Powertrain
generic / SAE
P2646
A Rocker Arm Actuator System Performance/Stuck Off Bank 1
The rocker arm actuator A on bank 1 is commanded to engage (high lift or all-cylinder mode) but does not switch. Engine stays in low-lift or deactivated mode under load, causing reduced power.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number6 / 46
Possible causes
- Low oil pressure cannot move the actuator high
- Mechanical lock pin stuck in unactivated position medium
- Carbon or debris buildup preventing free movement low
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 200–1800 €
- Estimated time: 1.5–5.5 h
- Component: rocker arm actuator a b1
- Component: oil control valve
- Component: oil supply
- MIL / check engine light
Sources
References
sae:J2012