jdugan

What does it mean when the notice pops up "Service 4wd". My understanding is that it means to change the Transfer Case fluid. Well I did that recently and the light is message still frequently pops up. Anyone have any idea what it could mean? Do you have to reset it when you change the Transfer Case fluid???

eku93

I don't think it has anything to do with the oil changing, but I can tell you that if you are having problems with the electronic transfer case shifting actuator, it will cause the Service light to come on. This actuator doesn't only shift the transfer case in to 4WD (Hi and Lo), but if iyour truck is totally electronic (All Push Button w/Auto 4WD), it also has a 6 wire sensor on the actuator to tell the computer what position the actuator is in and that's what's lights up beside the selector swich on the dash. The connector can sometimes get dirty, and worse case, go bad on you. Just a few pointers. Let me know if I can help further.

ChevyLover247

I recently had the same problem with my '04 Silverado...
The transfer case module control had to be replaced.

jdugan

how much was it to replace the transfer case module? do you need to replace it?

vnotaro

Quite often it is the switch on the dash thats the problem. It also happens to be the easiest and cheapest fix.

Sonny01

Take it out of your dash, open it up and resolder the wire connections. Look for little cracks around the solder joints, that's the problem. It's easy...I did it to mine and it's works perfectly.

16th hippy

there is also the encoder motor...the actuator that shifts the transfer case between gears, and senses what gear it is in and such. This is an easy fix work wise, but i can't remember the cost of the part. see if you can get a code out of it....if autozone's scanner can't read it, or if it gives you a code but no explination, then post the code ####'s here, and we can figure it out from there.

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Disclaimer: I am not perfect, i may be wrong in my advice from time to time. Also note that any advice given is as is with no warranty whatsoever, and i have zero liability if you get hurt for not being safe while working on your vehicle.

MonteSSman

A guy at work had the same message on his 99, and his ended up being the push button switch. He had his repaired at the dealr so I don't know the cost.

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00 Silverado LT Z71, 5.3L, K&N Gen II, Corsa exhaust, remote starter, Kenwood CD, 10" audiobahn under rear seat, billet grill, spray in liner, SS nerf bars, soft bed cover, Dueler Revos

'96 Corolla DX. 1.8L, AT. Pioneer, Infinity speakers, 10" JBL. Bought new, now with 180,xxx mi!!! Very pleased

'83 Monte Carlo SS

jdugan

Thanks for the help. I will check out Autozone and see if they can't give me a code.

grego10r

hi guys i get the same thing but my blows the atc fuse

16th hippy

could be a short to ground inside the encoder motor, or short to ground somehwere in the wiring.

grego10r

guys went to the dealer and they sad its Transfer Case Actuator Motor is there any way to fixit i found one on ebay for 200$ brend new the deler wants 690$ FOR IT and gm parts direct its a ripoff they haveit for 370$ but they want 88$ for shipping fuck them the ebay # isItem number: 180040162752 let me know what you thing or should i go whit oem from gm thanks

2000z71stock

SERIOUSLY! Before you do anything, I had that problem ("service 4wd") on my 00 z71. I took the switch out, and heated up the terminals on the back, and dropped some new solder in them . IT WORKED! They just have some bad connections I guess.

The "service 4wd" light had been going on and off intermittently for a long time. Then it decided to stay on. I did that fix, and it hasnt come on again for over 3000 miles.

Just to add... I did the same thing with my remote mirror button... worked for all but both mirrors "right tilt" function, for lack of a better term. Still cant get them to turn right...

Thanks to ALL who post here... y'all can save us all some serious .

grego10r

its fix it was the Transfer Case Actuator Motor got it new for 330$ and its working good its like 1 hr job i save $ dealer wants like 697$ fot it eather the motor or the switch if yours blows the atc fuse its the actuator motor an the transfer case the guy i got the part sed it gose bad evry 80.000mils