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P0335Crankshaft Position Sensor "A" Circuit

What it means

The ECU sees no usable signal from the crankshaft position sensor. Without it the engine can't run (or runs on the camshaft signal only on some cars).

Symptoms

  • Engine cuts out while driving, sometimes restarts after cooling down
  • Long crank or no start
  • Rev counter drops to zero when it cuts out

Common causes

  • Faulty or dirty crankshaft sensor (metal debris on the tip)
  • Corroded connector or damaged harness
  • Damaged reluctor ring or wrong air gap
  • Loose sensor or wrong sensor fitted

What to check first

  1. Scope the crank signal while cranking and wiggling the harness
  2. Inspect the connector pins and the sensor tip
  3. Check the reluctor ring for damaged or missing teeth
Can I drive with P0335? Not recommended. P0335 can lead to stalling, limp mode or engine damage; diagnose it before driving further.
Practise it: Crankshaft position sensor in the engine simulator shows this fault in live data, tests and on the scope.Open in the simulator

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

How to test the parts behind P0335

Crankshaft position sensor (CKP)Wiring, typical values, multimeter and scope tests

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P0335: questions and answers

What does P0335 mean?

P0335: Crankshaft Position Sensor "A" Circuit. The ECU sees no usable signal from the crankshaft position sensor. Without it the engine can't run (or runs on the camshaft signal only on some cars).

What are the symptoms of P0335?

Engine cuts out while driving, sometimes restarts after cooling down. Long crank or no start. Rev counter drops to zero when it cuts out.

What causes P0335?

Faulty or dirty crankshaft sensor (metal debris on the tip). Corroded connector or damaged harness. Damaged reluctor ring or wrong air gap. Loose sensor or wrong sensor fitted.

How do you diagnose P0335?

1. Scope the crank signal while cranking and wiggling the harness 2. Inspect the connector pins and the sensor tip 3. Check the reluctor ring for damaged or missing teeth

Can I drive with P0335?

Not recommended. P0335 can lead to stalling, limp mode or engine damage; diagnose it before driving further.