OBD-II code · Powertrain (generic, extended)

P2661 B Rocker Arm Actuator System Performance/Stuck Off Bank 2

The rocker arm actuator B on bank 2 is commanded to engage but does not switch.

Is it safe to drive with P2661?

Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.

Common causes

  • Most likelyLow oil pressure cannot move the actuator
  • PossibleMechanical lock pin stuck in unactivated position
  • Less likelyCarbon or debris buildup preventing free movement

Repair at a glance

Difficulty
Hard
DIY friendly
Best left to a mechanic
Typical labour
1.5–5.5 h
Emissions test
Usually unaffected
Parts involved
Rocker Arm Actuator B B2, Oil Control Valve, Oil Supply

Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.