some checks may be possible for a careful DIY driver with the right tools and a safe place to work. Stop if anything feels beyond your skill or kit.

12V electrical safety

On a 12V battery: disconnect negative first, reconnect negative last. Prevent sparks and short circuits. Stop if the battery is damaged or sits near orange high-voltage cables.

P02xxFuel and injector circuits
MOT fail riskif the warning light stays on

What does P0229 mean?

P0229 is a generic (SAE standard) powertrain code reported by your car’s engine control unit. It sits in the P02xx block, which covers fuel and injector circuits. The stored description is “Throttle/Pedal Position Sensor/Switch 'C' Circuit Intermittent”. The code itself tells you which circuit or system tripped the fault — not always the exact part that failed.

Will P0229 fail an MOT?

An illuminated engine management light is a Major defect at MOT (automatic fail) until the fault is repaired and the light stays off. An intermittent lamp that is on at the test still fails as a Major.

Before booking your test, check what usually fails on your car: see our MOT pass rates by make and model, built from 33.1 million DVSA tests.

What the MOT data says

No MOT certificate item corresponds to this code; MOT outcome data cannot be shown.

Related guides

Car diagnostic test cost: compare the scopeUK booking marketplaces currently publish diagnostic averages of about £52–£65. Engine management light on: steady or flashing?A steady engine management light means the computer has stored a fault. Drive with caution and get the code read. A flashing light is different — stop when it is safe.
P0200Injector Circuit/Open P0201Injector Circuit/Open - Cylinder 1 P0202Injector Circuit/Open - Cylinder 2 P0203Injector Circuit/Open - Cylinder 3 P0204Injector Circuit/Open - Cylinder 4 P0205Injector Circuit/Open - Cylinder 5 P0206Injector Circuit/Open - Cylinder 6 P0207Injector Circuit/Open - Cylinder 7

P0229 — quick answers

Is it safe to drive with P0229?

Drive with care. Intermittent sensor C can make response come and go. Drive with care on a short trip to a garage. Stop if the pedal stops matching engine response.

Can I fix P0229 myself?

Caution — conditions apply. We do not publish DIY repair or strip-down steps for this code on this page. Read codes and observe only; leave the repair to a qualified garage. Basic tools only — for example a household socket set, tyre gauge, or a consumer OBD reader.

Will P0229 fail my MOT?

An illuminated engine management light is a Major defect at MOT (automatic fail) until the fault is repaired and the light stays off. An intermittent lamp that is on at the test still fails as a Major.

Fault-code identifiers are standard diagnostic facts. Their explanations and diagnostic guidance on this site are original editorial summaries, not reproduced SAE wording. MOT defect rules reflect the DVSA MOT inspection manual (2026). This page is general guidance for UK drivers, not a substitute for a professional diagnosis.