This code indicates the powertrain control module has detected that the "B" rocker arm actuator on engine bank 2 is not responding to commands or is mechanically stuck in the off position. The system relies on oil pressure to engage a locking mechanism that switches valve lift profiles, but the actuator solenoid or internal mechanical components have failed to move when commanded. This typically affects variable valve lift systems that use electro-hydraulic control to alter cam profiles.
The electro-hydraulic valve that directs pressurized oil to the rocker arm locking mechanism has failed electrically or is mechanically stuck closed, preventing the rocker arm from switching to the high-lift profile.
Engine sludge, debris, or incorrect viscosity oil restricts oil flow through the narrow passages feeding the rocker arm actuator, preventing sufficient pressure to move the internal locking pin.
The internal locking pin, return spring, or sliding mechanism within the rocker arm itself is physically seized due to wear, carbon buildup, or lack of lubrication, causing it to remain locked in the off position.
Open circuits, short-to-ground, or high-resistance connections in the wiring harness between the PCM and the solenoid prevent proper voltage and current from reaching the actuator coil.
Rarely, the output driver circuit inside the PCM that commands the solenoid may fail, though this is uncommon and should only be considered after verifying all mechanical components and wiring are functional.
No. Continued operation can cause abnormal wear to the valve train, potential misfires, and possible engine damage if the rocker arm fails to engage properly under load. The vehicle should be diagnosed and repaired promptly.
Almost never. While some repair facilities may recommend replacing the PCM, this code is virtually always caused by a faulty solenoid, oil pressure issue, or mechanical binding in the rocker arm. The PCM should be suspected only after all other components and wiring are verified good.
Bank 2 refers to the cylinder bank that does not contain cylinder number one. On V-configured engines, this is the side opposite to Bank 1.
If the code is caused by sludge or incorrect viscosity oil restricting flow, a proper oil change with manufacturer-specified viscosity may resolve it. However, if the solenoid has failed electrically or the rocker arm is physically seized, an oil change will not repair the underlying fault.