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

Powertrain Severity: Moderate Generic OBD-II

The engine computer does not see a valid camshaft sensor signal.

Common causes

  • Faulty camshaft sensor
  • Wiring damage
  • Timing problem

Symptoms

  • Hard or long cranking
  • Check engine light
  • Possible no start

What to check

  1. Inspect connector
  2. Check signal while cranking
  3. Verify timing if the sensor is good

Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for P0340, follow the service information for that make and model.

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