The Engine Control Module (ECM) has detected an open circuit in the control circuit for the Bank 1 rocker arm actuator. This indicates a lack of electrical continuity, preventing the actuator from adjusting valve lift or timing as commanded.
The internal coil of the actuator solenoid has failed or broken, creating an open circuit.
Wires leading to the actuator have been frayed, cut, or broken due to heat, abrasion, or rodent damage.
Oxidation or a loose pin at the electrical connector has interrupted the electrical path.
A fuse providing power to the actuator circuit has blown, breaking the circuit.
An internal failure within the ECM's driver circuit for the actuator, though this is uncommon.
The vehicle is generally drivable, but it may enter a 'limp mode' with reduced power and efficiency to protect the engine.
No. In the vast majority of cases, the issue is a failed solenoid or damaged wiring. The ECM is rarely the cause and should only be considered after the actuator and wiring have been thoroughly tested.
Since P2645 is an electrical 'open circuit' code, cleaning the mechanical parts will not fix the issue; the electrical continuity must be restored.