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Powertrain fault code

P0340: Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)

Fix soon

The car may start slowly or run poorly. If timing is suspected, stop driving: a slipped belt can damage the engine.

What P0340 means

The camshaft position signal is missing or doesn't line up with the crankshaft.

Common causes

  • Faulty camshaft sensor
  • Damaged wiring
  • Stretched timing chain or slipped belt (if paired with timing codes)

What to check first

  1. Check the sensor wiring.
  2. Ask a workshop to check cam and crank timing.

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Read your car's codes yourself, free

Plug a cheap ELM327 OBD-II adapter into the port under the dashboard and open the scan tool: Chrome or Edge on a computer with a USB adapter, or Chrome on Android with a Bluetooth LE adapter. It reads and clears codes and shows emissions readiness. It does not work on iPhone.

Open the free scan tool

Need help with P0340?

Tell us your car and what it is doing with P0340. We reply by email with what to check first, in plain words. Free.

Related codes

P0341

General guidance only, not a diagnosis. A qualified mechanic should confirm the cause before you replace parts.