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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.

  • Check engine light: Yes
  • Emissions related: No
  • Repair difficulty: hard

Common causes

Ordered by how often each turns out to be the cause.

  • Mechanical lock pin stuck in activated positionCommon
  • Oil control valve spool stuck openPossible
  • Carbon or debris buildup preventing free movementLess likely

Parts involved

  • Rocker Arm Actuator B B1
  • Oil Control Valve

P2652 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.