Hey everyone I’m new to the forums and I’ve been battling this issue with my truck for a few months now. I have a 2014 GMC Sierra 1500 Denali. Every time I start up my truck, the “service 4wd” indicator will come on and won’t allow me to go into 4 high or 4 low. Doesn’t seem like the truck is stuck in 4wd or anything. The transfer case seems to be working properly and everything because sometimes I’ll get lucky and will be able to shift into 4wd before the indicator comes on (sometimes it won’t come on right when I start the truck). I’ve done some research and as everyone knows, once electrical problems begin, they suck to chase. A code that i pulled off the computer is p2771 4WD low switch circuit. I just watched a video with someone having the same issue and they cleaned the ground connection right underneath the driver side door that grounds to the cab mount and that seemed to fix the issue for them. I have not tried doing that yet, so that may be my next move. If anyone has any information on that, it’d be very helpful! The other issue I’m running into that seems to be more severe is the stabilitrak and traction control randomly turning itself off simultaneously. This is causing the truck to go into limp mode and cutting the engines power and changing the shift points. It will do this on and off and I’m at a loss as to what it could be. Any tips would help!
Welder603
You have a circuit code. Either a wiring, module, switch or sensor problem. The range sensors on the encoders tend to fail. It wouldn’t hurt to unplug and check connectors for moisture intrusion and corroded terminals.
Do you have any engine performance codes? Most codes will disable stabilitrak
Do you have any engine performance codes? Most codes will disable stabilitrak
i dont have a lot of advice for you other than that i know that very strange things can happen with bad grounds
I've been having this issue in my 2014 Silverado for about a year. Cannot figure it out. Changed encoder motor, cleaned up grounds. replaced switches. I'm at a loss. And of course all this happens after it's paid off.
Still have this issue. I changed all wheel sensors and now have stabilitrak come in right away and still have 4wd service issues
I also just started getting weird speed fluctuations where if I let my foot off the accelerator it shows a vastly lower mph. Example I'm driving 55mph and it shows I'm driving 23mph. I changed both front hubs.
Replaced the Position switch sensor. No luck. It def gets worse when it's cold temperatures. TCCM has been programmed with software update prior.
Any luck guys. My 2012 gmc 2500 started doing the same. At first it would move to 4x4 low and high but it would take awhile. Then i took it to the island and got stuck. Put it on 4x4 high but only back tires would move even though the light was on 4x4 high. I replace front actuator a couple years ago and when i took off transfer case actuator the 2wd light didnt light up at all and i got all 3 messages. service 4x4 service stabilitrack service traction control. I replaced the transfer case actuator but it did nothing. i cleaned ground wires as well and nothing.
I am also having these issues but found out the hard way...I was merging into the hwy doing maybe 35-40 mph because it was snowing a whole lot, while I was getting on to the hwy the four wheel drive just decided to turn off and my rear end kicked out so I ended up into a guardrail. Anyone have any luck fixing this?
Hey I have a 2015 Chevy 3500 Duramax and It is now doing the same thing. What did you do to fix it or is it still giving you issues
I don't know about everyone else with their causes on this issue but after further inspection mine turned out to be a severed wire that had been causing it.
We've got a bunch of chipmunks around our house and I caught one of them jumping out from the wheel well one day and I knew exactly what he had been up to
.
A couple butt connectors and electrical tape fixed it and then I wrapoed the entire wiring harness in aluminum coated furnace tape as those chipmunks don't want anything to do with biting through metal.
Took the vehicle up to a local Jiffy Lube and they reset the computer.. check engine and traction control lights went out.
Haven't had any issues since I've done this
We've got a bunch of chipmunks around our house and I caught one of them jumping out from the wheel well one day and I knew exactly what he had been up to
.A couple butt connectors and electrical tape fixed it and then I wrapoed the entire wiring harness in aluminum coated furnace tape as those chipmunks don't want anything to do with biting through metal.
Took the vehicle up to a local Jiffy Lube and they reset the computer.. check engine and traction control lights went out.
Haven't had any issues since I've done this
Chipmunks are a menace. They can actually damage the foundation of a house. I've killed about 170 around my house in the last year.
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