P0344 - OBD II Trouble Code

Auto Systems and Repair

Camshaft Position Sensor Circuit Intermittent

Our emissions expert has put together the following information about the P0344 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.

OBD II Fault Code

  • OBD II P0344

Fault Code Definition

  • Camshaft Position Sensor Circuit Intermittent
What does this mean?
The Camshaft Position Sensor measures the exact rotational position of the camshaft in relation to the Crankshaft. This provides a critical data signal used by the Powertrain Control Module (PCM) to control Ignition Spark and Fuel Injector Timing. From the year 2000, the Camshaft Sensor is responsible for providing critical data to the Variable Valve Timing System which increases power and fuel economy while lowering emissions. When this signal is interrupted for any reason, code P0344 is set and the MIL or Check Engine Light is illuminated. 

Symptoms

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

Common Problems That Trigger the P0344 Code

  • Defective Camshaft Position Sensor
  • Faulty or corroded Camshaft Position Sensor wiring or connections
  • Defective Crankshaft Position Sensor
  • Rough running/misfiring Engine
  • Stretched Timing Chain or Timing Belt
  • Jumped Timing Chain or Belt 
  • Metallic and/or rattling engine noises.   

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
  • Camshaft Position Sensor is replaced when the cause is a defective Timing Component 
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