Fault code P0015 – a step-by-step guide to diagnosing and fixing it

Error code P0015 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system uses DTC P0015 to detect a malfunction in the camshaft phasing system on the intake side of bank 1. This trouble code indicates that the camshaft is being phased too late or that the Variable Valve Timing (VVT) system is not working properly. For various manufacturers, this trouble code may also be referred to as "Camshaft Position 'B' - Timing Over-Retarded (Bank 1)".

What can cause this error code?

• Defective camshaft phasing valve (VVT solenoid)
• Clogged or dirty oil filter
• Low engine oil level or incorrect engine oil
• Defective camshaft sensor
• Damaged or stretched timing chain tensioning system
• Blocked oil ducts in the camshaft phasing unit
• Defective camshaft phaser (phaser)
• Electrical problems in the wiring to the VVT system
• Faulty engine control unit (PCM/ECU)

What symptoms occur in parallel with fault code P0015?

• Loss of power: The engine noticeably loses power, especially at higher engine speeds
• Uneven engine running: The engine runs unevenly and jerks when idling
• Starting problems: The vehicle is difficult to start or takes longer to start
• Increased fuel consumption: Fuel consumption increases significantly due to poor engine tuning
• Knocking noises: Metallic knocking or rattling noises from the engine compartment
• Exhaust problems: Increased emission values and possible failure of the emissions test

How can the problem with error code P0015 be rectified?

• Repairing fault code P0015 requires a systematic approach to identify the root cause.
• Change the oil to the correct specification: Change the engine oil and oil filter, making sure to use the oil viscosity specified by the manufacturer, as incorrect oil impairs the VVT function
• Replace the VVT solenoid valve: Remove the camshaft phasing valve, clean it or replace it completely if it is defective, as it is often blocked by oil contamination
• Check and replace camshaft sensor: Test the sensor for proper function and replace if the signal values are faulty
• Check timing chain and tensioner: Check the entire timing chain tensioning system for wear and replace if necessary
• Replace the camshaft phaser: If the phaser is mechanically defective, replace it completely, as repair is usually not possible
• Clean the oil ducts: Flush the oil supply to the VVT system and remove any deposits
• Check the electrical wiring: Check all cable connections to the VVT system for damage, corrosion or loose plug connections