Fault code P0018 – a step-by-step guide to diagnosing and fixing it

Error code P0018 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a deviation in the camshaft position. The DTC P0018 indicates that the camshaft of the exhaust valves (bank 2) is not correctly synchronized with the crankshaft. This error code can occur with different manufacturers, although the exact definition can vary slightly depending on the vehicle brand.

What causes can this error code have?

• Defective timing chain or timing belt
• Worn chain tensioner or guide rails
• Defective camshaft sensor (bank 2, exhaust side)
• Faulty crankshaft sensor
• Damaged wiring to the sensors
• Loose or corroded plug connections
• Skipped timing chain due to wear
• Defective variable valve timing (VVT)
• Low engine oil level or incorrect engine oil
• Mechanical problems with the valve train

What symptoms occur in parallel with fault code P0018?

• Starting problems: The vehicle is difficult to start or starts irregularly
• Loss of power: Significantly reduced engine power while driving
• Uneven idling: Engine runs unevenly or rough at idle speed
• Metallic noises: Rattling or rattling noises from the engine compartment
• Increased fuel consumption: Noticeably higher consumption than usual
• Jerking when accelerating: Uneven engine running under load
• Exhaust problems: Increased emission values or black smoke

How to fix the problem of error code P0018?

• The repair requires a systematic diagnosis, as several components may be affected.
• Check engine oil and oil level: Check the oil level and top up with the correct viscosity if necessary, as low oil levels can affect the variable valve timing
• Inspect timing chain or timing belt: Remove covers and check condition of timing chain/timing belt and tensioners, replace completely if worn
• Test camshaft and crankshaft sensors: Check sensors for correct signals using a multimeter and replace defective sensors and wiring
• Clean plug connections: Check all sensor plug connections for corrosion, clean and replace if damaged
• Check variable valve timing: Test VVT system for correct function and replace the relevant components if defective
• Adjust timing mechanically: After repairs, readjust the timing using special tools and reset the engine control unit