I have a 98 GMC Suburban K2500 3/4 ton 5.7 engine, Auto, 4wd (Push Button) The Transfer case has just had a complete rebuild. I have installed a new dash switch for the 4WD, & also a new Control Module (Twice). What it is doing is the Service 4WD Light is stuck on & the truck is stuck in 4WD Low. I can hear it shifting when I try to change the position with the switch, but it blinks a couple of times and then the light goes on solid in 4WD Low.... ??????
SOURCE: intermittent 4wd on 98 jimmy
the module is what i would suspect. and i do believe it is in the r kick panel. i've seen the button pack on dash go bad too, but module is best bet.
SOURCE: Transfer case in 99 GMC Suburban
Hello
I had this with a C3500 4x4 it was the wiring contection at the transmission please test all these problems as ths may be a cheap fix.
Hope this helps
www.limotec.co.uk
Regards Paul
SOURCE: 1997 Suburban Transfer Case stuck in 4WD Lo
most likely needs an encoder motor. That is the fancy term for the motor that switches the t_case through the gears. The flashing lights indicate a code had been stored and you should have gotten it serviced then before further damage. as long as you dont drive it in 4 wheel you should still be ok
SOURCE: 2004 GMC Sierra 1500 4wd. Auto transfer case light issue
I have the same problem. It is intermittent and sometimes shows up with service transmission message. To get rid of it just put the truck in park, press the 2 high button and shift into drive while it is still flashing. I will worry about it more when it blows up. You can drive with the vehicle showing the solid neutral and it seems to make no difference. It has to be a wake up problem between the control modules. It only happens on start up.
SOURCE: my 98 suburban won't shift into 4wd, the service
check fuse if good need to check power at switch's possible loose wire behind dash or short
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