How to Resolve the U112100 Fault Code?

[DallasRose]

U112100 fault code indicates a data bus loss, and a new battery needs to be replaced. Perform a power reset test; if the issue persists, reprogramming at a 4S shop is required. The solutions for the U112100 fault code are as follows: 1. First, remove the cover near the wiper and check whether the wiring harness of the engine and transmission is worn, whether the connectors of the engine control unit and transmission control unit are properly connected, and whether there is any water ingress in the connectors. 2. Ensure the wiring harness is intact and the control unit connectors are properly connected. Check that the brake control unit connectors are properly connected and the wiring harness is intact. Remove the trim panel on the left side of the dashboard and inspect the body wiring harness for any damage.