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Service 4WD

ShotgunZ71

By ShotgunZ71
in Troubleshooting & Recalls

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ShotgunZ71 Senior Enthusiast

ShotgunZ71

Posted
Posted

Got in the truck Sunday to go to church, and got the "Service 4WD" message in the DIC. It's in 2WD and the indicator light just goes off if in any position besides 2WD. I've used 4HI and 4LO a few times in the past and never had any issues. Did a quick search but the results were either for older 2500's or for 1500s. Didn't know if anyone up here has had this happen yet on the 2015+ 2500HD trucks. I do plan on taking it in soon and getting looked at.



I have it scheduled to be looked at next week. Any ideas would be welcome, though.



Sledge8 Enthusiast

Sledge8

Posted
Posted

My old 04 2500Hd used to do this from time to time. I would guess 4-6 times in 12 years. I would shut the truck off and on restart the message would be gone and all worked as designed.

Once in a while I would also get the heater come on when it was 90 outside. Same thing, shut it off and restart all good back to AC. Haven't seen either on the new truck yet...

 

Damn Computers....

  • Like 1
magnum74 Enthusiast

magnum74

Posted
Posted

There was a TSB with something to this effect on the 1500's but not sure about the HD's. Sounds like the same problem, though. It was a switch/sensor issue and not an actual mechanical problem.

ShotgunZ71 Senior Enthusiast

ShotgunZ71

Posted
  • Author
Posted

Hope to hear something late tomorrow afternoon or Wednesday morning. I'll be sure to share their findings.

 

 

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ShotgunZ71 Senior Enthusiast

ShotgunZ71

Posted
  • Author
Posted

They told me they had to order a new actuator. It should be in tomorrow.

 

 

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ShotgunZ71 Senior Enthusiast

ShotgunZ71

Posted
  • Author
Posted

Update: The 4WD Actuator was order Wednesday afternoon and was still in transit with FedEx yesterday. Hopefully it will arrive Monday and I will be able to get the truck early in the week.

ShotgunZ71 Senior Enthusiast

ShotgunZ71

Posted
  • Author
Posted

Still under warranty? Hopefully this will fix the situation.

Yes, it's still under the B2B 3/36 warranty. At least for another year or 11k miles.

  • Like 1
ShotgunZ71 Senior Enthusiast

ShotgunZ71

Posted
  • Author
Posted

So, the service rep misspoke about the particular part ordered. No biggie. They had to order a new module for it. That came in and they went to program it, but after last evening and this morning, said that it wouldn't take the program. They are sending the "new" one back and having another new module overnighted to the dealer. I have the truck back now with the "Service 4WD" message and now a "Service Stabilitrak" message, as I had to have it for the next few days. They will call me when the module gets there and we will schedule an appointment to get it installed and programmed. Started to get a bit agitated, but realized that it's out of their control as far as a bad component is concerned. I truly hope that the new module comes in and can be installed and programmed correctly the first time.

ShotgunZ71 Senior Enthusiast

ShotgunZ71

Posted
  • Author
Posted

Finally got my truck fixed. I had to take it back to them once the part came in, as it was no need for it to stay there when I could use it. As it turns out, the problem was cause by a corroded wire coming from the module. Apparently a rodent or other vermin nibbled at the insulation, possibly before I even bought the truck, and the wire finally corroded enough to break the circuit. All was repaired and it's driving like new.

 

Side note, a friend of mine was telling the story of test driving a new truck, and when they opened the hood they found that something had been having a field day with the under-hood insulation.

  • Like 1
  • 2 months later...
Ian Pritchard (Hydroguy8) Enthusiast

Ian Pritchard (Hydroguy8)

Posted
Posted (edited)

Had that warning on for 11 years on my '06 Silverado. Into the dealer at least 4 times-said corroded ground wire. Never did get it fixed long term. Waranty was up quick with my mileage at that time. Warning is still on, but truck still performs as it should, but is slow to engage 4WD and must shut off truck to disengage 4WDwhen it's in the Autotrack mode. 

 

My 2015 is good and my 2017 HD is good too, fingers crossed!!

 

Edited by Ian Pritchard (Hydroguy8)
  • 2 years later...
dpbetts3 New Member

dpbetts3

Posted
Posted

I also have the same issue." Service 4WD" for  new 2019 GMC sierra  truck .

Comes on  intermittently .

Went into dealer  approx. 3 weeks ago.

Told me they had to order a new actuator.( was not moving when  4WD selected)

None in stock.

Dealer said GMC has to make  a new one?

Still waiting.

  • 2 weeks later...
  • 3 weeks later...
Ct1022 New Member

Ct1022

Posted
Posted

2019 2500 hd service 4wd dealer replaced the actuator transfer case module transfer case wire harness and the fuse block still getting the service 4wd light intermittently 

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