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U1255 Diagnostic Trouble Code Discussion for July 2009

Class 2 Communication Malfunction

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Trouble Ticket Help Requests for DTC U1255
Help Request Posted
2003 Buick LeSabre Limited 3.8L MIL Lamp on VIN: 1G4HR54K73
U1255: Class 2 Communication Malfunction. This car came in yesterday. Sometimes it runs great and then the door chimes go off and the mil light comes on with the traction contorl light as well. When these lights are on the HVAC control head blacks out and the A/C is inoperable. When I first checked fo...
July 29, 2009
1999 Cadillac Seville SLS 4.6L No Start VIN: 1G6KS54YXX
U1255: Communication error. ... after 2 seconds. I have no communication with pcm. I can communicate with all the other thirty modules but it seems I have a code U1255 loss of communication in all other mods. I have tested for power and ground at pcm and all is well there. I have also te...
July 30, 2009