Fault code P0020 – a step-by-step guide to diagnosing and fixing it

Error code P0020 is displayed and the check engine light is on - what does this mean?

The OBD system detects a fault in the intake camshaft position actuator circuit of bank 2. This DTC P0020 relates to the variable valve timing (VVT) system and may have slightly different names for different manufacturers, but always affects the camshaft timing on the side of the engine opposite cylinder 1.

What causes can this error code have?

• Defective camshaft position actuator (VVT solenoid)
• Clogged or damaged oil strainer in the VVT system
• Insufficient oil pressure or incorrect engine oil
• Damaged wiring harness to the VVT solenoid
• Corroded or loose plug connections
• Defective camshaft phase adjuster
• Blocked oil ducts in the cylinder head
• Faulty engine control unit (ECM/PCM)

What symptoms occur in parallel with fault code P0020?

• Uneven idling: The engine runs unevenly or roughly when idling
• Loss of power: Noticeable reduction in engine power, especially at low engine speeds
• Increased fuel consumption: The vehicle consumes more fuel than usual
• Starting problems: Difficulty starting from cold or prolonged cranking
• Knocking noises: Metallic noises from the engine compartment, especially when accelerating
• Exhaust problems: Increased emission levels or black smoke from the exhaust

How to fix trouble code P0020?

• Repairing trouble code P0020 requires a systematic approach to identify the exact cause.
• Replace the VVT solenoid: Replace the faulty bank 2 camshaft position actuator solenoid after checking the electrical connections and resistance
• Change the engine oil and filter: Use the oil specified by the manufacturer with the correct viscosity and replace the oil filter, as incorrect or contaminated oil impairs the VVT function
• Repair wiring harness: Check and repair damaged cables or corroded connectors between the ECM and VVT solenoid, including continuity and resistance measurements
• Clean oil strainer: Remove and clean the VVT oil screen in the cylinder head, as blockages reduce oil pressure to the phaser
• Replace camshaft phaser: Mechanical damage to the phase adjuster requires a complete replacement of the unit, which often involves disassembly of the timing chain
• Check and replace oil pump: Test the oil pressure and replace the oil pump if there is insufficient pressure, as the VVT system requires sufficient oil pressure