P3479
Cylinder Deactivation Solenoid Bank 1 Control Circuit Open
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.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Solenoid coil openCommon
- Wiring or connector openPossible
- ECM driver failedLess likely
Parts involved
- Cylinder Deactivation Solenoid
- Engine Wiring Harness
- ECM
P3479 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.