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P000B Fault Code (Causes & Fixes) "B" Camshaft Position Slow Response Bank 1

Updated: Jan 9

P000B is an OBD fault code that stands for "(B) Camshaft position slow response bank 1". This fault can occur for a variety of reasons.

A P000B trouble code means the camshaft's position varies from the position expected by the powertrain control module (PCM). The letter "B" shows that the problem is with the exhaust valves, and the word "Bank 1" shows that it is on the bank 1 side of the engine.

This code may be accompanied by a P0010 code, indicating that bank 1 is the cause of the problem.

The fault codes P000A, P000C, and P000D are also related. P0011, P0012, P0013, P0014, P0015, P0020, P0021, P0022, P0023, P0024, and P0025 are some more codes that may occur.

If a DTC is related to the powertrain, it will begin with the letter "P" when read by an OBD reader. Fault codes in the P0xxx format are generic fault codes.

Table of Contents:


The Meaning of a P000B Fault Code

Vehicle camshafts open and shut the intake and exhaust valves on the engine's cylinders to keep the engine running smoothly. The camshaft timing is critical for the engine to run properly.

The timing of this action is slower than anticipated when the vehicle's computer produces the OBD code P000B.

  • In this instance, the fault is with the exhaust valves in bank 1, as shown by the letter "B".

  • The intake valves are denoted by the letter "A".

The PCM (powertrain control module) maintains track of both the current and future positions of the camshaft.

The PCM identifies an insufficiency if the camshaft position change is less than it should be during the diagnostic phase. A P000B code will be set if the changes in response time persist over time.

Possible Causes of a P000B Code

Due to the large number of moving components in the engine and camshaft system, there are several possible causes for this code. The following are the most common causes for a P000B code.

  • A corroded or damaged connector, wire, or harness

  • A defective PCM or ECM

  • Camshaft position actuator solenoid failure

  • Camshaft position sensor failure

  • Fuel cap is loose

  • Oil pressure is low (due to blockage in the oil galleries, faulty oil pump, low oil level, etc.)

  • Timing chain or belt problems

  • VCT (variable cam timing) phaser failure

  • VCT unit binding

There are numerous issues that might be causing your vehicle to generate a P000B code.

Engine timing issues need the use of specialised equipment to evaluate the engine timing and precisely reset the timing when all repairs are completed.

Signs & Symptoms of P000B

Typically, the main indication of a P000B fault code is the illumination of the MIL (check engine light).

You may notice:

  • An increase or change in engine noise

  • Poor engine performance

  • Higher emissions

Other fault codes, such as P0010 or other codes, may occur with a P000B code.

Is It Serious?

The vehicle may seem to run well and without any visible major faults.

However, if the issue is not addressed immediately, significant damage to components such as the camshaft follower may occur, causing expensive future repairs.

It is advised to avoid driving the car until it has been diagnosed and fixed.

Diagnosing the P000B Trouble Code

The diagnostic procedure should begin with confirming the P000B code and correcting any previously set codes. Check the engine oil level and top it up if necessary.

The codes should then be cleared, and the vehicle should be checked again to determine whether the fault continues. If the code appears again, the following additional actions may be required.

  • Camshaft adjustment valve testing.

  • Check the camshaft position actuator solenoid.

  • Check the engine oil levels and compare them to the manufacturer's recommendations.

  • Check the engine oil pressure.

  • Using a professional OBD scanner, check for the diagnostic code.

  • Examine the camshaft advance mechanism visually.

  • Examine the oil passageways for obstructions.

  • Inspect the wiring and circuits visually for evidence of damage or corrosion.

Common Diagnostic Mistakes

Low oil pressure is often disregarded as the main cause of this error code, despite the possibility that the fault is with the camshaft mechanism or other components.

If any of the oil pump connections deteriorate or any of the channels get clogged, the decreased oil pressure may cause a camshaft position slow response code to be generated.

As a result, it's recommended checking the oil level and refilling it if necessary to see whether this resolves the problem.

Troubleshooting Steps