This code indicates that the PCM has detected a higher-than-expected voltage on the control circuit for cylinder 6's intake valve deactivation solenoid. This typically means the circuit is open or has a poor electrical connection, preventing the PCM from properly controlling that cylinder's valve deactivation system.
The solenoid itself may have an internal open circuit or failed coil winding, causing the PCM to see high voltage on the control line. This is the most common failure point for this code.
An open circuit, corroded pin, pushed-back terminal, or damaged wire between the PCM and the solenoid will cause high voltage to be reported. Connectors near the valve cover are exposed to heat and oil contamination and are a frequent source of problems.
Contaminated or low engine oil, or incorrect oil viscosity, can cause the deactivation solenoid to stick or operate improperly. While this may not directly cause a circuit-high code, it can contribute to solenoid failure over time.
A mechanically seized or collapsed deactivation lifter on cylinder 6 can cause related symptoms and may trigger this code alongside others, though the circuit code itself is electrical in nature.
A failed driver circuit inside the PCM is possible but uncommon. This should only be considered after the solenoid, wiring, and connectors have been definitively verified as good.
The vehicle is usually drivable, but cylinder deactivation will be disabled and you may notice rough running or reduced fuel economy. It should be addressed promptly to avoid potential damage to the deactivation system.
No. A circuit-high code almost always points to a failed solenoid or an open in the wiring/connector between the solenoid and the PCM. PCM replacement is rarely the correct fix and should only be considered after all other components are verified good through proper electrical testing.
No. This is an electrical circuit code for the valve deactivation system, not a misfire detection. However, a malfunctioning deactivation system can cause misfire-like symptoms and may trigger separate misfire codes.
Dirty or incorrect oil can contribute to solenoid failure over time and may cause related deactivation issues, but a circuit-high code specifically indicates an electrical problem in the control circuit, not an oil pressure fault.