P3479
Cylinder Deactivation Solenoid Bank 1 Control Circuit Open
What it means
The engine control module has detected an open circuit at the bank 1 cylinder deactivation solenoid. The solenoid routes oil pressure to the switching lifters; an open circuit prevents activation and the system disables deactivation requests on bank 1.
Is it safe to drive?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Solenoid coil open
highOne of the most commonly reported causes for this code — check this first.
Wiring or connector open
mediumA plausible cause — test and verify before replacing parts.
ECM driver failed
lowLess common, but worth ruling out after the more likely causes.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P3479 freeNo credit card required