The engine B2564 OBD 2 code on cars with automatically measured automatic transmissions, the 3-4 shift solenoid is accountable for activating the hydraulic circuits to trigger clutches or bands that change gears inside the automatic show. The dictionary meaning of the code is B for Body Code Problem is antilock brake system, electronic suspension and steering systems. 2 for MFG – Manufacturer Specific. 5 for Computer And Auxiliary Outputs. 6 for Control Module Throttle Actuator Position Performance and 4 for Cruise Vehicle Speed or Set Speed Difference Too High. The B2564 engine code appears a kind of body problem and it is easy to fix.