P0020 Fault Code

Long Description

Fault code P0020 is logged when the engine control unit (ECU) has detected a malfunction with the camshaft in bank 2.

It occurs when an open or short circuit has been detected in the camshaft actuator circuit.

The camshaft actuator is a component that falls under a variable valve timing (VVT) system. These are also referred to as oil control valves (OCVs).

The VVT system allows for the intake camshaft to slightly advance or retard in terms of timing to allow for various outcomes like increased fuel economy and performance.

A short or open circuit condition will prevent the actuator from allowing this change in timing. This can lead to improper timing between the crankshaft and intake camshaft.

This code can only occur in engines with two banks like a V-shape engine.

Mercedes-Benz, Ford, and Toyota are some of the most commonly searched manufacturers alongside this fault code.

Other Signs of This Problem

It is possible that there are several notable indicators that the camshaft is not being adjusted in accordance with the ECU. These can be relatively subtle or more noticeable depending on the severity of the issue.

The most obvious sign is the presence of the Check Engine light in your vehicle.

Other slightly less obvious signs are related to how the engine runs. It may run rougher than usual and will typically have a weak idle.

A knocking or pinging sound can also be heard from the engine in certain instances.

Along with these symptoms, it is likely that the vehicle will experience lower performance and decreased fuel economy as well.

There may be codes like P0021, P0022, and other similar shaft-related fault codes that could be logged. For the mirror code, see P0010.

What Could Be The Problem?

There are various issues that could cause fault code P0020 to be logged. These relate heavily to the oil system, as well as parts like the VVT control solenoid valve itself.

Because the ECU has detected an open or short circuit, there could be damage to the electrical components in the system. Damaged wires or loose connections can cause this.

A faulty VVT control solenoid valve is one of the most common causes of this issue. There can also be faults with the positioning sensors on the crankshaft and camshaft respectively.

The positioning sensors on both the camshaft and crankshaft could also be at fault. This may be indicated by fault codes like P0016.

Fixes

There are many systems that should be looked at to resolve the issue. Other fault codes can make this process easier.

One of the most straightforward ways to fix this is to address any damaged or frayed wires. Ensure all connections are secured properly as well.

A faulty or damaged VVT control solenoid must be replaced. Faulty or dirty positioning sensors should also be replaced if they cannot simply be cleaned.

Another simple fix is to replace dirty engine oil. An oil filter replacement can also help if the oil has contaminants.

Seriousness

Fault code P0020 can be considered moderate to severe in terms of seriousness. There is no immediate damage at risk to the various components in the engine, but it can accrue over prolonged use in this state.

It is best to get this issue resolved as soon as possible.