OBD-II code · Powertrain (manufacturer / generic)
P3457 Cylinder 7 Deactivation
The engine control module has detected a fault in the cylinder 7 deactivation system. Cylinder 7 cannot reliably switch between active and deactivated state.
Is it safe to drive with P3457?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyDeactivation solenoid failed
- PossibleLifter stuck
Repair at a glance
- Difficulty
- Hard
- 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
- Cylinder Deactivation Solenoid, Lifter, Engine Wiring Harness
Related codes
- P3465Cylinder 8 Deactivation
- P3473Cylinder 9 Deactivation
- P3481Cylinder 10 Deactivation
- P3489Cylinder 11 Deactivation
- P3496Cylinder 12 Deactivation
- P3454Cylinder 6 Exhaust Valve Control Circuit Low
- P3455Cylinder 7 Exhaust Valve Control Circuit Low
- P3456Cylinder 8 Deactivation/Intake Valve Control Circuit/Open
- P3458Cylinder 8 Deactivation/Intake Valve Control Circuit Low
- P3459Cylinder 8 Deactivation/Intake Valve Control Circuit High
- P3460Cylinder 8 Exhaust Valve Control Circuit/Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.