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U1255 Diagnostic Trouble Code Discussion for November 2009

Class 2 Communication Malfunction


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Trouble Ticket Help Requests for DTC U1255
Help Request Posted
1999 Buick Century Custom 3.1L No Start VIN: 2G4WS52M9X
U1255: generic class II communication fault. Hey GM techs! shop key tells me pcm sends initial serial data with key on to bcm and aldl. Without this bcm sets a security light and locks me out from a start situation. I can manually start the car by creating a ground on pin 86 at the starter relay. Bcms ra...
November 04, 2009
1999 Buick Century Custom 3.1L No Start VIN: 2G4WS52M9X
U1255: generic class II communication fault. Hey GM techs! shop key tells me pcm sends initial serial data with key on to bcm and aldl. Without this bcm sets a security light and locks me out from a start situation. I can manually start the car by creating a ground on pin 86 at the starter relay. Bcms ra...
November 04, 2009