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U1255 Diagnostic Trouble Code Discussion for November 2006

Class 2 Communication Malfunction

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Trouble Ticket Help Requests for DTC U1255
Help Request Posted
2000 GMC C3500 Sierra SL 6.5L No Start VIN: 1GDKC34FXY
U1255: Class 2 Communication Malfunction. ... run again. The Tech II will not comunicate with engine, transmission or body control module, but you can read data on the Passlock. This U1255 is current and in history. Class DTC check modules VID\EVO DTC's yes. Class 2 message monitor module ABS\ICS VID...
November 28, 2006