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U1300 Diagnostic Trouble Code Discussion for February 2006

Class 2 Data Line Short To Ground


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Trouble Ticket Help Requests for DTC U1300
Help Request Posted
2002 Pontiac Montana 3.4L MIL Lamp on VIN: 1GMDU03E42
U1300: data link low in abs module list. With key on, all modules have no codes and data can be read, after starting, will not communicate data with aftermarket scanner (snap-on), and these codes all return. When abs module left out of circuit, all can be read but code u1040 comes back. Have checked ...
February 18, 2006