Powertrain
generic or reserved
P3403
Cylinder 1 Deactivation Stuck On
The engine control module has detected that cylinder 1 remains deactivated when activation is commanded — the deactivation hardware is stuck in the off state. Symptoms include rough running and reduced power.
SystemPowertrain
Typegeneric or reserved
GroupP3
Range / number4 / 03
Possible causes
- Lifter stuck collapsed high
- Solenoid stuck in deactivation position medium
- Carbon or debris buildup preventing free movement low
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 300–2000 €
- Estimated time: 2–10 h
- Component: cylinder deactivation solenoid
- Component: lifter
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012