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SensorsSeverity High: diagnose before driving on

P0339Crankshaft Position Sensor "A" Circuit Intermittent

What it means

The crankshaft signal drops out for short moments. The engine may stall briefly and restart.

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

  • Corroded or loose terminal
  • Harness rubbing near the starter or exhaust
  • Failing sensor (often heat-related)

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 P0339? Not recommended. P0339 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 P0339

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

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P0339: questions and answers

What does P0339 mean?

P0339: Crankshaft Position Sensor "A" Circuit Intermittent. The crankshaft signal drops out for short moments. The engine may stall briefly and restart.

What are the symptoms of P0339?

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 P0339?

Corroded or loose terminal. Harness rubbing near the starter or exhaust. Failing sensor (often heat-related).

How do you diagnose P0339?

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 P0339?

Not recommended. P0339 can lead to stalling, limp mode or engine damage; diagnose it before driving further.