Each has its own diagnostic procedures, and the best source for understanding how these systems work will always be your information system. GM has used many different four-wheel-drive control systems in its vehicles over the years, ranging from pure mechanical to electronically controlled. Before we look at the other truck, it might be useful to see what GM’s ESI website (information says about B2725, to get a better understanding of the system’s design characteristics. 02-04-21-004 indicates a known problem with this switch assembly. Systems include: Fuel Injector, Glow Plug, Brake System, Chassis, Liftgate and Distance Sensing Cruise Control New vehicle identification screen.Īfter all, General Motors TSB No.
What kind of diagnostic software does a GMC have?īuick, Cadillac, Chevrolet and GMC systems update with codes, data, tests and special functions for most 2015 and newer vehicles. ATC is the GM acronym for active transfer case.
To get to the proper screens, you must choose the Powertrain selection, then navigate your way to the ATC selections. The transfer case module data can be accessed with a scan tool such as the Tech 2, which is GM’s official scan tool. What does ATC stand for in GM transfer case? Both trucks had one DTC stored: B2725 (active transfer case mode switch malfunction). Selecting “F1” on the menu got us where we needed to be. These two trucks have 19 possible DTCs, including those for input, motor, encoder and even VIN codes. On the 2000 GM truck, the complaint was no four-wheel drive, and the 4WD light in the IPC (instrument panel cluster) came on at times. Since both trucks have mode switch trouble codes, it seems logical to start there.
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