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2005 - 2012 Subaru trouble code P0026 Intake Valve Control Solenoid Circuit range Bank 1.

What Does the P0026 Code Mean? Diagnostic trouble code (DTC) P0026 stands for “Intake Valve Control Solenoid Circuit Range/ Performance (Bank 1). It is set when the powertrain control module (PCM) detects that the actual camshaft position does not match the desired camshaft position. This problem may be due to an issue with the operation of the VVT solenoid. Code P0026 may be triggered in vehicles equipped with a VVT and/or VVL system.

There’s a two-wire solenoid the ECM/PCM uses to control the oil pressure delivered to the cam timing device on each head if the vehicle is a V6 or even if it’s a four cylinder with 2 camshafts. It’s easy for the ECM/PCM to keep track of this circuit.

A “performance” code can mean that there is no problem with the circuit, but that the ECM/PCM sent a command and determined that the command either didn’t happen or didn’t happen quickly enough, which would be a mechanical issue or possibly sludge-clogging of the solenoid or passages.

Code P0026 may also be set in vehicles with VVL systems when the PCM perceives that the VVL oil pressure switch has been either “on” or “off” for too long.

Bank 1 refers to the side of the engine where cylinder #1 is located. In most vehicles, the intake valve control solenoid is usually found on the intake manifold side of the cylinder head. To understand this code better, let’s discuss how VVT and VVL systems work.

If you’re interested in a DIY fix for P0026, you should read our advanced technical discussion about camshaft angle and VVT.

Variable Valve Timing Systems
A VVT system adjusts the timing of the opening and closing of the intake and/or exhaust valves to improve fuel consumption and/or engine performance. It uses actuator(s) that are usually mounted on the end of the camshaft(s).

The vehicle’s primary computer sends a signal to the VVT solenoid (s) to apply pressure to the actuator(s) to change the position or angle of their corresponding camshaft. This process alters the valve timing as required.

Variable Valve Lift Systems
A VVL system allows the PCM to vary the distance that the valves can be lifted from their seats to enhance engine performance. It uses a camshaft with different profiles for low-speed and high-speed operation.

A typical VVL system has three rocker arms operating two intake valves. When conditions are correct, the PCM commands an oil control solenoid to apply oil pressure to drive a pin that locks the rockers together. This forces the valves to follow the cam profile designed for high-speed operation. The VVL diagnosis switch lets the PCM know when oil pressure has been applied to the system.

Note: The definition of code P0026 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Possible Causes of the P0026 Code?
Engine oil level too low
VVL diagnostic switch failure
VVL solenoid failure
VVT solenoid failure
VVT actuator failure
PCM failure or software in need of an update
Engine oil does not meet manufacturer requirements
Wiring issue
What are the Common Symptoms of the P0026 Code?
Check engine light is on
Poor acceleration
Decreased engine performance
Decreased fuel economy
How to Diagnose the P0026 Code
Diagnosing the underlying cause of the P0026 code can be tricky. Without the proper tools and know-how, it may be difficult to pinpoint which component is causing the problem. If you are not well-versed in auto repair, it is best to take your car to an auto shop for proper diagnosis.

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