OBD-II code · Powertrain (generic, extended)

P2652 B Rocker Arm Actuator System Stuck On Bank 1

The rocker arm actuator B on bank 1 stays in the activated state when commanded off. Engine cannot return to the alternate lift or cylinder mode.

Is it safe to drive with P2652?

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

Common causes

  • Most likelyMechanical lock pin stuck in activated position
  • PossibleOil control valve spool stuck open
  • 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 B1, Oil Control Valve

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