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P0366 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


P0366 is a diagnostic trouble code, “DTC,” which refers to an issue with the Camshaft Position Sensor B circuit range and performance. This code is part of the On-Board Diagnostics II (OBD-II) system used in modern vehicles to monitor and report problems with various engine components.


The code P0366 indicates the engine control module ECM has detected a failure of the Camshaft Position Sensor “B” circuit’s range or performance. This sensor is necessary for the engine control unit to measure camshaft location and timing, which are essential to keeping an engine running properly.


A P0366 code may appear as a result of many circumstances, such as:

  • A broken camshaft position sensor type “B.”
  • difficulties with the Camshaft Position Sensor “B” circuit’s wiring or connectors.
  • An erroneous camshaft.
  • Issues with the timing chain or belt.
  • Rarely, there are ECM problems.


The following list of symptoms is typical for a P0366 code:

Illumination of the dashboard’s Check Engine Light (CEL).

  • Reduced engine power or performance as a result of improper camshaft timing.
  • A poor fuel economy.
  • Misfires or harsh idling of the engine.
  • Difficulties starting the engine or stalling.


A mechanic or technician will often take the following actions to troubleshoot a P0366 code:

  • To get the code and any associated codes, use an OBD-II scanner.
  • Look for any obvious damage to the Camshaft Position Sensor “B” and its connections.
  • Check the voltage and resistance of the sensor to see if it is operating properly.
  • Examine the camshaft and timing parts for wear and good alignment.
  • If the issue reappears after clearing the code and running a test drive, it may be a permanent issue.

Common mistakes

Common mistakes when dealing with a P0366 code include:

  • Replacing the sensor without checking the wiring and connectors for issues.
  • Neglecting to inspect the camshaft and timing components for problems.
  • Assuming the code is solely caused by a faulty sensor without considering other potential causes.

How serious is this?

The code P0366 shall be resolved immediately because it may result in reduced engine performance, low fuel economy, and possible damage to the engines that have not been solved. It is recommended that any vehicle should be checked and repaired as soon as possible if it remains able to drive.

What repairs can fix the codeS?

repair manuals

Repairs for a P0366 code may include:

  • Replacing the Camshaft Position Sensor “B” if it’s found to be faulty.
  • Repairing or replacing damaged wiring or connectors in the sensor circuit.
  • Realigning the camshaft if it’s found to be misaligned.
  • Addressing any issues with the timing belt or chain.
  • In rare cases, replacing the ECM if it’s determined to be the source of the problem.

Related codes

Related codes may include:

  • P0360 – Camshaft Position Sensor “B” Circuit Malfunction.
  • P0361 – Camshaft Position Sensor “B” Circuit Range/Performance.
  • P0362 – Camshaft Position Sensor “B” Circuit Low Input.
  • P0363 – Camshaft Position Sensor “B” Circuit High Input.


The DTC P0366 indicates that there is a problem with the range and performance of the Camshaft Position Sensor “B” circuit, which may affect engine performance and efficiency. To avoid additional damage and make sure that the vehicle operates effectively, timely diagnosis and repair are necessary. Depending on the specific cause of the code, repairs may include sensor replacement, wiring repair, camshaft examination, or timing component adjustments.

P0366 Code – What Does It Mean & How To Fix It