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P0025 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.


A special DTC code that gives information about a particular problem within the vehicle’s engine system is P0025. It relates specifically to the “Camshaft Position B – Timing Over-Retarded” in the engine. The code, which allows technicians to identify the issue more easily, is standardized and recognized for each vehicle type and model.


The DTC code P0025 applies to “Camshaft Position B + Timing Overretardation” in the engine. It typically indicates a problem with the exhaust camshaft position actuator control circuit. Vehicles equipped with a variable valve timing system for VVTs are commonly found to have this code. The VVT system allows the engine to be optimized through valve timing adjustments depending on a number of factors.


When a vehicle’s onboard computer detects a problem with the camshaft position timing, it will trigger a diagnostic trouble code (DTC) P0025. This code indicates that the exhaust (B) camshaft position timing is over-retarded on bank 2. There are several possible causes of this issue, including mechanical and electrical issues.

Mechanical Issues

The variable camshaft timing (VCT) piston and phaser, as well as continuous oil flow to the VCT piston chamber, are all mechanical difficulties that may result in the P0025 code. This code may also display if the VCT oil control valve (OCV) is stuck in the open position.

Electrical Issues

The wiring of the intake timing control valve control solenoid system, a defective timing valve control solenoid that is jammed open, an open or shorted circuit in the VVT or OCV circuits, and other electrical faults can all result in the P0025 code. This code may also show up if the engine control module (ECM) is broken.

It’s crucial to keep in mind that severely low engine oil levels might also result in the P0025 error code. This is due to the fact that the VCT system needs a consistent flow of oil to operate effectively. This code may appear if the oil level is too low because it may interfere with the VCT system and create problems.

In summary, the P0025 code can be caused by a variety of mechanical and electrical issues, including problems with the camshaft phaser, VCT piston and phaser oil flow, wiring issues, and faulty solenoids. It’s important to diagnose and fix the underlying issue causing this code to prevent further damage to the engine and ensure the vehicle runs properly.


The exhaust (B) camshaft position timing over-retarded (Bank 2) problem is when the engine control module (ECM) notices a fault and sets off the P0025 diagnostic trouble code (DTC). Following are some signs that a motorist could encounter if their car gets the P0025 DTC code:

  • The check engine light will illuminate the dashboard. 
  • The engine may have difficulty starting or stall unexpectedly. 
  • The engine may run roughly or have reduced power. 
  • The vehicle may have poor fuel economy. 
  • The vehicle may emit excessive exhaust emissions.

It is essential to remember that some of these symptoms can also be brought on by other car problems. Therefore, before doing any repairs, it is imperative to have the issue identified by a qualified technician.

The P0025 DTC code occasionally appears with other codes that have to do with the engine’s camshaft position or timing. P0010, P0011, P0013, P0014, P0020, P0021, P0023, and P0024 are some examples of these codes. Multiple codes might point to a more complicated issue with the engine’s camshaft system.

If left unaddressed, a P0025 DTC code can lead to further engine damage and potentially costly repairs. Therefore, it is crucial to have the issue diagnosed and repaired as soon as possible to prevent further damage to the engine.


When a vehicle’s check engine light comes on, it can be an indication of a variety of issues. One possible cause is the P0025 diagnostic trouble code. To diagnose and test this code, a mechanic must perform a visual inspection and use diagnostic tools.

Visual Inspection

The first step in diagnosing the P0025 code is a visual inspection of the engine. The mechanic should check for any obvious signs of damage or wear on the camshaft position sensor, the wiring, and the connectors. They should also check for any loose connections or broken wires.

Diagnostic Tools

A mechanic will require diagnostic equipment to conduct a more thorough analysis of the P0025 code. An OBD-II scanner will be their first tool. This scanner will read the code and give details on the particular problem that caused it.

Once the problem has been located, the technician might need to employ more diagnostic equipment to determine its precise cause. For instance, they would need to use a multimeter to verify the camshaft position sensor’s voltage and resistance.

A test drive may occasionally be required by the mechanic to determine whether the problem is still present. They can use this to evaluate if the issue is ongoing or sporadic.

Overall, a mix of eye inspection and diagnostic tools is needed to identify and evaluate the P0025 error code. It should be simple for a mechanic with knowledge of diagnosing and fixing engine problems to locate the issue and offer a fix.

Common mistakes

  • Ignoring the P0025 code: One common error is that, especially when there are no obvious symptoms or problems with performance, you need to ignore this code. In the longer term, it may lead to possible complications such as a reduction in fuel economy or engine damage if this code is not followed.
  • Failing to diagnose related components: an additional error is that it focuses only on the camshaft position actuator, but does not take into account other parts of the VVT system. The inspection and testing of any related components, such as the timing chain, oil pressure, sensor, or electrical connection, shall be essential.

Failure to carry out regular maintenance: The occurrence of the P0025 code can be related to neglecting routine maintenance, e.g., oil changes. The correct operation of VVT systems may be hampered by dirty or damaged engine oil, which can lead to problems and the introduction of a DTC.

How serious is this?

The cause of the P0025 code, as well as vehicle type and model, have a great influence on its severity. This may not lead to an immediate breakdown, but it is still a problem that should be dealt with swiftly. It can damage the engine for a prolonged period of time or reduce its performance if left unattended. In order to prevent further complications, it is recommended that professionals be contacted for advice on the diagnosis and correction of the problem.

What repairs can fix the code?

repair manuals

DIY Solutions

When dealing with a P0025 DTC code, there are a few DIY solutions that car owners can try before seeking professional assistance. These solutions include:

  • Check the oil level and quality: Low oil levels or dirty oil can cause issues with the camshaft timing. Ensure that the oil level is correct, and consider changing the oil if it is dirty.
  • Inspect the wiring: A damaged or loose wire can cause issues with the camshaft timing. Inspect the wiring and connectors to ensure they are in good condition.
  • Replace the timing valve control solenoid: If the solenoid is stuck open, it can cause issues with the camshaft timing. Replace the solenoid to see if it resolves the issue.

Professional Assistance

If the DIY solutions do not resolve the issue, it may be time to seek professional assistance. A mechanic can perform a thorough diagnosis to determine the root cause of the P0025 DTC code. They may recommend the following repair or replacement options:



Camshaft position sensor replacement

If the sensor is faulty, it can cause issues with the camshaft timing. Replacing the sensor can resolve the issue.

Timing belt replacement

If the timing belt is worn or damaged, it can cause issues with the camshaft timing. Replacing the timing belt can resolve the issue.

Engine control module replacement

If the engine control module is faulty, it can cause issues with the camshaft timing. Replacing the module can resolve the issue.

Related codes

The P0025 DTC may also contain or trigger a number of related codes. In order to help determine the root cause of this issue, these codes often provide useful clues. There are some common related codes, which include:

  • P0024: Camshaft Position B – Timing Over-Advanced or System Performance (Bank 2)
  • P0019: Crankshaft Position – Camshaft Position Correlation (Bank 2 Sensor B)
  • P0016: Crankshaft Position – Camshaft Position Correlation (Bank 1 Sensor A)

All of them relate to various parts of the engine’s timing and synchronization. In order to identify a malfunctioning component and simplify the diagnostic process, an understanding of the relationship between these codes can be helpful.


In conclusion, the P0025 DTC code is a widespread problem that may affect a variety of automobiles. This error code refers to excessively delayed exhaust (B) camshaft position timing on bank 2. Numerous symptoms might result from it, such as a rough idle, poor fuel economy, and diminished engine power.

The timing of the camshaft, wiring issues, continuous oil flow into the VCT piston chamber, and a malfunctioning timing valve control solenoid are a few of the potential reasons for the P0025 code. To prevent additional harm to the engine, it is crucial to identify and address the underlying problem that is triggering the code.

It is advised that you take your car to a reliable technician or dealership for an accurate diagnosis and repair if you notice any symptoms associated with the P0025 code. To identify the problem’s underlying cause and offer a dependable fix, they might make use of specialist diagnostic tools and techniques.

Overall, it is important to pay attention to the P0025 DTC code since it may indicate a major problem. Understanding its origins and symptoms can help you prevent future costly repairs and maintain the smooth operation of your car.

P0025 Code – What Does It Mean & How To Fix It