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What Does P0340 Code Mean?

OBD-II Code P0340 is defined as a Camshaft Position Sensor "A" Circuit Malfunction

The Camshaft Position Sensor measures the exact rotational position of the camshaft. This provides a critical data signal used by the Powertrain Control Module (PCM) to control Ignition Spark and Fuel Injector Timing. When this signal is interrupted for any reason, code P0340 is set and the MIL or Check Engine Light is illuminated. 

P0340 Symptoms

  • Check Engine Light will illuminate
  • Hard starting/cranking without starting
  • Engine hesitation or stalling
  • Engine dies and will not re-start
  • In many cases, no abnormal symptoms may be noticed

Common Problems That Trigger the P0340 Code

  • Defective Camshaft Position Sensor
  • Faulty or corroded Camshaft Position Sensor wiring or connections
  • Defective Crankshaft Position Sensor
  • Rough running/misfiring Engine

Common Misdiagnoses

  • Camshaft Position Sensor is replaced when the cause is a defective Crankshaft Position Sensor 
  • Camshaft Position Sensor is replaced when the cause is a poor connection or chafed wiring
  • Camshaft Position Sensor is replaced when the cause is a misfiring engine
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