This code indicates that the engine computer has detected a performance problem in the electrical circuit that controls the intake valve deactivation system for cylinder 1. This system shuts down specific cylinders to improve fuel economy during light-load driving, and the code sets when the valve fails to activate or deactivate as commanded.
The solenoid that controls oil pressure to the intake valve actuator can fail internally, preventing proper valve deactivation.
The deactivation system relies on hydraulic pressure; low oil, wrong viscosity, or degraded oil can prevent the system from functioning correctly.
Corroded, open, or shorted wires and poor pin connections in the deactivation solenoid circuit will cause a performance fault.
A collapsed deactivation lifter, stuck valve, or internal oil passage blockage can physically prevent the intake valve from responding to commands.
The engine computer rarely fails, but an internal driver circuit malfunction can prevent it from properly operating the solenoid.
It is generally safe to drive for short distances, but the engine will run rough and lack power. Extended driving with a misfire can damage the catalytic converter, so it should be repaired promptly.
No, replacing the PCM is rarely the correct fix for this code. Drivers are frequently told to replace the computer, but the root cause is almost always a failed solenoid, wiring issue, or an oil pressure problem.
Yes, if the engine oil is old, heavily degraded, or the wrong viscosity, it can cause hydraulic pressure issues that trigger the code. Changing the oil and filter can sometimes resolve the problem if caught early.
Cylinder deactivation is a fuel-saving feature that shuts down specific cylinders by keeping their intake and exhaust valves closed while driving under light loads, effectively turning a V8 into a V4 temporarily.