DTC U0300-4A: Internal Control Module Software Incompatibility - Incorrect Component Installed: Action
- Clear the DTC and retest
- If the DTC returns, using the manufacturer approved diagnostic system check and install latest relevant level of software to the rear differential control module
- Clear the DTC and retest
- If the DTC returns, check and install a new (GEN 4) rear differential control module kit as required. For additional information, refer to: Active On-Demand Coupling Module