DTC U1301: Class 2 Short To Battery: Testing
WARNING: This page is about a different car, the 1998 Cadillac Eldorado and 1998 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
DTC U1301 should always be a history DTC. If DTC U1301 is current, modules on class 2 serial data line cannot communicate with each other or diagnostic equipment. Check for intermittent short to battery in Purple wire between individual control modules. Refer to WIRING DIAGRAMS .