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.

P0340 Symptoms*

  • 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

P0340 Causes

  • 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.

P0340 Diagnosis

Difficulty of Diagnosis and Repair – (6-10)

  1. Visually inspect the camshaft position sensor wiring in search of corroded, broken, and continuity of wiring.
  2. Visually inspect the camshaft position sensor connector in search of corroded or broken connectors.
  3. Visually inspect the camshaft position sensor circuit wiring in search of corroded, broken, and continuity of wiring.
  4. Make any other repairs (if other codes are present) to make sure that other codes are not sources of the trouble code P0430.
  5. Check your camshaft position sensor voltage readings. Check out this video for a visual reference on how to check it using your multimeter.
  6. 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.
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Comments 10

Jeff Tracy

September 5, 2018

Is this electronic sensor located on the exterior of the engine and something I can replace, I do have a multi-meter…. how much does the sensor cost ?

Fix it 4 free

November 6, 2018

I have a Kia and it was a broken wire just at the harness. I fixed it for free and it solved the problem.

Chris Hart

September 15, 2018

I got the error code and my wife went on line for info. It was crankshaft position sensor.
Got a replacement at O’Rielly’s and I was able to replace it. We are glad to have had FIXD TO HELP US.

Thomas krchelich

September 23, 2018

I have codes po340 and code p0341 I changed the camshaft position sensor the one on top of motor and the one on bottom it’s still throwing those two codes wires are OK please help what the hell is it

Thomas Krchelich

September 23, 2018

I have a 2011 terrain 2.4 or whatever it is it’s throwing p0340 and p0341 I changed both sensors and it still stalls out and throws the codes I can have my wife and grandkids riding around in a car that stalls on the road any help would be appreciated

Donald Gardner

September 26, 2018

My 1999 Dodge Intrepid 3.2 engine stalled. I restarted it but the engine light was on. I plugged in my FIXD and got the error code meaning that the camshaft position sensor was the cause of the trouble. I went to O’Rielly’s and picked up a new one. After replacing the sensor, I was able to clear the engine light and have not had any further problems. FIXD was accurate in the diagnosis and saved me a lot of money.

FIXD Marketing

September 26, 2018

That’s awesome Donald! Glad we could help.

Thanks, FIXD Team


October 27, 2018

I have a 2012 gmc terrian that is throwing po341 and po340 it stalls when stopped at sings and lights seems like its not got enough fuel dies but does start back up


November 12, 2018

2010 Chevy Traverse, turning off highway into drive Car just died. Pushed it to the house noticed battery was old replaced the following day. Ran FIXD no errors came up and car doesn’t turn over. I’ve re-search the issue and timing belt may be the issue, b4 I go that far what are some other signs?

Donald Boue

December 7, 2018

i have a Saab 9-3 , arc convertible 2005 code reads po340, i changed crankshaft posiyion sensor and spark plugs, now a still have mild miss when idleing