4wd service codes.

[andyems]

I tried to change my Hypertech MaxEnergy programmer settings today, and it told me I have 4 DTCs. They are all related to my 4wd system but it seems to be working fine. I used 4-Auto a few weeks ago and it seemed to work fine and all the switch lights are burning correctly. Here are the codes I got from my programmer and the explanation I found online, although I don't know what they mean. Anyone have any idea what these mean? It's a 2007 GMT-900 Silverado. Thanks in advance for the help.

 

 

B0785 - Two Wheel Drive High Range (2HI) Indicator Circuit

 

 

 

B0780 - Four Wheel Drive Low Range (4LO) Indicator Circuit

 

 

B0770 - All Wheel Drive (AWD) Indicator Circuit

 

B0775 - Four Wheel Drive High Range (4HI) Indicator Circuit

[gmtech4]

clear them,go for a rip and see if they come back ,there is a dimming system involved ,there is alot involved in the diagnoses and replacing the switch is not the first thing to do if they (codes) come back

 

there is no default or even a service 4wd message for those codes,hence the normal operation