hosseface
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Off topic but are you changing your wheels? Didn't know what was up with the sig pic. The black wheels would look nice.
"Service 4WD" - Master Thread
- Thread starter SVL
- Start date
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Off topic but are you changing your wheels? Didn't know what was up with the sig pic. The black wheels would look nice.
Wife want those she will buy with own money,lol is OK with me will set the original 20" with snow tires for winter.
[emoji111]
dirt-diver
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Why no fix yet?
I find it really hard to believe GM hasn't found a fix yet. It's been months, and a major feature of their best selling line is still not working?
I find it really hard to believe GM hasn't found a fix yet. It's been months, and a major feature of their best selling line is still not working?
Just had the same problem today. Vehicle is a 2015 Yukon XL Denali, produced last week of August and delivered early September.
I have been driving the vehicle mostly in 2WD mode in dry weather conditions. Recently with fall rains in the Midwest, I switched to Auto mode. I have been driving in Auto mode for about a week without noticeable difference and without problem....until this morning.
I drove all morning in Auto mode, making several stops. Conditions were a light drizzle/rain. After my last stop, I started the ignition and backed out of my parking space. It felt like the parking brake was applied, but it was not. (I never use the parking brake). Within seconds, the Service 4WD light came on. From that point forward, it was clear the transmission was stuck in 4WD mode....reduced turning radius, rubbing/grinding noise and increased friction in transmission causing the vehicle to stop when coasting in idle.
I immediately called my local dealer. They got me right in. They have not seen many 2015 models come through service yet and have not seen this issue at all yet. I showed them the info from this forum. They performed the Transmission module reprogramming and the issue was resolved. Seems like a "glitch" similar to when your home computer needs to be restarted - or a program needs to be reloaded.
They said there is not a recall for my vehicle or a known bulletin about this exact issue. The previously mentioned bulletin in this thread was from July and pertained to transmission going into "neutral" spontaneously. However, the same "fix" applied.
Hopefully, GMC will take notice and find a permanent solution. For now, I'm going to stay in 2WD and switch to 4WD High manually when needed.
I have been driving the vehicle mostly in 2WD mode in dry weather conditions. Recently with fall rains in the Midwest, I switched to Auto mode. I have been driving in Auto mode for about a week without noticeable difference and without problem....until this morning.
I drove all morning in Auto mode, making several stops. Conditions were a light drizzle/rain. After my last stop, I started the ignition and backed out of my parking space. It felt like the parking brake was applied, but it was not. (I never use the parking brake). Within seconds, the Service 4WD light came on. From that point forward, it was clear the transmission was stuck in 4WD mode....reduced turning radius, rubbing/grinding noise and increased friction in transmission causing the vehicle to stop when coasting in idle.
I immediately called my local dealer. They got me right in. They have not seen many 2015 models come through service yet and have not seen this issue at all yet. I showed them the info from this forum. They performed the Transmission module reprogramming and the issue was resolved. Seems like a "glitch" similar to when your home computer needs to be restarted - or a program needs to be reloaded.
They said there is not a recall for my vehicle or a known bulletin about this exact issue. The previously mentioned bulletin in this thread was from July and pertained to transmission going into "neutral" spontaneously. However, the same "fix" applied.
Hopefully, GMC will take notice and find a permanent solution. For now, I'm going to stay in 2WD and switch to 4WD High manually when needed.
JayBanks9
Member
My wife backed out of the driveway yesterday and service 4 wd message appeared. She called and thought the parking brake was on. We've had ours in 2wd the entire time. Anyone else had it with just using 2wd? Bought the car out of state and called a local dealer who said they havent heard of the issue in the new models. Should I avoid them for repairs or just tell them to reflash the transfer case? This is crazy to still have this issue
I have the last update yesterday they do for me, I just bring for regular service and they update with the latest version.
Hope work now.
JayBanks9
Member
Dealer reprogrammed the trahsfer case and its back to normal. Fingers crossed it isnt a reoccuring thing.
Mountaingirl45
TYF Newbie
Round 2 of "Service 4WD"
Well it happened again. We had a cold snap with some snow so I put it in "Auto" for safety reasons. Low and behold it happened again stuck in 4WD the next day. Took it back to the dealership, they "said" they tested the range sensor and it passed. They still couldn't get it out of 4WD so they had to call the manufacture. Turned out they had to "replace" the encoder motor. Was told by one of the service reps to "never" leave it in "Auto" leave it in 2WD until you need it.
If you read in the manual section 9-38 no where in that manual does is say not to leave it on "Auto". It did say you would get better mileage then 2 wheel drive. I reminded them that Arizona has a lemon law and if they can't fix it I will be happy to go that route. Hopefully I won't have to because I love my Tahoe.
Well it happened again. We had a cold snap with some snow so I put it in "Auto" for safety reasons. Low and behold it happened again stuck in 4WD the next day. Took it back to the dealership, they "said" they tested the range sensor and it passed. They still couldn't get it out of 4WD so they had to call the manufacture. Turned out they had to "replace" the encoder motor. Was told by one of the service reps to "never" leave it in "Auto" leave it in 2WD until you need it.
If you read in the manual section 9-38 no where in that manual does is say not to leave it on "Auto". It did say you would get better mileage then 2 wheel drive. I reminded them that Arizona has a lemon law and if they can't fix it I will be happy to go that route. Hopefully I won't have to because I love my Tahoe.
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It snows in Arizona? 
I seriously didn't know it did that in AZ
I seriously didn't know it did that in AZ Lest bust they ass everyone keep on 4wd , this is a hazardous situation now.Well it happened again. We had a cold snap with some snow so I put it in "Auto" for safety reasons. Low and behold it happened again stuck in 4WD the next day. Took it back to the dealership, they "said" they tested the range sensor and it passed. They still couldn't get it out of 4WD so they had to call the manufacture. Turned out they had to "replace" the encoder motor. Was told by one of the service reps to "never" leave it in "Auto" leave it in 2WD until you need it.
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They have to fix by now.
ralphtt
TYF Newbie
Well it happened again. We had a cold snap with some snow so I put it in "Auto" for safety reasons. Low and behold it happened again stuck in 4WD the next day. Took it back to the dealership, they "said" they tested the range sensor and it passed. They still couldn't get it out of 4WD so they had to call the manufacture. Turned out they had to "replace" the encoder motor. Was told by one of the service reps to "never" leave it in "Auto" leave it in 2WD until you need it.
I'm late to the party but I have been through this situation three times now. (Four counting the recall to reprogram the transfer case). Finally decided to contact GM customer service back on October 25 and so far all I get is lip service. They did have the dealer call me to schedule an appointment to 'check everything out'.
Neither Chevrolet or the dealer seem to realize that owning a vehicle this unreliable is unsatisfactory. Fact is, you can never be sure you will return home without the transfer case locking up. I have been reluctant to make a long trip due to this problem . . . would hate to be several hundred miles from home and have to contact a new dealer to get the vehicle out of 4 WD.
I plan to hold their feet to the fire on this one . . . and if necessary the lemon law is in our corner. Sure would hate to go that route, 'cause like Mountaingirl, I like the Tahoe~
Second time in the dealership with transfer case issues on 2015 Yukon
First visit was due to transmission slipping into neutral going down the highway. Could not get it back into gear. Dealership said there was a bulletin and they reprogrammed and replaced module.
Today the "Service 4WD" light came on and the transfer case was stuck in 4L. I've never used 4WD Low. I used Auto last night and must have turned the engine off without going back to 2WD.
Tow truck driver said he brings in a dozen or so 2015's a week for the same set of issues. More now that we've had snow. Can't wait to see what happens with everyone starts to use their trucks with 4WD this winter. Being told to return the vehicle to 2WD before shutting off is insane. GM needs to figure this out.
First visit was due to transmission slipping into neutral going down the highway. Could not get it back into gear. Dealership said there was a bulletin and they reprogrammed and replaced module.
Today the "Service 4WD" light came on and the transfer case was stuck in 4L. I've never used 4WD Low. I used Auto last night and must have turned the engine off without going back to 2WD.
Tow truck driver said he brings in a dozen or so 2015's a week for the same set of issues. More now that we've had snow. Can't wait to see what happens with everyone starts to use their trucks with 4WD this winter. Being told to return the vehicle to 2WD before shutting off is insane. GM needs to figure this out.
They must fixed or we have to return the truck to the dealer up yo they figure out.
I use my Denali in auto I don't care if break again I just need one more time before I live in the dealer for good.
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8 speed report- Did a lot of driving this weekend on totally covered snow and ice roads. Used Auto and 4 hi. Turned on and off several times while in 4 auto and 4 hi without any issues. Everything worked as it should. Hopefully this is not an issues with this configuration.
Enjoy because everyone with 2015-2 ,6 speed discontinued vehicles will crying later including me.
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Thanks for updating us! I'm going to wait to pass judgment until we've got a few more reports from 2015i owners (after all, not all the 6 speed equipped units are having problems) but I'm hopeful that GM has remedied the problem.
Yeah, my truck is in the state but I'm being told I should get it next week by the time it gets unloaded from the train and trucked down to the dealership.
Cool you must have plenty snow already.
New recall?
Dealership called and said my '15 Yukon XL was fixed (again). Adviser said there is a brand new recall for the transfer case and they applied the new programing. She mention getting a recall card in the next few week. We'll see if the reprogramming makes a difference or not. I'm going to park it in Auto tonight and see if it allows me to get back into 2WD.
Dealership called and said my '15 Yukon XL was fixed (again). Adviser said there is a brand new recall for the transfer case and they applied the new programing. She mention getting a recall card in the next few week. We'll see if the reprogramming makes a difference or not. I'm going to park it in Auto tonight and see if it allows me to get back into 2WD.
