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DTC U1300: Class 2 Short To Ground: Testing

  1. Turn ignition switch to OFF position. Connect scan tool. Turn ignition switch to RUN position. Using scan tool, attempt to establish communication with all modules. If scan tool communicates with all modules, go to next step. If scan tool does not communicate with one or more modules, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 SERIAL DATA LINE 
  2. Repair intermittent short to ground in class 2 serial data line (Purple wire). See DATA LINK CONNECTORS article in WIRING DIAGRAMS. After repairs, go to next step.
  3. Turn ignition switch to OFF position. Reinstall all components. Clear DTCs. Recheck for DTCs. If all DTCs are cleared, system is operating properly.
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