OBD-II code · Powertrain (manufacturer / generic)
P3466 Cylinder Deactivation Hydraulic Circuit Bank 1 Open
The engine control module has detected an open hydraulic circuit in the cylinder deactivation system on bank 1. The system uses pressurized engine oil routed through dedicated lifters and oil control valves to collapse valves; an open circuit indicates loss of oil flow or a failed pressure switch.
Is it safe to drive with P3466?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOil pressure switch failed
- PossibleOil passage blocked or sludge buildup
- PossibleOil control valve stuck
Repair at a glance
- Difficulty
- Shop_only
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–10 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Oil Control Valve, Oil Pressure Switch, Lifter, Engine Oil Passage
Related codes
- P3470Cylinder Deactivation Hydraulic Circuit Bank 2 Open
- P3463Cylinder 8 Exhaust Valve Control Circuit High
- P3464Cylinder 8 Exhaust Valve Control Circuit High
- P3465Cylinder 8 Deactivation
- P3467Cylinder Deactivation Hydraulic Circuit Bank 1 Performance
- P3468Cylinder Deactivation Hydraulic Circuit Bank 1 Low
- P3469Cylinder Deactivation Hydraulic Circuit Bank 1 High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.