This code indicates the engine computer has detected a low-voltage condition on the control circuit for the intake valve deactivation solenoid on cylinder 1. It means the electrical signal to that solenoid is not reaching the expected level, which can prevent the cylinder from properly deactivating or reactivating. This is a circuit-level fault rather than a performance fault.
The solenoid itself is the most common failure point. Internal electrical faults, contamination from dirty oil, or mechanical binding can cause the solenoid to draw incorrectly or not respond, triggering the low-circuit code.
Corroded, bent, or pushed-back connector pins, chafed wiring, or a short to ground on the control circuit can pull voltage below the expected threshold and set this code.
Sludge or incorrect oil can cause the deactivation solenoid to stick or operate erratically, which may contribute to circuit faults if the solenoid cannot complete its commanded function.
A mechanically seized or collapsed deactivation lifter can create excessive current draw or prevent the solenoid from functioning, which may be interpreted by the PCM as a circuit fault.
A failure of the driver circuit inside the PCM is possible but very rare. This should only be considered after all wiring, solenoid, and mechanical checks are exhausted.
Short-distance driving is usually possible, but continued operation can cause rough running, increased fuel consumption, and potential valve train damage. It is best to diagnose and repair promptly.
No. This code is almost never caused by the PCM. The solenoid, wiring, or connector are the likely culprits. PCM replacement should only be considered after all other causes have been conclusively ruled out through proper electrical testing.
It can be. Dirty oil, wrong viscosity, or low oil level can cause deactivation solenoids to stick or fail. An oil change with the correct specification may resolve a sticking solenoid if the component is not permanently damaged.
The code may clear after a repair and a complete drive cycle, but it is best to clear it with a scan tool and then verify it does not return under the conditions that originally set it.