Jump to content

Service 4wd & 4wd Switch Lights Out

skellatores

Recommended Posts

skellatores Enthusiast

skellatores

Posted
Posted

Turned the truck on today, 2003 Sierra 2500hd diesel and not only is my 4wd switch not lighting up but the service 4wd message is on the cluster. This is a really bad time too cause we just got a bad snow storm. I asked a few friends around and they said it could either be the switch itself or the sensor on the transfer case. They also said that i have to go to the dealer in order to get a scan so ill have to wait till monday and drain my bank account too. What do you guys think it could be? Ive checked all the fuses i think might be linked to the 4wd and they all seem fine. Any ideas, I scanned through the forums and couldnt really find anyone that has had all their lights go out like mine.

 

Any advice would be appreciated,

 

Thanks.

Kyle.

alwcurlz Enthusiast

alwcurlz

Posted
Posted
Turned the truck on today, 2003 Sierra 2500hd diesel and not only is my 4wd switch not lighting up but the service 4wd message is on the cluster. This is a really bad time too cause we just got a bad snow storm. I asked a few friends around and they said it could either be the switch itself or the sensor on the transfer case. They also said that i have to go to the dealer in order to get a scan so ill have to wait till monday and drain my bank account too. What do you guys think it could be? Ive checked all the fuses i think might be linked to the 4wd and they all seem fine. Any ideas, I scanned through the forums and couldnt really find anyone that has had all their lights go out like mine.

 

Any advice would be appreciated,

 

Thanks.

Kyle.

 

 

I had that problem too. Found on the net it was a solder connection problem on the 4WD push button panel. Was a pretty easy fix. Just removed the dash bezel, control panel. Took the 4x4 control panel apart and re-flowed the solder on the connector pins where the wire harness connects to. The problem stems from an issue where the wire harness is hanging on the connector pins that are soldered to the board, eventually working them loose.

Hope this helps!

skellatores Enthusiast

skellatores

Posted
  • Author
Posted

so i took out the switch unit and opened it up. the soldering you did was on the pins (mounds on the board)?

they look fine, but if that's what you re-soldered then i'll give it a shot.

alwcurlz Enthusiast

alwcurlz

Posted
Posted
so i took out the switch unit and opened it up. the soldering you did was on the pins (mounds on the board)?

they look fine, but if that's what you re-soldered then i'll give it a shot.

 

Yes, the pins in the board can come loose and not look obvious, similar to a cold solder joint. It won't hurt to reflow the solder. Let us know the results!

skellatores Enthusiast

skellatores

Posted
  • Author
Posted

Okay, so i re-soldered the pins on the board and it didn't seem to work. I plugged it back in and turned on the truck and no lights came on and there were no options for 2wd or 4wd. I'm gonna try this thread http://truckmodcentral.com/forums/showthread.php?t=2290 first and then ill resort to the dealership.

The price of these parts will be the same price to put the truck on a computer so ill try this first and then go from there.

Thanks for all your advice.

Ill let you guys know what ended up happening.

 

Thanks to BigRedMariner for the other thread.

 

Kyle.

skellatores Enthusiast

skellatores

Posted
  • Author
Posted

So I had the transmission scanned for $105 and they told me it's the worst one, The Transfer Case Control Module. It's gonna run me around $900 for the part and a hour of labor to install. I was hoping it was either the switch or the sensor but no luck.

Paxonator Enthusiast

Paxonator

Posted
Posted
So I had the transmission scanned for $105 and they told me it's the worst one, The Transfer Case Control Module. It's gonna run me around $900 for the part and a hour of labor to install. I was hoping it was either the switch or the sensor but no luck.

 

I had the exact same problem as you last week. I had no lights and it said service 4wd. I searched on here and found the atc fuse had blown. replaced that and it's worked fine every since. Not sure why the fuse went out though...

alwcurlz Enthusiast

alwcurlz

Posted
Posted
So I had the transmission scanned for $105 and they told me it's the worst one, The Transfer Case Control Module. It's gonna run me around $900 for the part and a hour of labor to install. I was hoping it was either the switch or the sensor but no luck.

 

I had the exact same problem as you last week. I had no lights and it said service 4wd. I searched on here and found the atc fuse had blown. replaced that and it's worked fine every since. Not sure why the fuse went out though...

 

 

Hope it doesn't cost joooo $900+ for a fuse. :)

alwcurlz Enthusiast

alwcurlz

Posted
Posted
Hope it doesn't cost joooo $900+ for a fuse. :rolleyes:

 

Sure hope not, although it did get really cold just before it happened. Like for example today it's -42C here

 

 

I think that if components get seriously cold, they won't want to move being too stiff and stuck. A motor trying to operate a stuck component would either blow a fuse or burn out the motor.

hitempguy Enthusiast

hitempguy

Posted
Posted

If your'e in Edmonton, (something about the -45C) send this guy a email, he is awesome. [email protected]

He diagnosed my 04' sierra 1500 crew,over the phone. I had exact same problems and the tcase was toast and the encoder motor was failing/failed causing the tcase apply clutch to fail, then the apply clutch bearings ended up in the bottom of the case which led to a shifter fork breaking. 800.00 for my NP246 with a "real" oil pump case saver and Morse Hy Vo chain, new clutches and bearings....

 

encoder motor was failing/failed - thats why my fuse went, could be a encoder motor sensor short. you could just replace the sensor, but the little gears inside rotate back and forth constantly, so IMO while your there, under the truck eating dirt, put a new one in. Craig can get a new aftermarket for 250.00

Everything works excellent now

alwcurlz Enthusiast

alwcurlz

Posted
Posted
If your'e in Edmonton, (something about the -45C) send this guy a email, he is awesome. [email protected]

He diagnosed my 04' sierra 1500 crew,over the phone. I had exact same problems and the tcase was toast and the encoder motor was failing/failed causing the tcase apply clutch to fail, then the apply clutch bearings ended up in the bottom of the case which led to a shifter fork breaking. 800.00 for my NP246 with a "real" oil pump case saver and Morse Hy Vo chain, new clutches and bearings....

 

encoder motor was failing/failed - thats why my fuse went, could be a encoder motor sensor short. you could just replace the sensor, but the little gears inside rotate back and forth constantly, so IMO while your there, under the truck eating dirt, put a new one in. Craig can get a new aftermarket for 250.00

Everything works excellent now

 

What do you mean by "real oil pump case saver and Morse HyVo chain"?

  • 2 weeks later...
philzinn Enthusiast

philzinn

Posted
Posted

I just got back from the dealer, $700 poorer for a new TCCM. Was having the same problems with service 4WD light coming on. Was a CO324 code. Had problem also that the truck would draw all power out of the battery in 2 days. It was excessive draw by the TCCM.

  • 1 year later...
1999Yukon New Member

1999Yukon

Posted
Posted
I just got back from the dealer, $700 poorer for a new TCCM. Was having the same problems with service 4WD light coming on. Was a CO324 code. Had problem also that the truck would draw all power out of the battery in 2 days. It was excessive draw by the TCCM.

I know this is an older thread but same thing is happening to my Yukon right now. Got home tonight and the truck stalled. Tried to start it and it was like the life was sucked out of the battery. All kinds of clicking noise coming from under the dash. Service 4wd light has been coming on for a while, time to do something about it now. Luckily I can get a used TCCM from a wrecker for $125, about the same price as the dealership charges for the test. Have already checked the 4wd switch and replaced the encoder motor.

Hope this helps someone else down the road.

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • C/K Man
      Silverado 4500-5500-6500 are they still being produced? Would have sold better as GMCs as well

      By C/K Man · Posted

      There was talk over the last couple of years that the contract to build these trucks between GM and International would not be renewed.  International moved production of all their other trucks besides the companion CV model out of the Springfield plant some time ago when they opened their San Antonio plant.  That left Springfield only building the Silverado Medium Duty, International CV Series, and some Express/Savanna long wheelbase cutaways.  International also put the plant up for sale some time ago.  This all answered my earlier question as to why GM and International did nothing with these trucks since they were introduced, as they had basically become a market 'placeholder' with a finite life.    The Silverado Medium Duty/International CV trucks were interesting combination of a GM powertrain, electrical system, and K2XX Silverado cab with an International chassis that was supposedly designed for a step-van type vehicle they never produced.  They were manufactured in International's Springfield plant along with the IH MV series initially.  When first introduced, there was much talk that the Silverado Medium Duty/CV would eventually get a gasoline engine option along with other upgrades and GM and IH would work on a class 6/7 joint venture truck.  This was before VW bought Navistar out, after that happened no more was said.  Draw your own conclusions...   About the time talk started that the GM/IH joint venture was not going to be renewed, rumors started that GM would develop a new line of medium duty trucks themselves.  The story is the new trucks will be part of the next generation HD's due in 2028, and will still feature a 'straight rail' chassis design that the current medium duty has.  GM views this as a desirable feature that differentiates their truck from the competition.  A gasoline engine option is also expected.  As the current Silverado Medium Duty remains in production until September 2026 and there is still a lot of inventory available do not expect any official word for some time.   I believe GM remains committed to their successful partnership with Isuzu, and all the LCF models will still be available from Chevy Commercial dealers.  Isuzu is on the cusp of opening a new large plant in South Carolina and there is also speculation that this may result in new product for both Isuzu and Chevy Commercial dealers.                  
    • davester
      push to talk button

      By davester · Posted

      drive the truck back to the dealer and complain that the button works.
    • davester
      push to talk button

      By davester · Posted

      drive the truck back to the dealer and complain that the button works.
    • nfisherman
      Software Update

      By nfisherman · Posted

      I have a 2026 2500 HD Ultimate. My phone app says there’s a software update available. It’s something about improved battery management and something to do with the running boards. I follow the instructions for the update but the “Check for Updates” option is greyed out in my settings menu. Has anyone else seen this? How did you resolve it? The help message just says “see your dealer” if the download doesn’t work. I’m just trying to save a trip. 
    • newdude
      Exhaust Question

      By newdude · Posted

      Fuel mileage?  That's all how you use your right foot.  Exhaust will give you sound.   Stock exhaust 5.3 is 2.75" diameter piping.     If the truck is nice and worth putting some $$ into it, I'd go for a Corsa catback.  I had one on my 2019 old body 5.3 and it was just perfect.  Zero drone, just driving around and cruising on the highway you'd think it was stock, but when you opened it up it was like a Camaro with the factory dual mode.  Corsa bumps their catback to 3in diameter.  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...