"Service 4X4" light is coming on but there is no diagnostic code when daignostic computer is connected. I had this problem initially on vacation, added fluid to 4X4 dif, noticed that seal was leaking also. Took it to mechanic I trust and had difs, transmission, and transfer cases serviced, also needed new seal, and u joint replaced. The light still comes on when it wants, also having problems with getting it to shift into any 4 wheel position.


Thanks for your response

What did it cost for front axil seal replacement i have one leaking at the pumpkin...JJ

I was having a problems on my 2000 silveraldo The service 4X4 light would come on the l2 high light would go out and wasnt coming back on but the 4X4 was working My problem was the switch in the switch for the 4X4 (Auto 2high 4high etc.) The switch is $55 and very simple to install i havent had a problem since

I believe i have the same exact problem. I get the service 4x4 light every now and then and sometimes i notice that the 2HI light is very dim or not on at all, but i never have any problems with it going into 4x4. I'm glad to hear that the switch is only $55 bucks

jake

There have been several having problems with the 4WD selector switch. They have cracked solder joints on the back of the connector pins. If you solder, this is an easy fix. Remove the dash trim, remove the switch, seperate the back housing from the switch and look very closely at the solder joints on the back of the 12 (I think) pins. There were hairline cracks on 6 of mine. I resoldered all pins and haven't had a problem since.
Rick

i see you guys talkin about the whole service 4x4 on silverados and my 03 sierra is doing the same thing do you guys think i have the same problem with my switches (auto 4x4, 2 hi, 4 hi, 4 low) or what?


syptoms: i started it service 4x4 came on none of the swich lights (auto 4x4, 2 hi, 4 hi, 4 low) came on could not get into 4x4 dident know what happin they came back on after 2 days this happe 2 mo. ago. sim. thing happen today service 4x4 came on again but switch lights (auto 4x4, 2 hi, 4 hi, 4 low) were on and i can get into 4x4.