This diagnostic trouble code indicates the engine control module has detected voltage higher than expected in the intake valve control circuit for cylinder 12's deactivation system. This system disables specific cylinders during light load conditions to improve fuel efficiency. The fault prevents proper electrical control of the valve deactivation mechanism for that cylinder.
Internal electrical failure within the solenoid creates high resistance or an open circuit.
Wires may be chafed, broken, or shorted to a voltage source in the control circuit.
Corrosion or loose pins at the connector prevent proper signal transmission.
A disruption in the power supply to the control circuit triggers a high voltage reading.
Hydraulic systems rely on proper oil pressure, though this usually sets mechanical rather than electrical codes.
Internal driver failure is possible but statistically rare compared to external component faults.
Short-term driving is usually safe, but the engine may run rougher and consume more fuel.
No, PCM replacement is rarely the fix; focus on the solenoid and wiring first.
Low or dirty oil can affect deactivation systems, but electrical circuit codes usually point to wiring or solenoids.
The cylinder deactivation system will remain off, reducing fuel economy and potentially causing long-term wear.