OBD-II code · Powertrain (manufacturer / generic)
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.
Is it safe to drive with P3479?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelySolenoid coil open
- PossibleWiring or connector open
- Less likelyECM driver failed
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Cylinder Deactivation Solenoid, Engine Wiring Harness, Ecm
Related codes
- P3480Cylinder Deactivation Solenoid Bank 2 Control Circuit Open
- P3476Cylinder Deactivation Oil Pressure Switch Bank 1 Performance
- P3477Cylinder Deactivation Oil Pressure Switch Bank 2 Circuit
- P3478Cylinder Deactivation Oil Pressure Switch Bank 2 Performance
- P3481Cylinder 10 Deactivation
- P3482Cylinder Deactivation Solenoid Bank 1 Control Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.