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.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Open coil in oil control valveCommon
- Broken control wirePossible
Parts involved
- Rocker Arm Actuator A B1
- Oil Control Valve
- Wiring Harness
P2645 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.