OBD-II code · Powertrain (manufacturer / generic)
P3474 Cylinder Deactivation Hydraulic Circuit Bank 2 High
The engine control module has detected an excessively high oil pressure or stuck-on signal in the bank 2 hydraulic circuit for cylinder deactivation. A stuck oil control valve, a blocked relief path or a shorted pressure switch is reporting permanently high pressure on bank 2.
Is it safe to drive with P3474?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyOil control valve stuck open
- PossiblePressure switch shorted
- Less likelyBlocked relief passage
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1.5–7 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
Related codes
- P3469Cylinder Deactivation Hydraulic Circuit Bank 1 High
- P3471Cylinder Deactivation Hydraulic Circuit Bank 2 Performance
- P3472Cylinder Deactivation Hydraulic Circuit Bank 2 Low
- P3473Cylinder 9 Deactivation
- P3475Cylinder Deactivation Oil Pressure Switch Bank 1 Circuit
- P3476Cylinder Deactivation Oil Pressure Switch Bank 1 Performance
- P3477Cylinder Deactivation Oil Pressure Switch Bank 2 Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.