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P0021 Fault-Error code Camshaft position (CMP) timing forward

Updated: Oct 4

What is P0021 Fault/Error code?


The P0021 Fault/Error code is an error code generated by a car's engine control system and usually indicates problems with the camshaft position actuator or camshaft position sensor. This error is logged by the OBD-II (On-Board Diagnostics - Second Generation) system.


P0021

Meaning of Fault/Error code P0021:


The Fault/Error code P0021 indicates that the car's engine control unit (ECU) has detected a problem with the camshaft position actuator or camshaft position sensor and that these components are not functioning properly in their desired position.



What causes the P0021 Fault/Error code:


The P0021 Fault/Error code can usually occur for the following reasons:

  1. The camshaft position actuator is defective.

  2. The camshaft position sensor is defective.

  3. The camshaft position actuator or sensor connections are loose or corroded.

  4. Damage or rupture of the camshaft position actuator or sensor cables.

  5. The oil flow control valve is defective.

  6. Problems with the timing chain or gears.



Symptoms of Fault/Error code P0021:


The Fault/Error code P0021 can be manifested by the following symptoms:

  • Erratic operation or vibration of the engine.

  • Loss of power and loss of performance.

  • Increase in fuel consumption.

  • Abnormal sounds coming from the exhaust.

  • Check Engine Light comes on.



How to detect P0021 Fault/Error code:


The P0021 Fault/Error code can be detected using an OBD-II scanner or error code reader. These devices can read error codes from the vehicle's ECU.


How serious is the P0021 Fault/Error code:


The P0021 Fault/Error code may affect the proper operation and performance of the engine. It can also signal problems with the timing chain or gears, which can lead to more serious damage. Therefore, this error should be taken seriously and it is important to fix it.



Solution of Fault/Error code P0021:


The resolution of the P0021 Fault/Error code may include the following actions:

  • Replacement of the camshaft position actuator or sensor.

  • Checking and repairing actuator or sensor connections.

  • Actuator or sensor cables are checked and, if necessary, repaired or replaced.

  • Replacement of the oil flow control valve (as needed).

  • Checking the timing chain or gears and replacing them as needed.



These types of repairs often require a mechanical skill and may require the help of a professional auto service.


Things to evaluate regarding the P0021 Fault/Error code:


  • It is important to contact an auto service or use an OBD-II scanner to determine what the error code is caused by.

  • The error code should not be neglected, as this can have negative effects on the performance and reliability of your vehicle.

  • Once the cause of the error code has been identified, it is important to make the necessary repairs.



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