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
Related codes
- P2650B Rocker Arm Actuator Control Circuit / Open Bank 1
- P2655A Rocker Arm Actuator Control Circuit / Open Bank 2
- P2660B Rocker Arm Actuator Control Circuit / Open Bank 2
- P2642Torque Management Feedback Signal B Range/Performance
- P2643Torque Management Feedback Signal B Low
- P2644Torque Management Feedback Signal B High
- P2646A Rocker Arm Actuator System Performance/Stuck Off Bank 1
- P2647A Rocker Arm Actuator System Stuck On Bank 1
- P2648A Rocker Arm Actuator Control Circuit Low Bank 1
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.