how to resolve the P0021 code in my Volkswagen Golf MK7.5 (2020-Present)

Learn how to diagnose and fix P0021 camshaft timing issue in Volkswagen Golf MK7.5. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect Engine Oil

• Sub-step 1: Remove the oil filler cap and check oil level with a dipstick.
• Sub-step 2: If oil is low, top it up with the manufacturer-recommended oil (e.g., VW 502 00).
• Sub-step 3: If oil is dirty or contaminated, perform an oil change.

3. Replace VVT Solenoid

• Sub-step 1: Locate the VVT solenoid, typically found near the camshaft cover.
• Sub-step 2: Disconnect the electrical connector from the solenoid.
• Sub-step 3: Remove the mounting bolts securing the solenoid.
• Sub-step 4: Replace the solenoid with a new one and torque the bolts to the manufacturer specifications (check service manual for specific torque values).
• Sub-step 5: Reconnect the electrical connector.

4. Verify Timing Chain/Belt

• Sub-step 1: Remove any covers obstructing access to the timing chain/belt.
• Sub-step 2: Use a timing tool to verify that the camshaft and crankshaft timing marks align correctly.
• Sub-step 3: If misaligned, adjust the timing according to the service manual instructions.

5. Reconnect Battery and Clear Codes

• Sub-step 1: Reconnect the negative battery terminal.
• Sub-step 2: Use an OBD-II scanner to clear the P0021 code from the system.