how to fix P0021 camshaft position timing over-retarded in Volvo XC60 First Generation (2008-2017)

Learn how to diagnose and fix P0021 camshaft position timing issue in Volvo XC60 (2008-2017). Step-by-step guide with diagnostic and repair instructions.

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock or short circuits.
• Allow the engine to cool before starting work.

2. Change Engine Oil and Filter

• Sub-steps:
  1. Remove the oil drain plug using a socket wrench and drain the oil into a suitable container.
  2. Replace the oil filter with a new one, ensuring the rubber O-ring is seated properly.
  3. Reinstall the oil drain plug and torque it to manufacturer specifications (usually 25-30 ft-lbs).
  4. Fill the engine with new oil that meets the manufacturer’s specifications (typically 5W-30 or similar).

3. Replace VVT Solenoid

• Tools Required: Socket set, Torque wrench, Oil filter wrench
• Sub-steps:
  1. Locate the VVT solenoid, usually positioned on the engine block near the camshaft.
  2. Disconnect the electrical connector and remove the bolts securing the solenoid.
  3. Replace with a new VVT solenoid and torque the bolts to manufacturer specifications (usually around 8-10 ft-lbs).
  4. Reconnect the electrical connector.

4. Inspect and Adjust Timing Chain/Timing Belt

• Sub-steps:
  1. Remove the timing cover after disconnecting necessary components (serpentine belt, engine mounts if needed).
  2. Align timing marks on the crankshaft and camshaft(s) to verify proper timing position.
  3. If misaligned, adjust the timing chain/belt as per service manual instructions.
  4. Reinstall the timing cover and ensure all bolts are torqued to specifications.

5. Reconnect Battery and Clear Codes

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