Service 4WD

[DareDog]

2005 1500 5.3L with 73K on it the "service 4WD" came on the dash and 4x4 did not work. once shut truck off and started it the 4x4 worked. not sure what that means? some times the swtich dose not light up at all. wondering what it could be?

[Stevens03]

The switch could be going bad... not uncommon.

[DareDog]

Where is the switch?

[gmtech4]

get it scanned first ,do not start throwing parts at it ,,do it right ...

 

the msg means there is a code

[DareDog]

now none of ligts light up on the dash (2wd 4x4 hi low auto 4wd) what dose that mean?

[gmtech4]

get it scanned ,check the fuses ,thats it ,computor controlled system

[kjbula]

My 2000 did the same thing. Service 4x4 light came on and I couldn't switch out of 2wd. This seems to be a very common issue with these switches. Easy fix if you can solder.

 

Remove switch from dash (yes, the switch you use for auto, 2wd, 4wd hi/low) open the back of the switch carefully using a small flathead screwdriver. Remove some of the old solder from all the contacts (I think mine had nine contacts), resolder then reinstall. I did this over 2 years ago and have no issues since.

 

If you can't solder, buy a new switch. Rockauto.com has a switch for my 2000 for only $32, dealer price was $50.

 

I would try the switch first before I paid $80+ for a diagnosis.

[dakota29]

My 2006 did the same thing... I tried the solder trick on the switch, but did not fix. Mine ended up being the transfer case position senser. Part was about $100 from the dealer (only place to get it, NAPA and the like don't carry it). Changing it wasn't bad, some people say to drop the drive shaft, but I put the transfer case in neutral and was able to turn the drive shaft around a bit and wiggle out the housing that holds the position sensor. If your not really mechanically inclined I don't know that I would recommend doing it your self, but it is possible.

 

Search this site for the transfer case position senser (sensor) and you will find a ton of information. I know somebody posted pictures of it at some time, I don't remember where, might have been a tech article.

 

Hope this helps......

[RJNehus]

My 2006 did the same thing... I tried the solder trick on the switch, but did not fix. Mine ended up being the transfer case position senser. Part was about $100 from the dealer (only place to get it, NAPA and the like don't carry it). Changing it wasn't bad, some people say to drop the drive shaft, but I put the transfer case in neutral and was able to turn the drive shaft around a bit and wiggle out the housing that holds the position sensor. If your not really mechanically inclined I don't know that I would recommend doing it your self, but it is possible.

 

Search this site for the transfer case position senser (sensor) and you will find a ton of information. I know somebody posted pictures of it at some time, I don't remember where, might have been a tech article.

 

Hope this helps......

 

 

Hello,

 

Did your truck loose power while the Service 4WD light was on. Mine is on and the truck, randomly looses power, wont go over 25mph. But then you turn the truck off then back on and it might drive fine or not. Does anybody have any experience with this issue?

[gmtech4]

My 2006 did the same thing... I tried the solder trick on the switch, but did not fix. Mine ended up being the transfer case position senser. Part was about $100 from the dealer (only place to get it, NAPA and the like don't carry it). Changing it wasn't bad, some people say to drop the drive shaft, but I put the transfer case in neutral and was able to turn the drive shaft around a bit and wiggle out the housing that holds the position sensor. If your not really mechanically inclined I don't know that I would recommend doing it your self, but it is possible.

 

Search this site for the transfer case position senser (sensor) and you will find a ton of information. I know somebody posted pictures of it at some time, I don't remember where, might have been a tech article.

 

Hope this helps......

 

 

Hello,

 

Did your truck loose power while the Service 4WD light was on. Mine is on and the truck, randomly looses power, wont go over 25mph. But then you turn the truck off then back on and it might drive fine or not. Does anybody have any experience with this issue?

 

 

sorry bud ,your problems are not related ,,get your truck scanned ,this has been a recording !!!

[scottmoyer]

When you say the truck loses power, is it after you tried messing with the switch? I realized that if I hit the switch when the Service 4x4 light comes on, the next time you start the truck, it might be in 4-lo. Try resetting the switch to 2 hi if it is an intermittent issue.

[gmtech4]

When you say the truck loses power, is it after you tried messing with the switch? I realized that if I hit the switch when the Service 4x4 light comes on, the next time you start the truck, it might be in 4-lo. Try resetting the switch to 2 hi if it is an intermittent issue.

 

 

sorry scott ,it doesnt work that way ,message means that the system has a fault and WILL NOT shift untill its fixed,it cant start out in 4low unless its in 4low to begin with,,idk wth ya mean ,,

doesnt matter ,

 

get it scanned OP !!!!

[scottmoyer]

Ok, let me simplify my response by elaborating a little.

 

If I start my truck and the Service 4WD message came on, sometimes the 2WD HI is lit up and sometimes the entire module is dark. If you try changing the setting to see if the switch responds and it doesn't, be aware that the next time you start your truck, the switch might set to the last button you pushed when testing the switch. My switch is intermittent. If I start the truck and get the message, I may turn off the truck and restart it. By doing that, the switch now works and allows me to go into 4HI or AUTO, etc. I have noticed that if I start my truck and get the message, pressing a button does nothing. If I press 4HI as the last button, then restart my vehicle, I've noticed that when the switch does respond, it's now in 4HI. Understand?

[gmtech4]

your not listening to me !!!

 

get it scanned ,,,,,,you understand that ?

 

i dont care what it does ....its messed up

 

THERE IS A CODE IN THE T.C.C.M.

 

the switch is not a module

 

get me a code and i"ll look it up for you !!!!! if im still vertical !! lol

[RyanbabZ71]

your not listening to me !!!

 

get it scanned ,,,,,,you understand that ?

 

i dont care what it does ....its messed up

 

THERE IS A CODE IN THE T.C.C.M.

 

the switch is not a module

 

get me a code and i"ll look it up for you !!!!! if im still vertical !! lol

 

+1

 

 

Ryan