Installing a non-OEM standard alternator that lacks the specific BMW-proprietary communication chip protocol. Step-by-Step Diagnostic & Troubleshooting Procedure

The DSC module sends torque reduction requests to the DME during cornering, braking, or wheel slip. If the DSC yaw rate sensor, steering angle sensor, or brake pressure sensor gives erratic data (e.g., due to a failing DSC pump or hydraulic unit), the DME triggers D52C44 as a fail-safe.