how to fix P0021 variable timing issue in Volvo XC60 536 (2017-Present)

Learn how to diagnose and fix P0021 variable timing issue in Volvo XC60. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, oil filter wrench, engine oil, timing tool set (if necessary).
• Allow the engine to cool down completely before starting any work.
• Disconnect the battery to prevent electrical shorts during repairs.

2. Oil Change (If Necessary)

• Sub-steps:
  1. Raise the vehicle using a jack and secure it with jack stands.
  2. Remove the oil drain plug using a socket wrench and let the old oil drain into a pan.
  3. Replace the oil filter using an oil filter wrench.
  4. Reinstall the oil drain plug and tighten it to the manufacturer's torque specification.
  5. Fill the engine with new oil as per the manufacturer’s specifications.

3. VVT Solenoid Replacement

• Sub-steps:
  1. Locate the VVT solenoid (usually near the camshaft on the engine).
  2. Disconnect the electrical connector from the VVT solenoid.
  3. Remove the mounting bolts securing the solenoid and take it out.
  4. Install the new VVT solenoid and tighten the mounting bolts to the specified torque.
  5. Reconnect the electrical connector to the solenoid.

4. Timing Chain/Belt Inspection/Replacement (If Necessary)

• Sub-steps:
  1. Remove any necessary components to access the timing chain/belt (e.g., covers, accessories).
  2. Use a timing tool set to check the alignment of the timing marks on the camshaft and crankshaft.
  3. If misaligned, remove the old timing chain/belt and replace it with a new one, ensuring proper alignment.
  4. Reinstall all removed components and ensure they are tightened to the specified torque.

5. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use an OBD-II scanner to clear the P0021 code from the ECU.