Jump to content

Service 4WD Light

aggietke00
 Share

Recommended Posts

19Sierra Enthusiast

19Sierra

Posted
Posted (edited)
3 hours ago, Mariah Forar said:

The dealership told me that the transfer case was "confused" and didn't know what driving mode it was in so it ended up getting stuck in 4HI causing the rear diff to slip and the truck wouldn't drive forward at all. I was told they had to re-program the transfer case control module so basically meaning they reset it?? and I was told it's good to go... Well we'll see. If it comes down to a computer getting confused then like any phone or laptop, which happens quite often, we reset those when they get "confused" but with my truck, I had to get it towed yesterday because the computer was confused??? Ridiculous. I'll be waiting impatiently for a recall notice.

Good luck hopefully that fixes yours ( although mines still driveable). They did the realern on mine last week and it still is showing up after.

Edited by 19Sierra
  • Replies 139
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

Pinnacle
Pinnacle

Yes, we've had 3 trucks and done them all with no questions asked. Our dealerships always tries to go above and beyond. 

Mariah Forar
Mariah Forar

1/27/19 @ 5:35 am my truck threw this code.. "Service 4WD" after attempting to switch it from AUTO to 2HI. I was not moving, the truck was in neutral and I had just driven it the day before about 100

Colossus
Colossus

No.  They have their fair share of issues.  If you want a truck with fewer issues, go back about 10 years to the GMT-900s (without AFM) or even the GMT-800s.  Find a low millage and you'll have a GREA

Posted Images

Pinnacle Enthusiast

Pinnacle

Posted
Posted
On 1/25/2020 at 1:33 AM, Colossus said:

Not according to the NHTSA. 

Im still waiting on your NHTSA numbers that they dont provide.  IF you dont know just shut it. 

BlancoSilverado Enthusiast

BlancoSilverado

Posted
Posted
On 1/28/2020 at 5:32 AM, Mariah Forar said:

The dealership told me that the transfer case was "confused" and didn't know what driving mode it was in so it ended up getting stuck in 4HI causing the rear diff to slip and the truck wouldn't drive forward at all. I was told they had to re-program the transfer case control module so basically meaning they reset it?? and I was told it's good to go... Well we'll see. If it comes down to a computer getting confused then like any phone or laptop, which happens quite often, we reset those when they get "confused" but with my truck, I had to get it towed yesterday because the computer was confused??? Ridiculous. I'll be waiting impatiently for a recall notice.

How can the rear Diff slip? I think that there is some else causing the problem and they do not know how to fix it.

  • 2 weeks later...
gabela New Member

gabela

Posted
Posted

HI everyone,

 

I am part of this too. Bought a LT trailboss last June and mine was stuck on 4-LO today as I pulled out of my driweway after a snowstorm. For some reason I don't understand although it is stuck in 4-LO the front axle doesn't get any power. That 60k$ truck stuck on rear wheel drive LO gear in deep snow wasn't going anywhere....Had it towed to the dealership...I will let you know what is the problem once they find it. 4wd warning service light is on

What is even more curious, the loaner I have for the weekend  had an amber 4-Hi light with the service 4WD light popping up on my way back from the dealership. It disapeared after a couple miles but still very weird. It cannot be a simple coincidence.

 

Good night

19Sierra Enthusiast

19Sierra

Posted
Posted

Mine is currently at the dealership and they are trying to figure out why this is happening. Dropped it off Thursday night. Will update when I have more information.

Taaaday New Member

Taaaday

Posted
Posted

I have an 18 2500 with the DMAX, currently having the same issue. Truck has 34k miles, and didn’t have any issues until last oil change at dealer. I assume they did an update and a week later the “service 4wd” message came on. I have an appointment at my local dealer tomorrow and will let everyone know what they say. 

19Sierra Enthusiast

19Sierra

Posted
Posted

Starting to lose my patience with this dealer. Was told they cannot duplicate the issue so far (dropped truck off last thursday night with the service light on). Was told that if you shift the transfer case in park than it will throw that light everytime as the transfer case is not supposed to be shifted with the truck in park. I'm calling bs on that. And even if that was the case than they should be able to get an active code fairly easily than. The light has come on when driving as well as when switching out of auto when I pulled into the garage. Was also told that they need the loaner back as it has been sold. When I asked what there plan is now for the truck I was told that since they dont have another loaner available that they will let me keep it for one more day and they will try to duplicate again tomorrow. 

1997SierraSLT Enthusiast

1997SierraSLT

Posted
Posted
28 minutes ago, 19Sierra said:

Starting to lose my patience with this dealer. Was told they cannot duplicate the issue so far (dropped truck off last thursday night with the service light on). Was told that if you shift the transfer case in park than it will throw that light everytime as the transfer case is not supposed to be shifted with the truck in park. I'm calling bs on that. And even if that was the case than they should be able to get an active code fairly easily than. The light has come on when driving as well as when switching out of auto when I pulled into the garage. Was also told that they need the loaner back as it has been sold. When I asked what there plan is now for the truck I was told that since they dont have another loaner available that they will let me keep it for one more day and they will try to duplicate again tomorrow. 

one would think an intelligent GM engineer would build this logic into their software.

19Sierra Enthusiast

19Sierra

Posted
Posted
4 minutes ago, 1997SierraSLT said:

one would think an intelligent GM engineer would build this logic into their software.

You would think. They've gotten the same code 4 times. Now they tell me that it is always a history code not an active code and that they cant do anything unless it's an active code. So At first I'm told they cant do anything unless there's a code. Now that there is a code I'm told it's the wrong kind of code. Seems they are trying all they can to get me to just live with it. That's not gonna happen. 

Taaaday New Member

Taaaday

Posted
Posted
On 2/10/2020 at 6:31 PM, 19Sierra said:

You would think. They've gotten the same code 4 times. Now they tell me that it is always a history code not an active code and that they cant do anything unless it's an active code. So At first I'm told they cant do anything unless there's a code. Now that there is a code I'm told it's the wrong kind of code. Seems they are trying all they can to get me to just live with it. That's not gonna happen. 

I took my 18 2500hd in today and got told the 4wd actuator is going out on the new trucks like crazy. I was told it would take 2 days to get it in. So be ready for the 4wd light to come on

KyAT4 New Member

KyAT4

Posted
Posted
On 12/24/2019 at 11:45 AM, Ksalway said:

Scheduled an appointment for mine can’t get it in until December 30th. Any luck on your part coming in? The service 4wd message has come on 4 times now but clears itself

 
Still haven’t gotten the new TCCM.  It’s been over two months that it has been on order. Tonight while the truck was in 2WD the warnings and messages came back. The parking brake also did not want to disengage automatically when putting it in gear and giving a bit of gas. 
KyAT4 New Member

KyAT4

Posted
Posted
 
Still haven’t gotten the new TCCM.  It’s been over two months that it has been on order. Tonight while the truck was in 2WD the warnings and messages came back. The parking brake also did not want to disengage automatically when putting it in gear and giving a bit of gas. 
Ksalway Enthusiast

Ksalway

Posted
Posted
7 hours ago, KyAT4 said:
 
Still haven’t gotten the new TCCM.  It’s been over two months that it has been on order. Tonight while the truck was in 2WD the warnings and messages came back. The parking brake also did not want to disengage automatically when putting it in gear and giving a bit of gas. 

Mine is going back in Monday now to get an update to the tccm. 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.6k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,993
    Total Members
    8,960
    Most Online
    President Roberto
    Newest Member
    President Roberto
    Joined

  • Who's Online   0 Members, 0 Anonymous, 224 Guests (See full list)

    • There are no registered users currently online

  • Latest Articles

  • Posts

    • bwiese
      upgrading speakers on 2026 std cab WT...

      By bwiese · Posted

      I don't wanna do major surgery/upgrades, behind-the-dash work, add amps, change radio etc. on my '26 std cab WT. On the WT, it has the base 7" IOR infotainment setup, and only two speakers (doors). Since I listen to classical, looked around for speakers that do well and dug thru reviews. Two-way speakers were found to be better than 3-way. So I've ordered a pair of  Infinity Reference REF-9632IX 2 way speakers.  [These may  or may not have been discontinued / succeeded by the 3-way ...9633 ones.]    These speakers are lauded for 3 ohm and 94db sensitivity spec so they'll work well for ordinary base car radios without amps and offer better performance (quality,  strength) than  default base paper-cone speakers. They'll be installed in a few days and I'll let y'all know what I think. Bill W San Jose      
    • RyanbabZ71
      RyanbabZ71's 2019 High Country

      By RyanbabZ71 · Posted

      Thanks!   Changed out the rear shocks today to Bilstein 5100s.  So far feel much better. The stock Rancho were wore out.  Lots of heavy hauling (2 moves, home renovations, etc).  Next up is new BFG tires Monday.  Cant wait the current tires have little to no wet traction and are super loud (hum)    
    • Snowcamo
      No high speed fans...

      By Snowcamo · Posted

      Ok, I got the all the codes. What do you all think would be a place to start?
    • Chuck FB
      Correct way to service 2024 l8t allison trans?

      By Chuck FB · Posted

      How about I just point to the factory pans stand pipe little drain plug and claim its a pan with a real drain plug !. I just couldn't swallow the fact that a Dorman pan which at this point is probably the only pan out there that fits the gas version truck cost that much up here in Canada so I decided initially anyway to skip it and see what I thought of pulling the pan method and down the road if I felt inclined enough then I would either install a drain plug kit in the factory pan if there is enough room for it, or have a bung welded onto it, or put an aftermarket pan on. The thing is if the pan is not pulled then the magnets in the pan can't be inspected and cleaned or if wanting to change out the filter. However of course it certainly would make the job easier to be able to drop the oil first before having to handle the pan if dropping the pan that go around was the goal.    I knew a guy locally that was doing custom field spraying years ago with a pickup pulling a ground driven sprayer, I believe it was a GM pickup with an automatic trans. He had a drain plug in his pan and would drop the oil out of it once a week and top it back up through the dipstick tube to keep refreshing a portion of the oil often and that made the transmission last far longer than had he done nothing. Soft fields pulling 500 gallons of water at the start of each mixed up sprayer tank batch and in low range sucking along. I imagine he got some tips from other custom sprayer outfits doing the same thing at the time and learning from their blown up tranny mistakes. Transmissions then had no lock up converter so would cook the crap out of the fluid slipping that much and it would not have been synthetic fluid either. 
    • KARNUT
      Gas Prices

      By KARNUT · Posted

      3.39 Kroger’s in Montgomery Texas. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...