Jump to content

Service 4WD Light

aggietke00
 Share

Recommended Posts

Pancake0341 New Member

Pancake0341

Posted
Posted

Having the issue with the service message coming up in snow storms (WI) on my 2019 chevy 1500, they did a relearn on the transfer case and it didn't fix the issue. The dealer said they've had replacing the tccm fix it, but the most common issue is snow and ice building up around the sensor housing and once it heats up around the trans and transfer case, the ice melts with debris and trips the sensor. So, they've cleaned and resealed a few housings and that fixed their issues on a few. We'll see if that's what they do for me this time with mine, it's the second appointment I've had and I've made sure to take pictures of each instance of the code going off, so they can't tell me there's nothing wrong.

  • 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

Jay P Enthusiast

Jay P

Posted
Posted
4 hours ago, Pancake0341 said:

Having the issue with the service message coming up in snow storms (WI) on my 2019 chevy 1500, they did a relearn on the transfer case and it didn't fix the issue. The dealer said they've had replacing the tccm fix it, but the most common issue is snow and ice building up around the sensor housing and once it heats up around the trans and transfer case, the ice melts with debris and trips the sensor. So, they've cleaned and resealed a few housings and that fixed their issues on a few. We'll see if that's what they do for me this time with mine, it's the second appointment I've had and I've made sure to take pictures of each instance of the code going off, so they can't tell me there's nothing wrong.

Do you know which sensor?

Pancake0341 New Member

Pancake0341

Posted
Posted
2 minutes ago, Jay P said:

Do you know which sensor?

I'm not sure, they weren't very specific, I just got back from the appointment and he showed me a list about 200 pages long of gm updates they were sending out literally every other day for the tccm and transmission. They recently stopped on this new one because they claim it fixed the problem, it's supposed to snow about 4-6" tonight, so I should have a chance to check if it worked...

Jay P Enthusiast

Jay P

Posted
Posted

I agree with the sensor theory. I only have issues when there is a lot of road spay from the melting snow and temps below 25. Once I get up to highway speed the problem clears and the 4wd indicator goes back to white and the service 4wd goes out so ice buildup makes sense. 

 

Jay

JTC14 New Member

JTC14

Posted
Posted

I brought my 2019 Sierra in for service at 8000km and to check why the Service 4wd light kept coming on. Dealership ran diagnostics and said the 4wd module needed to be replaced. The truck has been in the shop since December 16th, I keep being told that the part is still being manufactured. I am beyond frustrated with GM at this point. I expect some serious reimbursement from GM to rectify this wait

Colossus Senior Enthusiast

Colossus

Posted
Posted
17 hours ago, JTC14 said:

I brought my 2019 Sierra in for service at 8000km and to check why the Service 4wd light kept coming on. Dealership ran diagnostics and said the 4wd module needed to be replaced. The truck has been in the shop since December 16th, I keep being told that the part is still being manufactured. I am beyond frustrated with GM at this point. I expect some serious reimbursement from GM to rectify this wait

you won't get any.  Don't ever get your expectations up. 

JTC14 New Member

JTC14

Posted
Posted

Picked it up today, 67 days later! Hopefully issue is resolved. GM is working on adding the 67 days back onto my warranty. Fingers crossed

Tymick13 Enthusiast

Tymick13

Posted
Posted

Dangit! It’s claimed another member. Happened to me today. Took the 2019 AT4 into a bad snow storm and after letting it sit outside for 5 hours. The E brake was on and so was the service 4WD light. After getting it home and into the garage. The light went off and after reading this thread I highly doubt it’s going to stay off. Thanks for the good info everyone.

Denali Driver New Member

Denali Driver

Posted
Posted

Hi Folks, Glad to hear this issue with "service 4WD" is not isolated to my 2019 Sierra Denali 1500. I First experienced it shortly after 3000Kms in wet snowy muddy highway conditions while in 4WD auto mode. The auto mode went from white to amber color and when i stopped the vehicle the E-Brake automatically applied. After driving on into better highway conditions the auto indicator light color, service 4WD light and E Brake all corrected itself. This has happen multple times since and i now have 12000 kms on the vehicle. I still haven't informed my dealer about this issue.

The other issue is with "rabbits" apparently they love to chew on my block heater cord. I've had to shorten that cord a couple of times and wrap it with duct tape.

Good luck everyone.

Jay P Enthusiast

Jay P

Posted
Posted (edited)

The only time I have an issue is when it's snowing and the roads are sloppy/slushy. It has something to do with ice coating or hanging on something. As soon as I get up to highway speed (stuff warms up) or all the stuff melts out from under the truck the issue is gone and the 4wd light is back to normal color. Unless the TCCM is somewhere it can get ice on it thats not the problem.

 

Jay

Edited by Jay P
hatchet669 New Member

hatchet669

Posted
Posted

I wonder if i'm starting to get the beginning of this problem. Other day i get out of the truck and i hear a bunch of whirring sounds. Sounded like transfer case motor. Next day the little icon on the dash that says 2WD was missing. Turned it off and on a couple times and it eventually came back on. This has happened a few times now, but no service 4wheel drive light yet. Did anyone notice anythign similar before?

19Sierra Enthusiast

19Sierra

Posted
Posted
On 2/15/2020 at 3:10 AM, Ksalway said:

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

Have you had any issues since they replaced your tccm?

Ksalway Enthusiast

Ksalway

Posted
Posted
28 minutes ago, 19Sierra said:

Have you had any issues since they replaced your tccm?

Nope light has not come back on, but the lights only come on during snow storms so no real way to tell if it’s a solid fix.

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

  • Latest Articles

  • Posts

    • BCGM
      Recalls 2024 Chevrolet HD

      By BCGM · Posted

      JW2024 and Others is this site for Oshawa built Trucks as well ? Thank You !
    • BCGM
      Remote Start Noise 2024 2500 HD Gas

      By BCGM · Posted

      Thanks JR that would be great if you could do that !!! Do you have a link to where this was discussed before ? I cant seem to find it  Thank You Again !
    • Another JR
      Remote Start Noise 2024 2500 HD Gas

      By Another JR · Posted

      Oil pump noise was discussed before.  I will try to remember to record a remote start later this morning. 
    • Chuck FB
      MPG at 600 miles

      By Chuck FB · Posted

      There are probably a few threads talking about fuel mileage but this one seemed to fit the stats I have seen based on my typical local driven route but with different outcomes based on different seasons/temperatures. I have a few hundred pounds of items that consistently ride on the truck at all times such as a bak flip cover, rubber bed mat, tools and extra fuel so I would be something over 8100 lb without me in the truck. All these examples are based on a 100 mile round trip to a town plus running around town so maybe 110 to 120 miles in total for a trip. Using regular fuel and I assume it always has some ethanol in it but don't know the percentage they blend in. Also speed wise I am going at 62 mph and non aggressive driving although less speed yet if its crappy winter condition roads. I am going by an initial reset of the computer generated fuel use numbers averaged over a couple of thousand miles or so for each weather/season so they may be more optimistic then actual hand calculated numbers. Basically this is painting a picture of doing the same drive but seasonal conditions and temperature being the major variable to the end result. Oh and although I am in Alberta Canada, I am converting it to miles per US gallon so there is no confusion.    So winter time it gets cold here, no real surprise there and the roads can be clear at times but also often have packed rough snow or are are driving through loose snow ( they do a poor job of plowing the highways ) and yes this includes the extra idle engine time due to trying not to freeze ones butt off. 12.7 mpg is what I was getting during the winter months on average.    Then during the spring when it was around the freezing point and the highways are clear of snow, I was getting around 14.25 mpg.   Summer time, I have been getting around 15.15 on average but certainly some of the trips showed quite a bit better fuel mileage, so much depended on how much or little I had driven around town and number of engine restarts after sitting for a while at each location. But stating a best fuel mileage trip to town pretending that is what the truck gets on average is fooling ones self for sure !.      As I said in a different post, I had driven a 645 mile trip over a couple of days stint to a different destination then these other daily to town examples above, and was done during the summer with nice weather and not bucking a head wind, also keeping at 62 mph and its a rolling landscape type highway drive ( this isn't southern Alberta or Saskatchewan flat lands ) Hand calculated fuel mileage in this case though and it came out to 17.65
    • Chris80s
      Factory front brake rotors...defect?

      By Chris80s · Posted

      On my wife's 2020 Blazer (~69000 miles), we started to notice the brakes pulsating at faster speeds. Typically around town you don't notice anything, but highway/interstate driving you will notice it. I decided to pull of the front tires and look at the brakes. I figured with the milage, the pads should be wearing out to their life span, but they actually looked decent. Still with "meat" on them. One pad has a ridge wearing in it, and that same rotor is showing the ridge too. That's not the concerning part...the other rotor appears to have a raised bump on it!  The picture make it look like a pimple! Very odd and strange! NOTE: These are the factory brakes and rotors.   I'm attaching pictures of the front brakes and what they look like ate ~69000 miles.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...