P0222 fault code: Throttle/Pedal Position Sensor/Switch 'B' Circuit Low

Last updated · OBDCode UK editorial

Can I drive with P0222? — Limit your driving

Our verified driving guidance for P0222 is limited driving, not simply drive with care. A low B-circuit can mean weak or missing pedal/throttle data. Drive only as far as a garage; stop if the throttle is unsafe.

P0222 means “Throttle/Pedal Position Sensor/Switch 'B' Circuit Low” — a fuel and injector circuits fault in the powertrain. Limit your driving. Sensor B voltage is too low. We treat this drive-by-wire low-signal case more tightly than the generic B-circuit code. It is still a pedal/throttle signal, not an injector rail fault.

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 We do not publish DIY repair or strip-down steps for this code on this page.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 P0222 mean?

P0222 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 'B' Circuit Low”. The code itself tells you which circuit or system tripped the fault — not always the exact part that failed.

Will P0222 fail an MOT?

A lit engine management light is a Major defect at MOT (automatic fail) until the fault is repaired and the light stays off. Limp-mode throttle faults still fail if the lamp is on.

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

P0222 — quick answers

Is it safe to drive with P0222?

Limit your driving. Our verified driving guidance for P0222 is limited driving, not simply drive with care. A low B-circuit can mean weak or missing pedal/throttle data. Drive only as far as a garage; stop if the throttle is unsafe.

Can I fix P0222 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 P0222 fail my MOT?

A lit engine management light is a Major defect at MOT (automatic fail) until the fault is repaired and the light stays off. Limp-mode throttle faults still fail if the lamp is on.

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.