P0020

What the Code Means

P0020 flags an open circuit or fault in the Bank 2 intake camshaft position actuator circuit (Intake “A” Camshaft Position Actuator Circuit/Open, Bank 2). Bank 2 is the engine side opposite cylinder No. 1.

The Bank 2 intake camshaft is out of sync with the oil control valve because of an open or faulty circuit. The VVT (Variable Valve Timing) system adjusts intake valve opening timing to optimize power and fuel economy: a solenoid controls oil flow to the phaser. With the circuit open, the DME can't control cam timing and sets the fault.

Symptoms

• Rough engine running
• Loss of power
• Increased fuel consumption
• Hard cold-weather starts
• Check Engine Light on
• VVT system not working correctly

Diagnosis and Repair

1. Check the Bank 2 VVT solenoid wiring for opens and shorts.
2. Measure solenoid resistance with a multimeter — spec is 7–12 ohms.
3. Check the solenoid connector for corrosion and oxidation.
4. Replace the VVT solenoid (oil control valve) if resistance is out of spec.
5. If the solenoid is good, replace the camshaft position sensor (CMP sensor).
6. Check engine oil level and condition: VVT runs on oil pressure.
7. Change the oil if it's contaminated — a common cause of VVT problems.
8. Clear the code and test-drive to confirm the repair.

Secondary Damage

• Camshafts go out of sync if the code is ignored.
• On interference engines, valves can contact pistons.
• Catastrophic engine damage as the fault progresses.