Fixing the Fault Code P0020: Camshaft Position A Actuator Circuit Bank 2

Last Updated on November 9, 2026

What does the P0020 code mean?

The P0020 code identifies a fault in the control circuit for the Bank 2 “A” camshaft position actuator. On a typical engine with separate intake and exhaust camshafts, “A” is the intake camshaft. Bank 2 is the cylinder bank that does not contain cylinder number one. Confirm the layout and connector location for the exact engine before testing.

In a hydraulic variable valve timing (VVT) system, the engine computer commands an oil control valve, also called an actuator solenoid. The valve directs pressurized engine oil to a phaser, which changes when the intake valves open and close. The position sensor reports the angle back to the computer. The P0020 code comes from the actuator circuit monitor. The Bank 1 intake actuator circuit code is the counterpart for the other bank.

An open coil, a damaged wire or a short can set the code on systems that monitor those conditions. The exact detection logic varies by vehicle. For example, Toyota’s 1GR-FE procedure lists the oil control valve, its wiring and the engine computer as the electrical areas to test. Use the specifications and pin diagram that match your engine.

What causes the P0020 code?

Start by looking at the valve and the wiring that operates it. A failure can be inside the solenoid or anywhere along the path between it and the computer.

• A failed coil or internal connection. A break inside the actuator can interrupt current. A heat-sensitive connection can work on a cold engine and open when it warms up.
• A loose or contaminated plug. Look for a broken lock, backed-out terminals, oil inside the connector, corrosion or signs of an incomplete connection after recent work.
• Harness or circuit supply trouble. Wiring can rub through on a bracket, be pinched during a repair, or break inside intact insulation. Check the relevant feed, fuse, control wire and grounds where the diagram shows them.
• A control-module output fault. Follow the maker’s procedure after the valve and the wiring test correctly. Review matching service information before considering a calibration update or module replacement.

Old oil, a restricted filter, low oil pressure and a worn timing drive can affect cam timing. Those findings help when a timing performance code also appears or the cam fails to follow a valid command. In the presence of a confirmed circuit fault, repair the electrical problem and retest before deciding whether there is a second fault.

What are the Possible symptoms of the P0020 code?

A steady check engine light may be the first sign, even when the car feels normal. If the computer restricts variable valve timing, you may notice a rough idle, hesitation, reduced power or higher fuel use. The effects depend on the engine and how it responds to the fault.

Note when the warning appears. A light that comes on just after the valve connector was unplugged points you toward a different first check from a light that returns only after a hot restart. A loud rattle, repeated stalling or visible exhaust smoke also deserves a separate assessment. Those symptoms can involve an oil, timing or combustion fault that needs attention in its own right.

How does a Professional diagnose the P0020 code?

Start with a complete scan using an OBD-II scanning tool. Record stored and pending faults, freeze-frame details when available and the driving conditions that brought on the light. Keep that information until you have finished the tests.

1. Confirm the part and the bank. Use the service diagram to identify the Bank 2 intake oil control valve. Compare the connector and harness route with the drawing. A nearby cam position sensor reports feedback and has its own test procedure.
2. Inspect the connector and harness. With the ignition off and the engine cool enough to work around, look for damaged terminals, oil, corrosion, chafing and wiring disturbed during other work. Check if the plug locks in place. Use a suitable test adapter to avoid spreading the terminals.
3. Test the valve and its circuit. Compare resistance with the engine-specific limits, with the circuit de-energized and the components disconnected as directed. Test the supply and control path under the specified conditions. A high-resistance connection can pass an unloaded continuity check, so the maker may specify a load or voltage-drop test.
4. Check the commanded response where supported. A compatible bidirectional scanner may allow a technician to command the valve and compare its response with cam angle. If the control circuit works but the angle barely changes, follow the oil-flow and timing tests. If the scan also shows a Bank 2 intake camshaft correlation fault, follow the service order for the position signals and mechanical timing.

Check oil level, grade and service history during the inspection. A correct oil level helps the phaser operate, while the circuit tests tell you whether the valve can receive the command. If both banks show actuator circuit faults, the wiring diagram can help you see whether they share a power source or connector.

Avoid Common mistakes when diagnosing the P0020 code

• Identify the connector from the engine diagram before ordering a solenoid. Intake and exhaust valves can look alike.
• Keep the scan information and test under the conditions that caused the fault. An intermittent problem may be absent in a cold workshop.
• Use the exact circuit procedure. A pulse-width-modulated control can give a changing or averaged meter reading, and a generic resistance number can lead you to the wrong part.
• Verify the harness, valve and module inputs before authorizing software or hardware replacement.

How serious is the P0020 code?

Treat this OBD error code as a reason to arrange diagnosis promptly. If the light is steady and the engine runs normally, avoid heavy loads while arranging the check. If the light flashes with shaking, the engine stalls repeatedly, or a loud new timing rattle appears, pull over safely and arrange recovery. Shut the engine off safely if an oil-pressure warning appears.

How to Fix the DTC P0020 Error Code?

Repair the fault the tests confirm. Replace a damaged connector or repair a wire with the specified terminals, seals and routing. Replace the Bank 2 intake solenoid if its coil or internal connection fails the prescribed test. Match the part and seal to the exact engine, then check for leaks after assembly.

If the code returns with a working circuit, review the other scan results before going deeper. A restricted oil feed, a sticking phaser or incorrect base timing calls for its own test. Timing components and position sensors should be replaced when the diagnosis identifies a fault in those parts. Consider the ECM only after its power, grounds, control output and other circuit checks support that step.

Repeat the original circuit test after the repair. Clear the code at the stage specified in the manual and run any required verification or relearn. Check pending codes as well as the warning light. A light that goes out immediately after clearing can come back when the relevant monitor runs again.

Repair Cost

Ask for an itemized estimate after the failed test is known. These are separate jobs. A shop can quote the work that the diagnosis supports.

• Timing chain or belt. Access, related guides or seals, fluids and labor vary by engine. Ask which alignment finding supports timing work.
• Camshaft actuator solenoid. Match the Bank 2 intake valve, connector and seal to the engine. Location and access affect labor.
• Chain or belt tensioner. Ask whether it is included in an existing timing-drive estimate or is being quoted separately after inspection.
• Cam or crank reference wheel. The manufacturer’s repair procedure and the amount of disassembly determine what parts and labor are needed.
• Camshaft or crankshaft position sensor. Ask which signal or circuit check identified the failed sensor and what access is required.
• Wiring and connectors. The quote depends on the length and location of the damaged wiring and whether an individual terminal, connector or harness section is needed.

Have diagnosis, parts, labor and verification listed separately. Ask for the test result that supports any work beyond the intake actuator circuit.

Bottom Line

When the P0020 code appears, confirm Bank 2 and start with the intake actuator’s connector, valve and control wiring. Bring the shop your scan results and mention any recent engine work. A confirmed failed test gives you a clear repair and something to check again afterward.