P0335 Fault Code — Crankshaft Position Sensor Circuit Malfunction

The crankshaft position sensor (CKP) has a circuit fault. This is a critical sensor — the ECU uses it to determine engine speed and piston position. A fault can prevent the engine from starting.

Is It Safe to Drive With a P0335 Code?

Common Symptoms of a P0335 Fault

Engine will not start or cuts out while driving

Stalling at idle or low speed

Very rough running

EML on

Engine cranks but won't fire in severe cases

Possible Causes of P0335

A P0335 code can be triggered by faults in several different vehicle systems. Identifying the specific root cause requires proper diagnostic equipment and live data analysis — not just reading the code itself.

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CKP Sensor Wiring Fault

Wiring, connector or shielding on the crank sensor circuit is damaged.

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CKP Sensor Failure

The sensor itself has failed or is intermittent.

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Reluctor Ring Damage

The toothed ring the sensor reads may be damaged or have debris on it.

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ECU Signal Fault

The crank sensor signal is not reaching the ECU correctly.

Why we don't list the exact part: A P0335 code tells you what's happening but not why. Replacing parts based on the code alone without proper diagnosis is the most common way drivers waste money. A proper diagnosis identifies the exact cause first.

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UK repair cost estimate (parts + labour)

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P0335 and Your MOT

A stored P0335 fault code will cause your car to fail its MOT. The engine management light will be illuminated during the test, which is an automatic failure under current MOT testing standards. Even if the light clears temporarily, the code remains in the ECU memory and can be read by the tester's equipment.

Get the fault properly diagnosed and repaired first — then have the code cleared and confirm the light doesn't return before booking your test.

Related Fault Codes

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Summary

P0335 — crankshaft position sensor circuit malfunction — is a fault that requires proper diagnosis before any parts are replaced. The code indicates what system is affected but not which specific component has failed. A MotorLoom diagnostic report for £1.99 gives you the most likely specific cause for your exact vehicle, UK repair cost estimate and MOT risk instantly.