P0340

What it means

This code indicates a problem with the signal from your engine's camshaft position sensor, which tells the car's computer the position of the camshaft. This information is used to synchronize fuel injection and ignition with the crankshaft.

Is it safe to drive?

A P0340 code can cause the engine to stall, run very poorly, or not start at all. Driving with this issue can lead to unreliable operation and potential engine damage if timing is severely off. It's best to avoid driving until repaired.

Most likely causes

• Faulty Camshaft Position Sensor

  high

  The sensor itself can fail, providing an intermittent or no signal to the PCM.

• Wiring Harness Issues (open, short, corrosion)

  medium

  Damaged wires or corroded connectors can prevent the sensor signal from reaching the PCM.

• Damaged Reluctor Wheel/Tone Ring on Camshaft

  low

  If the metal wheel the sensor reads is damaged or misaligned, it can cause an incorrect signal.

• Timing Chain/Belt Issue (stretched, jumped a tooth)

  low

  If the timing is off, the camshaft position will not correlate correctly with the crankshaft, triggering this code.

Related help

• Full P0340 diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?