Inspect and Repair Bank 2 VVT Solenoid Wiring Harness

If oil-related issues have been ruled out, the P0021 code may stem from an electrical communication failure between the Engine Control Module (ECM) and the Bank 2 intake oil control valve.

1. Locate the electrical connector for the Bank 2 intake oil control valve (VVT solenoid) at the top rear of the cylinder head.
2. Perform a visual inspection of the wiring harness for signs of heat damage, insulation fraying, or oxidation at the connector pins.
3. Use a digital multimeter to test for continuity between the solenoid connector and the corresponding pinout on the ECM to identify potential breaks in the circuit.
4. If damage is found, repair the wiring or replace the connector pigtail to restore the signal integrity required for precise camshaft timing adjustments.

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