OBD-II Code P0020 — What It Means & How to Fix It

What Does This Error Mean?

P0020 means there is an electrical problem with the intake camshaft actuator circuit on Bank 2. The actuator is a solenoid valve that adjusts camshaft timing for better performance and fuel economy. Your car's computer detected that the circuit is not operating within normal range. This is usually caused by a faulty solenoid, wiring damage, or dirty engine oil. You may notice rough idle, sluggish acceleration, or reduced fuel economy.

Affected Models

All vehicles 1996+
Common in Chevrolet Traverse
Common in Ford F-150
Common in Nissan Altima
Common in Toyota Camry V6

Common Causes

Faulty intake camshaft oil control solenoid (OCV) on Bank 2
Wiring harness damage — cut, shorted, or corroded wires to the solenoid
Dirty or sludged engine oil blocking the solenoid valve from operating
Failed solenoid connector with corrosion preventing proper electrical contact
Rarely, a faulty ECM (engine computer) sending incorrect signals

How to Fix It

Start with an oil check. Pull the dipstick and examine the oil level and condition. Dark, thick, or sludgy oil is a very common cause of VVT solenoid codes. Change the oil and filter if overdue.

Use the exact oil viscosity from your owner's manual. The VVT solenoid has a tiny screen inside that clogs with dirty oil particles.
Locate the Bank 2 intake camshaft oil control solenoid. It is usually mounted on the front or side of the valve cover on the Bank 2 cylinder head. Unplug the electrical connector and inspect for corrosion or bent pins.

Bank 2 is the side of the engine without cylinder number 1 — often the passenger side on V-engines.
Use a multimeter to measure the solenoid's resistance between its two terminals. Most VVT solenoids read between 6 and 12 ohms. A reading of zero or infinity means the solenoid has failed.

You can look up the exact spec for your vehicle in the factory service manual or a free database like AllDataDIY.
Inspect the wiring harness from the solenoid back to the ECM. Look for spots where the insulation is cracked, melted, or rubbing against metal. Repair any damaged wiring with proper heat-shrink connectors.

Wiring faults are easy to overlook. Wiggling wires while watching a live scan tool reading can reveal intermittent breaks.
Replace the solenoid if it tested bad or the code returns after fresh oil. Clear the code and drive through two full warm-up cycles to confirm the repair.

The solenoid itself usually costs $30-$80 at an auto parts store and is typically easy to swap — just one or two bolts.

When to Call a Professional

P0020 is usually an electrical or oil-related issue — often DIY-friendly. If basic checks don't clear it, a mechanic with a wiring diagram can trace the circuit. Diagnosis runs $75-$150 at a shop. Solenoid replacement is $100-$300 parts and labor depending on the vehicle. Don't ignore it — VVT system faults can reduce fuel economy and engine performance significantly.

Frequently Asked Questions

What is a camshaft actuator solenoid?

It is a small electrically controlled valve, sometimes called an OCV (Oil Control Valve). It directs pressurized engine oil to the VVT (Variable Valve Timing) actuator on the camshaft. By adjusting timing, the engine gets better power at high RPM and better fuel economy at low RPM. When the solenoid fails, the engine loses that adjustment ability.

Will P0020 fail an emissions test?

Yes, it likely will. P0020 turns on the check engine light. Most states fail a vehicle for any active check engine light during an emissions inspection. Fix the code before your test to avoid a failed inspection.

Can I fix P0020 myself?

Often yes, if you are comfortable with basic tools. Checking oil, inspecting connectors, and replacing a solenoid are DIY-friendly tasks. You will need a multimeter to test the solenoid. If wiring is damaged or the code persists after solenoid replacement, a mechanic is the best next step.