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P0340 Error Code : Causes, Symptoms, Severity, Fix and Cost

  • Cars Explained
  • Natasha Young
  • 5 minutes

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Camshaft position sensors are critical to the electrical system in a vehicle. This sensor requires a complex network of electrical connectors and wiring to function, so there could be numerous points of failure in the system. Error code P0340 needs fixing right away and in this blog, we have everything you need to know about P0340. 

What is P0340? 

In order to determine the camshaft’s rotational speed and where it is in relation to other parts of the engine, the camshaft position sensor uses the camshaft’s rotation. The PCM receives this data from the camshaft sensor via a signal sent to the PCM.  

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To regulate the timing of fuel injectors and spark plug ignition, the PCM uses data collected by the camshaft position sensor. The P0340 code will be stored in the PCM if the signal between the camshaft position sensor and the PCM is disrupted. This will cause the Check Engine Light to come on. 

A P0340 error code indicates a problem with the Camshaft Position Sensor A circuit. It’s possible that the wires leading to the camshaft position sensor are faulty, or that the sensor itself has failed. This error code isn’t a sign of bad camshaft timing. 

P0340 Causes 

  • A defective camshaft position sensor 
  • Damaged or dirty reluctor ring on the camshaft 
  • Defective, corroded, shorted camshaft position sensor circuit wiring 
  • Defective, corroded, shorted camshaft position sensor circuit connector 
  • A faulty crankshaft position sensor 
  • Stretched or misaligned timing components 
  • ECM software update needed 
  • Faulty ECM 

P0340 Symptoms 

  • Check Engine Light 
  • The vehicle will not start – may be difficult to start 
  • Rough idle/stall 
  • Vehicle engine misfire 
  • Loss of power when driving 

How serious is the P0340 Code? 

This is a serious diagnostic trouble code. A problem with the car’s ignition could cause it to fail to start. The driver may also feel a lack of power while driving. The driver and anyone else on the road are in danger because of these symptoms, which make the vehicle unsafe to operate. If you ignore the P0340 error code for too long, you run the risk of causing damage to other engine components. Diagnosing and fixing the P0340 error code as soon as possible is critical. 

P0340 Code: Camshaft Position Sensor Issue

How to diagnose the P0340 code? 

  • Connect an OBD2 scanner and look for any trouble codes related to this issue. Try deleting the code and see if it reappears. 
  • If the code comes up, you’d have a choice between two options. If you’ve never measured the camshaft position sensor before, it can be a challenge. Camshaft position sensor A can either be measured by finding the correct ohm values or by checking the signal with an oscilloscope. 
  • Sensors for camshafts are inexpensive and simple to replace. So, you have to decide whether or not you’re willing to take the risk. In fact, a bad camshaft sensor is the most common cause of this error code. 
  • You must measure and inspect the wiring between the engine control module and the sensor if the trouble code returns after you have measured or replaced the sensor.  
  • Remove the sensor and the engine control unit from the vehicle. Make sure there aren’t any connections to the ground or between the wires. 
  •  If the wiring appears to be in order, the only other possibility is that the engine control unit has gone bad. You should make sure that the engine control unit is the problem before you spend a lot of money on a new one. If you’re an experienced mechanic, you can check the 5v+, ground, and signal to come from the engine control unit. 

What repairs can fix the P0340 code? 

  • Repairing or replacing the camshaft position sensor circuit wiring 
  • Repairing or replacing the camshaft position sensor circuit connector 
  • Replacing the camshaft position sensor 
  • Replacing the crankshaft position sensor 
  • If misfire codes are present, perform a tune-up of the vehicle before replacing the camshaft position sensor 
  • Replacing or reprogramming the PCM  

How much does it cost to fix code P0340? 

P0340 can be caused by a wide range of issues, from bad wiring to a faulty sensor to a faulty ECM. For an accurate estimate, you must first thoroughly investigate the problem. An hour of “diag time” is standard practice when you take your car to a mechanic (the time spent in labor diagnosing your specific issue).  

You’re looking at a range of $75-$150, depending on the shop’s hourly rate. A diagnostic fee is often included in the cost of repairs if you hire a shop to do the work for you. Repairs for your P0340 code can be estimated from this point onward by a shop. 

Possible repair costs for P0340 

To fix error code P0340, one or more of the following fixes may be required. Estimated repair costs include both the cost of the repair parts and the cost of the labor needed to complete the repair. 

  • Camshaft position sensor $120-$300 
  • Crankshaft position sensor $190-$250 
  • ECM $1000-$1200 
  • Timing chain or belt replacement $200-$1000 

Common mistakes when diagnosing the P0340 code 

First, it is critical to inspect the wiring and connections to rule them out as the source of the problem before replacing the camshaft sensor. Diagnosing the P0340 error code can be tricky if you don’t know what to look for. Another common mistake during the diagnostic procedure is overlooking the possibility of a misfire or a crankshaft sensor problem. 

The P0340 error code is extremely difficult to identify. Do a thorough review of the system before making any final decisions. In addition, make certain that you are performing repairs or replacements on the correct part. 


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