OBD-II code · Powertrain (generic, extended)

P2645 A Rocker Arm Actuator Control Circuit / Open Bank 1

The controller cannot drive the rocker arm switching actuator A on bank 1 (used in cylinder deactivation systems such as VTEC, AFM, MDS). The valve lift mode cannot be switched.

Is it safe to drive with P2645?

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

Common causes

  • Most likelyOpen coil in oil control valve
  • PossibleBroken control wire

Repair at a glance

Difficulty
Hard
DIY friendly
Best left to a mechanic
Typical labour
1.5–5 h
Emissions test
Usually unaffected
Parts involved
Rocker Arm Actuator A B1, Oil Control Valve, Wiring Harness

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