A Rocker Arm Actuator Control Circuit/Open Bank 1
What it means
P2645 means the PCM detected an open (broken) electrical circuit to the 'A' rocker arm actuator on bank 1. This actuator is an oil-controlled solenoid that switches the engine's variable valve lift. With the circuit open the actuator can't operate, so the engine loses that mode and may run rough or down on power. It's an electrical/oil-control fault, not a no-start condition, and is usually caused by wiring or a failed solenoid.
Can I keep driving? Usually driveable — you may lose the variable-lift mode with reduced power or rough running, but fix it soon to protect drivability and fuel economy.
Common symptoms
What you'll notice
- Check-engine light on
- Reduced power or performance
- Rough running or a misfire-like feel
- Valvetrain tick or noise
- Reduced fuel economy
Common causes
Most likely first
- Open circuit — broken wiring or a poor connection to the actuator solenoidLikely
- Faulty rocker arm actuator (oil control) solenoid on bank 1Common
- Low or dirty engine oil affecting the actuatorCommon
- Corroded or loose connector, or a bad groundLess often
- Faulty PCMLess often
How to diagnose & fix
Work through it in order
- Scan and confirm the code, then inspect the bank 1 actuator wiring and connector for an open.
- Check the engine oil level and condition — these actuators are oil-operated.
- Measure the solenoid's resistance and its supply/ground circuits.
- Replace the actuator solenoid if it fails testing.
- Repair wiring as needed, then clear the code and re-test.
FAQ
Quick answers
Is it safe to drive with P2645?+
Can I just clear P2645?+
Related codes
Often seen with P2645
Read & clear P2645 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.