P0020 — “A Camshaft Position Actuator Circuit (Bank 2)

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🔧 Code Meaning

P0020:

> “A” Camshaft Position Actuator Circuit (Bank 2)

“A” = Intake camshaft (usually the front or upper cam on DOHC engines).

Bank 2 = The cylinder bank without cylinder #1.

The ECM (Engine Control Module) detected an electrical fault in the VVT (Variable Valve Timing) actuator solenoid circuit on that side.

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⚙️ Common Causes

Type Possible Issue

Electrical – Open/short in VVT solenoid wiring (Bank 2 Intake) <br> – Corroded or loose connector <br> – Blown fuse related to VVT or ECM <br> – Faulty VVT solenoid (Oil Control Valve)

Mechanical – Dirty or sludge-filled oil passages to VVT solenoid <br> – Incorrect oil type or low oil pressure <br> – Timing chain stretch or misalignment (less common)

ECM Related -Rarely, a faulty ECM driver circuit for VVT solenoid

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🔍 Step-by-Step Diagnosis

1. Visual Inspection

Check Bank 2 intake camshaft actuator solenoid — look for oil leaks, damaged connector, or burnt wiring.

Inspect harness near the valve cover (they often rub and short to ground).

2. Electrical Test

Unplug the VVT solenoid (Bank 2 intake).

Check resistance across the solenoid terminals:

Typical value: 6–12 ohms (varies by make).

Infinite = open circuit → replace solenoid.

< 1 ohm = shorted coil → replace solenoid.

Check for 12V supply on one wire (key ON, engine OFF).

Check for ECM ground control signal on the other wire with a test light or scope (during command test).

3. Actuator Function Test

If your scan tool supports VVT solenoid activation, command Bank 2 intake actuator ON/OFF.

You should feel or hear a click.

No click = bad solenoid or no power/ground.

4. Oil System Check

Verify correct engine oil level and viscosity.

Replace oil + filter if dirty.

Clean oil control valve screen (if fitted).

5. Advanced

If wiring and solenoid test OK but P0020 persists → suspect ECM driver fault (rare).

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🔩 Common Fixes

Replace Bank 2 intake VVT solenoid.

Repair or replace damaged wiring or connector.

Perform oil change with manufacturer-specified oil.

Clear codes and recheck after road test.

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