had the truck pluged into computer and is not reading any codes or 4wd at all what could be the problem checked grounds and im at a loss now of what to do
GMC Q&AAsk Your Question
2000 GMC Sierra 1500 Question: my service 4wd light came on replaced the push button switch and now nothing
Answer #1G. T. Service Center (4142 Answers) , Stephenville, TX - (254) 638-3236ProfessorG November 01, 2013, 05:48Master
Need a different scan tool, generic tools only scan emission codes. Need a more professional scan tool to read the separate modules, like the 4wd module. Just a quick idea had one that the cigarette lighter fuse in the under hood fuse box was blown, of course it didn't power the DLC connector. I use a Tech2 on GM vehicles. Probably need encoder checked.
Answer #2Greg's Orange Auto (13269 Answers) , Orange, CA - (714) 361-9386globalhelper November 01, 2013, 06:28Master
have its scanned with a tech 11 scanner to get codes
Replybrockb, November 01, 2013, 07:38Rookie
It was a professional place and tool i believe. They said they could try the something else on another day. If it was something not too difficult i can do on my own but dont own the computer stuff.
Answer #3cardocIII from Gillespie's Auto Service, November 01, 2013, 08:15Master
I just did one last week and you really do need the TechII for diagnostics on that system. On the one that I had the module itself had failed and it wasn't communicating on the data bus with the other modules and having the factory tool allowed me to see that right away on the class2 message monitor and really made the diagnostics much easier.