P0340 – Meaning, Causes, Symptoms, & Fixes
Code P0340 Definition
Camshaft Position Sensor Circuit Malfunction
What Does P0340 Mean?
The camshaft position sensor located in the internal combustion engine, monitors position and rotational speed of the camshaft. The sensor sends this information to the Power Control Module (PCM) and the PCM uses this information to control ignition spark and fuel injector timing. When the trouble code P0340 is set, the ignition spark and fuel injector timing fails due to a number of reasons.
- Check Engine Light
- Vehicle will not start – may be difficult to start
- Rough idle/stall
- Vehicle engine misfire
- Loss of power when driving
*In many cases there may be no noticeable issues with your vehicle
- Faulty PCM
- Defective, corroded, shorted camshaft position sensor circuit wiring
- Defective, corroded, shorted camshaft position sensor circuit connector
- Defective camshaft position sensor
- Faulty crankshaft position sensor
Code P0340 Severity – Severe
The vehicle may be difficult to start and the driver may also experience a lack of power when driving. It is possible for more damages to occur inside of the engine of the vehicle if disregarded for an extended time period. It is extremely important to repair code P0340 as soon as possible.
Code P0340 Common Diagnosis Mistakes
Replacing the camshaft position sensor without checking the wiring and connectors beforehand. There may also be the possibility of neglecting the possibility of a misfiring problem that may be possible sources.
Difficulty of Diagnosis and Repair – (6-10)
- Visually inspect the camshaft position sensor wiring in search of corroded, broken, and continuity of wiring.
- Visually inspect the camshaft position sensor connector in search of corroded or broken connectors.
- Visually inspect the camshaft position sensor circuit wiring in search of corroded, broken, and continuity of wiring.
- Make any other repairs (if other codes are present) to make sure that other codes are not sources of the trouble code P0430.
- Check your camshaft position sensor voltage readings. Check out this video for a visual reference on how to check it using your multimeter.
- If these steps do not clear your Check Engine Light, you may need to visit a mechanic because there may be internal issues with the PCM, ECM, etc.