P0343 - CAMSHAFT POSITION SENSOR "A" CIRCUIT LOW

POST UPDATED IN October, 2020

Description of DTC code P0343 Generic

The CMP sensor (camshaft position sensor) responds to a sprocket on the camshaft. The function of the sensor is to provide the PCM (Powertrain Control Module) with information about the speed and position of the camshaft.

This diagnostic code is set when the PCM detects a high resistance. It is worth mentioning that there are vehicle models that have two Camshaft Position Sensors. But in this case, the DTC code P0343 OBDII refers to sensor A.

Symptoms of fault code P0343 Generic

  • Malfunctioning light (MIL) on.
  • The engine may not start or there are difficulties in starting.
  • Abrupt motor operation.
  • Poor acceleration.

Causes of OBD2 P0343 Generic

The reasons to establish the diagnostic code P0343 OBD2 are

  • The ground circuit of the Camshaft position sensor (CMP) may be shorted.
  • The signal circuit between CMP sensor and open
  • CMP sensor cables in bad condition.
  • The camshaft position sensor is probably defective.

Possible solutions of the DTC code P0343 Generic

The steps to follow to solve the problems of the fault code P0343 OBD II are as follows:

  • Visually, inspect the CMP sensor. Check that it's properly connected. Also, check all cables related to the sensor for damage such as wear or corrosion, repair, or replace as necessary.
  • Perform a test on the resistance of the Camshaft position sensor. If you get 0 ohms as a result, the sensor is probably defective.
  • Check the signal with an oscilloscope. If you don't have access to one you can put the multimeter in CAV mode, after powering up there should be 20 mV.
  • Change the CMP sensor.

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