I have a 99 silvarado with 5.3 The service 4 wheel light comes on periodictly.Changed all the fluids,but did not help.Any suggestions

there are magnets on the backside of each rotor.do u get a strange sound from any of wheels? thats the bad one.

Was the transfer case fluid changed every 50K miles? This very important on these trucks. The Transfer Case Control Module (TCCM) could be at fault, especially since you have no lights on the selector switch. Is the Service 4x4 light on? When you switch from 2H to any of the 4 wheel drive selections, do you hear any actuator noises coming from under the truck?

check fuse and relay to switch if power to switch retest switch new doesnt mean not defective if no power check connections and wiring for damage or breaks

What does it mean when the Service 4 wheel drive light come on?

The service 4 wheel drive light is indicating a part failure in the 4 wheel drive system.
Take your vehicle to your local Auto Zone or Advance Auto Parts and ask them to scan your Tahoe for trouble codes. The code will help to determine what the component failure is and you can start diagnosing at that point.
Write the code down and reply back, we can go from there.
Good luck.
Regards,

I have this same problem with my 1996 Subaru Legacy 2.2 Wagon. There is a Subaru Service Bulletin #16-62-97 dated 5/16/97 with a Subject entitled "Transfer Clutch Binding And/Or Bucking On Turns". There is also an important follow-up to it numbered 16-64-99 dated 09/15/99 entitled "Revised Transfer Clutch Assembly Replacement Procedures" that should also be used should you decide to go ahead with the transfer clutch replacement.

I just got these Service Bulletins from my mechanic who got them from a Subaru dealer.
The estimate was about $700-$1000 to fix. This is more than likely the cause of the binding problem on slow, sharp turns.

Dan Hunt
Danbury, CT

If it has auto 4x4. which will have 4 push buttons on the dash it will take auto trac fluid that you will need to get at your local GM dealer. A regular transfer case will take Automatic transmission fluid.

My 2003 yukon xl does the exact same thing. Sorry that I do not have a solution, but I figure its the same reason the daytime running lights always burn-out. The SUV in general has be an absolute POS and I will never buy another.

The 4 wheel drive actuator motor is not working, that is why the message, they stick if they are not used very often.

its a possibility that the transfer case might be going out or the fluids in it are bad sometimes after alot of mileage the tranfer case will slip or stick