BMW M235i xDrive error code for Valvtronic actuator after 4G hardware upgrade, actuator replaced and car running well on BMW M235i xDrive

Some BMW M235i xDrive owners report experiencing error codes related to the Valvetronic actuator after upgrading to 4G hardware, specifically the code "135808 - Valvetronic servomotor position sensors, electrical, open circuit, short circuit: Malfunction." This issue often necessitates checking and potentially replacing the servomotor and/or wiring harness. Additionally, some owners found that replacing the ground strap with the OE part from BMW helped restore normal voltage levels, although Valvetronic codes may still remain active and disabled. In similar cases, after replacing the Valvetronic actuator due to a short circuit, the engine initially ran rough, leading to further replacements of the Eccentric Shaft and its harness. Another common error encountered is "2DCF: valvetronic system no movement identified," which may occur if the car experiences a battery issue. Prompt and accurate resolution of these issues, such as replacing the Valvetronic actuator, is crucial for ensuring the proper functioning of the vehicle after hardware upgrades.