P0340 Code Camshaft Position Sensor “A” Circuit Malfunction


Camshaft position sensors are the mandatory parts of your car. The camshaft position sensor requires the electrical connectors and the wiring connection to work accordingly. Due to various factors, some faults P0340 Code can occur in the camshaft position sensor that can adversely affect the other components of the vehicle. 

These faults can lead to serious issues to the engine of vehicle, if they are not attended quickly.

Definition of P0340 error code

The technical definition of DTC generated P0340 error code is Camshaft Position Sensor Circuit Malfunction.

Meaning of the error code P0340

The CPS is an electronic gadget that is normally used in a motor to effectively and rapidly record the rate at which the camshaft is turning. This data is essentially utilized by ECM (aka the Engine Control Module) that can control fuel infusion and start. Likewise, the camshaft position can detect the cylinder position. Aside from this, the sensor framework comprises of real sensor, static part and pivoting part. 

When the motor is running, the low and high pieces of the teeth cause the hole with the sensor to change. This is one reason why the changing hole makes the attractive field close to the sensor change. Thusly, the attractive field can make the voltage from the sensor change. At the point when the driving rod position sensor becomes out of commission, the camshaft position sensor gives various controls of the motor parts with the utilization of timing of chamber distinguishing proof signs. 


The primary function of the camshaft positioner is to calculate the rotational speed of the camshaft and the position of the camshaft during that period. The sensor then sends signals to the PCM to transmit all these data. The PCM use this information to set the timing of the fuel injector and controls the ignition spark.

When the signal is broken from camshaft positioner and the PCM, the timing of the ignition spark and the fuel injector mismatches and PCM will store the P0340 error code and will trigger the check engine light.

Possible causes of the error code P0340

  • Broken, shorted wire in the route circuit 
  • Faults in PCM
  • Open circuit
  • Faults in crankshaft position sensor
  • Faults in battery
  • Faults in starter motor
  • Bad or problematic electrical connection of the camshaft position sensor
  • Open or shorted harness of the camshaft position sensor 
  • Faults in the camshaft position sensor

Symptoms of the P0340 error code

  • Engine power loss
  • Rough running or misfiring of engine
  • No start or hard starting of engine
  • Engine stalls while starting
  • Check Engine light ON 

The severity of the P0340 error code

This is serious error code because it causes problems in vehicle while starting. User can experience loss of power while driving. This error code can also cause damage to other components of the vehicle, if this error code is unaddressed for longer period of time. So, it is advised that diagnose and repair this error code as soon as possible.

How to diagnose the P0340 error code?

If your vehicle is diagnosed with several problems, follow these steps to diagnose if P0340 error occurs.

If your vehicle is diagnosed with several problems, follow these steps to diagnose if P0340 error occurs.
  • The main thing that you need to do is to visually analyse all the connectors and wiring in the course circuit 
  • Check for strength in circuit wiring 
  • Check the activity or voltage of camshaft position sensor 
  • Replace the camshaft position sensor when required 
  • Supplant the circuit wiring or connectors when required 
  • Replace or analyse the PCM as required

How to fix the error code?

  • Repair or replace the camshaft position sensor circuit wiring if needed
  • Repair or replace the camshaft position sensor circuit connector if needed
  • Replace the camshaft position sensor if needed
  • Check and replace the crankshaft position sensor if needed.
  • Perform a tune-up of the vehicle before the replacement of camshaft position sensor, if you notice a misfire code.
  • PCM should be replaced or reprogrammed.

If your vehicle is diagnosed with P0340 error code, take your vehicle to the mechanic and get all issues solve as quickly as possible, because this error code can cause serious damage to your vehicle.

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