jakesheena1314

My service four wheel drive light came on in my truck and I had it checked by a dealer. They said the controller motor needs to be changed. I did that and the only difference now is the check four wheel drive service light is not on. I also switched the dasboard switch. So now I still have a non working four wheel drive. What else could be causing the lights to not work on the switch panel in the truck?????? So I am stuck. any advice would help. thanks

Chevrolet Customer Service

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I'm sorry you are experiencing this issue with your vehicle. This may be related to an issue with the wiring harness. This is just a suggestion, not a diagnosis. I recommend consulting with a certified technician for an official diagnosis and repair option(s).

If you need assistance locating a technician near you, please PM me your zip code.

Louis
GM Customer Service

srwoolc

Jakesheena1314 -

I've got the same problem - it gets worse and worse over time. What controller motor needed to be replaced please?

I've had this before and have been told 'it gets dirty' and corroded and must be replaced. Well, $300 every year or two is getting old, so want to try to do myself this time.

kkosism

Try cleaning ground wire connection on frame,under driver side

kevinkpk

Only thing I can chime in on my 2000 suburban. I had to replace the switch, it was same symptoms as described. I could hear the shift motor/solenoid at times, and feel the transfer case shift. As suggested cleaning the ground connection, is the first thing to do.

Chredw

Ive got the same year model and same problem. The "service 4wd" light keeps coming on and when it does I cant engage my 4wd high or low. Sometimes I can turn truck off and back on and it will let me.

Surley someone has had the same problem and has the fix for it. If so please post for us poor chumps who cant afford going to the dealer everytime the wind blows.

AND the Chevy Reps who chime in on these topics, if you don't have any other suggestion besides "take it to the dealer" or "take it to a certified tech," DON'T POST AT ALL.

Moon Dog

Hello,

I own a 1989 3/4 ton extened cab 4x4 Silverrado. 4x4 will not engage, no light in console. Replaced the soleinoid/ acuator in transfer case. Didn't do anything. Does anybody have any ideas where I should go next to get my 4 wheel system working again ? Any help would be appreciated.

Glenn Larson

Ive been having the Service 4WD message on start up on my 01 Silverado, the push buttons don't light up or do anything. I replaced the push button switch but still had the problem. I took it in for service and they replaced the actuator and that didn't help so they removed it, said i needed a rebuilt or new Transfer case. I didn't replace it. then one day it worked and i told them there must be some corrosion on the wiring, or a corroded connector. They checked that and then said i need a new TCCM transfer case control module. I kept reading about shutting the engine off and restarting it. that didn't work. Then i tried a different routine for starting, I turn the key to the run position and watch the lights on the push buttons and when they settle down, start the engine. I have done that the last dozen times, then when i start the truck. the Service 4WD message stays OFF and the push button Auto 2WD hi low 4WD selector switch works every time. After ignoring all the list of possible cures this WORKED I think a lot of electrical problems come from poor connections and by replacing a $200 whatzit the connections have to be re seated and the component works, dah, and didn't need to be replaced after all. Maybe there is another explanation for why this worked. Id like to hear about it.