What the OBD-II code p0340 means

Fault code P0340 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P0340 – Camshaft Position Sensor Circuit Malfunction
P0340
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P0340: causes, symptoms and repairs

The meaning of fault code P0340

P0340 is triggered by the engine control unit (ECU) when it detects a problem with the camshaft position sensor (CPS) circuit. The purpose of the CPS is to monitor the position and speed of the camshaft. It then transmits this information to the power control module (PCM). Based on this data, the PCM will regulate the formation of ignition sparks and the timing of the fuel injectors. If something interferes with the data transmission or the sensor malfunctions, the ignition process will be disrupted.

Common causes

  • CPS faults, such as a short or broken circuits and a damaged internal coil
  • Damaged or corroded wires and connectors
  • A defective PCM
  • Sensor installation errors, causing transmission failure
  • Oxidised electrical contacts
  • Problems with the timing components
Symptoms of code P0340

  • The check engine light is on
  • The engine runs rough
  • A loss of engine power
  • Stalling or misfiring
  • Poor acceleration
  • Starting difficulties
Recommended repairs

Checking the components:

  • Inspect all of the wires and connectors for the device to make sure that there are no connectivity or conductivity issues.
  • Check the DTCs by scanning the onboard computer with an OBD2 scan tool. The codes will help you to diagnose the problem. There could be more than one underlying cause, and the quicker they are identified, the quicker you will be able to remove the error. If you are unable to decipher them, there are several informative resources available on this topic online.
  • Check the voltage of the camshaft position sensor using a digital multimeter. If the voltage is too low or no voltage is detected, there could be a problem with the device itself or a broken circuit. You can also test its signal output with an oscilloscope.

Fixing the components:

  • Replacing the power cable and defective connectors can help to restore electrical power supply to the CPS and the transmission of important camshaft data.
  • Sometimes the connectors can be repaired by removing contaminants and traces of oxidation using a specialised electrical contact cleaner for improved conductivity.
  • If the device fails and cannot be repaired using these simple methods, the best option would be to replace it with a new one.
Frequently Asked Questions (FAQ)

What does the P0340 code mean?


It means that there is something wrong with the camshaft position sensor.

How do I clear the error?


Firstly, you can reset the DTC using an OBD2 scanner. If it appears again after a test drive, proceed with the diagnostic checks. The problem will need to be resolved before the error can be removed permanently.

How much does it cost to fix?


It depends on the repair methods required and parts that need to be replaced. You normally expect to pay around £85 to £175 for a CPS replacement, although the devices themselves can be bought at very reasonable prices. DIY repairs and replacements are often more economical, however, it is important to bear in mind that some vehicles are more complex than others.

Can I still drive if there is a P0340 fault?


This would not be wise. CPS malfunctions can cause the engine to stop working properly, resulting in stalling and other issues. The instability of the engine will increase the risk of a road accident.

Cars the fault code P0340 is most commonly found on

Fault code P0340 - Camshaft Position Sensor Circuit Malfunction can occur with any car but is most often found on the following cars:

  • Nissan: Micra, XTrail, Juke
  • Ford: Fiesta, Focus, KA
  • Vauxhall: Astra, Corsa, Zafira
  • BMW: E36, E46, E39
  • Fiat: 500, Doblo, Ducato
  • Hyundai: Santa fe, I10, Tucson

If you get the code P0340 on your car, make sure that the diagnostics are carried out correctly and the error is still relevant. Check for symptoms associated with the problem and explore options for resolving it.

What to do if the fault code p 0340 appears

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