This code indicates an electrical fault within the control circuit for the cylinder 1 exhaust valve deactivation solenoid. The engine control module detects voltage levels lower than expected, preventing the system from disabling the exhaust valves during light load conditions. This issue is common in engines equipped with variable cylinder management technology.
The solenoid coil often develops internal shorts or opens, causing low voltage readings.
Wires near the valve cover may chafe or melt, creating a short to ground.
Oil contamination or moisture can increase resistance in the solenoid plug.
Insufficient oil pressure can prevent proper solenoid function and trigger circuit codes.
A failure in the power supply circuit will result in low voltage detection.
Internal PCM driver failure is possible but statistically rare compared to external components.
No, PCM failure is uncommon; the solenoid or wiring is the likely cause.
Yes, but the engine may run less efficiently and consume more fuel.
No, the underlying electrical fault must be repaired to prevent return.
Yes, sludge can hinder solenoid movement, but electrical faults are more common.