P0344 Camshaft Position Sensor Intermittent - Bank 1 Sensor 1

Possible Causes code P0344 Camshaft Position Sensor Intermittent - Bank 1 Sensor 1

  • Low engine oil level.
  • Engine oil aerated or contaminated.
  • Incorrect engine oil filter.
  • Insufficient oil pressure due to a mechanical failure in the oiling system.
  • 5-volt supply circuit shorted to voltage.
  • 5-volt supply circuit open.

P0344 Camshaft Position Sensor Intermittent - Bank 1 Sensor 1


P0344 Camshaft Position Sensor Intermittent - Bank 1 Sensor 1

  • 5-volt supply circuit shorted to ground.
  • 5-volt supply circuit shorted to the sensor ground circuit.
  • CMP 1/1 signal circuit shorted to voltage.
  • CMP 1/1 signal circuit shorted to ground.
  • CMP 1/1 signal circuit shorted to the sensor ground circuit.
  • CMP 1/1 signal circuit open/high resistance.
  • Sensor ground circuit open/high resistance.
  • Camshaft position sensor.
  • Camshaft tone wheel loose/damaged or misaligned.
  • Camshaft 1/2 oil control valve faulty or intermittently binding/sticking spool valve.
  • Camshaft 1/2 phaser faulty or intermittenly binding/sticking.
  • Powertrain Control Module (PCM).
  • Oil pressure issue in cylinder head.


Diagnose code P0344 Camshaft Position Sensor Intermittent - Bank 1 Sensor 1


(Step 1-6, see code P0394)
Step 1. Check the engine oil level and condition
Step 2. Check for an active DTC
Step 3. Other cam sensor DTC active
Step 4. Check the 5-volt supply circuit
Step 5. Check the sensor ground circuit for an open or high resistance
Step 6. Camshaft position sensor 1

(Step 7-11, see code P0369)
Step 7. Check the CMP 1/1 signal circuit for a short to voltage
Step 8. Check the CMP 1/1 signal circuit for a shorted to ground
Step 9. Check for the CMP 1/1 signal circuit shorted to the sensor ground circuit
Step 10. Check the CMP 1/1 signal circuit for an open/high resistance
Step 11. Camshaft Position Sensor

(Step 12-14, see code P0349)
Step 12. Check the engine oil pressure and engine mechanical condition
Step 13. Check the camshaft 1/2 oil control valve operation
Step 14. Check related PCM and component connections

Step 15. Powertrain Control Module

Replace the Powertrain Control Module (PCM). Perform the Powertrain Verification Test. Turn the ignition on, with the scan tool, erase DTC. Start the engine and allow it to idle or crank the engine if it will not start. With the scan tool, read DTC.

Did the CMP sensor DTC return?

YES, go to step 16.

NO, repair is complete.

Step 16. Inspect camshaft sensor tone wheel

Remove the cylinder head cover and inspect the camshaft sensor tone wheel for any looseness or signs of damage. Check the alignment of the CMP sensor tone wheel in accordance with the service information.

Were any issues found with the CMP sensor tone wheel?

YES, replace the camshaft assembly.

NO, go to step 17.

Step 17. Camshaft and phaser assembly

Replace the camshaft and the cam phaser. Turn the ignition on, with the scan tool, erase DTC. Start the engine and allow it to idle or crank the engine if it will not start. With the scan tool, read DTC.

Did the DTC return?

YES, replace the cylinder head.

NO, repair is complete.

Step 18. Wire harness/ CKP sensor inspection

Turn the ignition off, disconnect the harness connectors at the PCM and cam sensor. Inspect for wire chaffing or rub conditions, spread terminals, terminals pushed out of the wiring connector, bent terminals at the PCM and cam sensor, water in the connector cavities, presence of corrosion on the terminals of the connectors or components.

Visually inspect the mounting area of cam sensor for debris/damage or a loose sensor. Remove the cam sensor and inspect the end of the sensor for signs of damage or debris. Rotate the engine and if possible, inspect the tone wheel for any signs of damage. Reinstall the cam sensor and ensure that the sensor is properly installed and torque to proper specification.

Note: Due to the fact that this DTC is set by an intermittent loss of the signal, the most likely cause is a poor connection at the Cam Sensor or PCM terminals, or a poor signal between the Cam Sensor and tone wheel. Because of this, unplugging and reconnecting the harness connectors, or repositioning the Cam Sensor will often repair the condition that set the DTC.

Were any problems found?

YES, perform the appropriate repair.

NO, go to step 19.

Step 19. Check the vehicles repair history

Check the history of the vehicle for previous cam sensor related DTC  within the past 90 days.

Did the repair history show that the vehicle was in dealership for a cam sensor fault within the past 90 days?

YES, replace the cam sensor. Using the scan tool, perform the '' Cam/ Crank relearn'' procedure.

NO, test complete. Reconnect the harness connectors, and erase the DTC. The most likely cause was a poor connection at one of the harness connectors. Verify the DTC does not return.

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