Removing the front kidney grille shutters on a BMW can trigger the CD9203 error code, indicating an issue with the Active Kidney Grille System (AKKS). While the motor continues to cycle, the car’s computer detects the missing shutters, leading to fault codes related to upper and lower stop limits. This guide outlines the coding process to address this issue, specifically focusing on variations related to the vehicle’s build date.
Understanding the AKKS and Error Codes
The AKKS manages airflow to the engine compartment for optimal cooling and aerodynamics. When the shutters are removed, the system can’t recognize the stop limits, triggering the CD9203 fault code and potentially related codes for upper and lower stop limit errors. Disabling the AKKS through coding is the solution to prevent these errors. However, the coding procedure differs based on the vehicle’s production date.
Coding the AKKS: Pre-July 2020 Builds
For BMWs manufactured before July 2020, the coding process involves modifying the “AKKS” parameter within the DME (Digital Motor Electronics) module using diagnostic software like E-Sys. The “AKKS” parameter should be set to 0x01, signifying that only the top shutters are present (even though they’ve been removed). Other values include:
0x00: No flaps present0x02: Top and bottom flaps present0x03: Default/uncoded (diagnostics remain active)
Coding the AKKS: Post-July 2020 Builds
BMWs produced after July 2020 utilize a different coding structure. Instead of a single “AKKS” parameter, there are two separate parameters:
- “LKS_OBEN” (AirFlapControl_Top): Controls the upper air flap.
- “LKS_UNTEN” (AirFlapControl_Bottom): Controls the lower air flap.
Both parameters should be set to 0x00 to disable the corresponding flap control and prevent error codes.
Troubleshooting Persistent Errors
Even after coding, some users report persistent lower stop limit errors (CD9203). A potential solution involves disconnecting the power connectors to both the upper and lower flap motors. This eliminates any signal feedback to the ECU, ensuring the system recognizes the deactivated state. If coding and disconnection fail to resolve the issue, further diagnosis may be necessary to identify other potential problems. Consult a qualified BMW technician for assistance.
Conclusion
Successfully resolving the CD9203 error after kidney grille shutter removal requires careful coding within the DME module. The specific coding procedure depends on the vehicle’s build date, with pre-July 2020 models using the “AKKS” parameter and post-July 2020 models utilizing “LKS_OBEN” and “LKS_UNTEN.” While coding usually resolves the issue, disconnecting the motor power connectors provides an alternative solution for persistent errors. Always ensure proper coding procedures are followed and consult a professional if necessary.
