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P0344 OBD-II Trouble Code: Camshaft Position Sensor Circuit Intermittent

Check Engine Light

P0344 code definition

Diagnostic trouble code (DTC) P0344 is a generic powertrain DTC that covers all makes and models of vehicles manufactured starting in 2003. This code occurs when an incoming signal from the camshaft position sensor (or sensors) is missing at one point or another when it should not be. This indicates an intermittent electrical circuit fault, and this code may occur in combination with codes P0340 and P0341, both of which also indicate intermittent electrical circuit problems with the camshaft position sensor failing to send signals to indicate that the crankshaft sensor signal is correct.

What the P0344 code means

When the P0344 code is stored, it indicates that the signal from the camshaft position sensor has been interrupted. This sensor measures the rotational position of the camshaft as it relates to the crankshaft. Data from the camshaft position sensor is used to control fuel injector timing and ignition spark. If for any reason this signal is interrupted at any time, code P0344 will be stored, and the Check Engine Light or MIL (Malfunction Indicator Lamp) will illuminate.

What causes the P0344 code?

The P0344 code may be stored for a number of reasons, including:

  • An open or shorted camshaft position sensor
  • A faulty camshaft position sensor
  • Poor electrical connection to the camshaft position sensor
  • A faulty starter motor
  • A weak or dead battery
  • A short in the starting system circuit

What are the symptoms of the P0344 code?

The P0344 code may not be preceded by any symptoms at all, other than illumination of the Check Engine light. In some cases, however, the driver may notice one or more of a number of symptoms, including:

  • Difficulty starting the engine.
  • Engine cranks but does not start.
  • Engine dies unexpectedly and does not restart.
  • Rattling, metallic-sounding noises coming from the engine.
  • Illumination of the Check Engine light
  • Lack or loss of power to the engine.

How does a mechanic diagnose the P0344 code?

When the P0344 code is saved, a mechanic will inspect the camshaft position sensor and the crankshaft position sensor and their respective wiring. They will look for bare wires, areas that have been chafed or rubbed, melted plastic, and/or burnt areas. They will then inspect the connectors and their terminals. These inspections should reveal the source of the intermittent signal.

Common mistakes when diagnosing the P0344 code

If the source of the problem is misdiagnosed, the P0344 code will be saved again, and the problem will continue. Misdiagnoses can result in a number of mistakes, including replacing the camshaft position sensor when the problem is actually one of the following issues:

  • Damaged wiring or a poor connection
  • Defective timing component
  • Defective crankshaft position sensor
  • Misfiring engine

How serious is the P0344 code?

An intermittent signal from the camshaft position sensor can indicate a number of potentially serious issues. If left without repair, the vehicle could stall and not be able to start again. It could also fail to start after being shut down and left.

What repairs can fix the P0344 code?

Depending on the cause of the P0344, there are a number of potential repairs that can fix the P0344 code. This include:

Additional comments for consideration regarding the P0344 code

It is very easy to misdiagnose the cause of a P0344, and thus it is very important to thoroughly inspect all components involved in sending the timing signal from the camshaft position sensor. If the problem is a poor connection, the solution may be as simple as cleaning the connectors and terminals.

Need help with a P0344 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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