New 2016 Stuck in 4WD, help!

[DiverRick]

5 month old 2016 with 3300 miles, pulling a 5500lb camper up to the camp site yesterday, got the "Service 4WD" on the dash. The selector knob was in "Auto" and the truck proceeded to lock itself in to 4WD. Got to the camp site with a lot of hopping and screeching, Pulled battery overnight but she's still stuck. No light on selector knob unless it's in Auto.

 

We are 150 miles from home and on a week long vacation pulling this camper around.

 

I read up a bit and figured I would either pull the actuator and manually shift the tcase into 2hi, or pull the front driveshaft.

 

Got up early this morning. Decided to try the actuator first. But as I loosened the bolts and started to wiggle it out, I noticed that there is some kind of rotational spring pressure on it, as well as some oii started dripping, so for those 2 reasons I bolted it back up.

 

Moved to the front driveshaft. Got it disconnected from the front yoke, but the rear is held to the tcase with a sealed on boot, crimped on with metal rings. Didnt want to destroy that so I bolted the driveshaft back up.

 

Is there any other way to manually disengage the front axle just for the week until I can get back home and have the dealer check it out?

 

Help!!!!!!!!!!

 

Thanks.

 

 

Had the exact same thing happen.

 

All I had to do was pull the 4x4 fuse until I got into the dealer the next day. System went into 2x by default without the fuse in.

 

New fuse and no problems since.

[TwoBallScrewBall]

The truck is a 2016. I honestly didn't realize it was in Auto. I will definitely make sure to leave it in 2Hi because I know Auto leaves the Tcase in 4WD and just disengages the front clutches.

 

I pulled the 30A J-Case fuse in position 6 under the hood, was labeled 4WD something or other, not the TCM. I think it's the line that must enegrize the coil on the AWD clutches. With this fuse pulled, I still am in AWD on the dash and I still get the "Service 4WD" message as well as "Service Stabilitrak" now, but the front axle is free.

 

Thanks all

 

 

[jamesonjc]

auto does not disengage the front clutches.

JC

[White mountain traveler]

This happened to me today and after hours of trying different procedures with no luck I finally got the truck out of 4wd auto. I first put it in neutral applied the parking brake and kept the ignition in the run position. Then I pulled the fuse under the hood #6 marked 4wd trec, it was a 30amp square fuse and then reinstalled it. The truck seems to work correctly now and will never forget to make sure it's in the 2wd position when I turn it off. Hope this helps others

[gigegig]

I had similar problems, changed these items in this order with no help. Shift motor, diff actuator, switch on dash. My son had been driving thru slush and puddles(for awhile). I disconnected the shift motor plug and receptacle, one pin was corroded from water intrusion. I made my own harness from salvaged connectors because they cost WAYYYY too

much ANYWHERE else. Problem fixed, When you slice new harness, make sure 100% it is sealed from the environment. I used commercial aircraft grade environmental splices, works like a champ, just takes some patience. Good luck.....

[phabejhmoob]

I had the same problem at 700 miles took it to the dealer turned out it was a bad acuator they changed it and fixed the problem. Wasn't charged because it was part of the warranty

 

Sent from my VS990 using Tapatalk

 

same thing with my 2016. Bad actuator, have it replaced under warranty.

[hilhp350]

I just had the same issue happen to my wife's 2016 suburban on the tail end of getting back home from a 4 hour highway trip. I tried reverse, switching to 4wd in neutral, etc but nothing worked. Only 16k miles so drove it to the dealer for repair.

 

Reading this board this sounds like a common issue. Wonder if a recall is in order to get them all fixed?

[Thomcat]

I had similar problems, changed these items in this order with no help. Shift motor, diff actuator, switch on dash. My son had been driving thru slush and puddles(for awhile). I disconnected the shift motor plug and receptacle, one pin was corroded from water intrusion. I made my own harness from salvaged connectors because they cost WAYYYY too

much ANYWHERE else. Problem fixed, When you slice new harness, make sure 100% it is sealed from the environment. I used commercial aircraft grade environmental splices, works like a champ, just takes some patience. Good luck.....

Re: corroded pin in the connector. There's an article addressing this issue posted on missing water seals in the transfer case connector on 15-17 trucks, suggests replacement of the shift motor in addition to the harness. Might be a good idea to check it out next time under the truck

 

http://sandyblogs.com/techlink/wp-content/uploads/2017/05/GM_TechLink_06_Mid-March_2017.pdf

[FU Motorsports]

OJ Simpson, I damn near pissed myself when you mentioned driving backwards with the turnsignal and wiper on. I appreciate your humor. I always thought you werent guilty too.

[Thomcat]

A '16 stuck in 4WD with DTC C0398?....not surprising.......seems there is a problem with the transfer module software in 15s and 16s Silverados and Sierras and the fix is to update the software or replace and program a new module if old one cannot be properly programmed. Dealer's have been (not a recall or TSB but something called a TAG #N152028770, 1/17 .) notified to examine and make changes if necessary to vehicles brought in for routine maintenance. So it appears if you don't go to the dealer or the dealer is unaware, your SOL if it screws up after warranty. My dealer corrected it as the only item for the appointment even though it hadn't screwed up yet and updated the software which it did need to prevent a future screw up.

 

Lost the website page but copied the info:

 

gm.oemdtc.com GM Advanced Automotive Diagnostics

• Recalls
• Diagnostic Tips
• Repair Tips
• Links
• E-Books
• Store
• oemdtc

Tag: C0398 28770: Service Update – 4WD IPS Drift DTC C0398 – 4HI Lock-Up – 2015-2016 Cadillac Chevrolet GMC

#28770: Service Update – 4WD IPS Drift DTC C0398 – 4HI Lock-Up – (Jan 6, 2017)

Subject: 4WD IPS Drift DTC C0398 – 4HI Lock-Up Models: 2016 Cadillac Escalade, Escalade ESV 2016–2015 Chevrolet Silverado LD 2016 Chevrolet Suburban 2016 Chevrolet Tahoe 2016–2015 GMC Sierra LD 2016 GMC Yukon, Yukon XL Reference Number: N152028770 Release Date: January 2017 Revision: 00 Attention: This service update includes vehicles in dealer inventory and customer vehicles that return to the dealership for any reason. This bulletin will expire at the end of the involved vehicle’s New Vehicle Limited Warranty period. Make Model Model Year RPO Description From To Cadillac Escalade / Escalade ESV 2016 2016 NQH Transfer Case Chevrolet Silverado LD 2015 2016 NQH Transfer Case Chevrolet Suburban 2016 2016 NP0/NQH Transfer Case Chevrolet Tahoe 2016 2016 NP0/NQH Transfer Case GMC Sierra LD 2015 2016 NQH Transfer Case GMC Yukon / Yukon XL 2016 2016 NP0/NQH Transfer Case

Note: Some Export models of the Cadillac Escalade may be equipped with transfer case RPO NP0.

Please confirm vehicle content and appropriately build the vehicle in GDS before reprogramming.

Involved vehicles are marked “open” on the Investigate Vehicle History screen in GM Global Warranty Management system. This site should always be checked to confirm vehicle involvement prior to beginning any required inspections and/or repairs.

Condition A “Service 4WD” message may be displayed on the Driver Information Center and DTC C0398 may be set. Concurrently, the vehicle is permanently locked in 4HI and cannot be shifted shift out of it while the code is present. If the code is cleared, this scenario may repeat if the transfer case is in “Auto” mode and driven for approx. 2 or more hours. Customers will likely notice that the steering wheel is harder to turn, the engine will feel like it has lost power and the tires may squeal when turning in a parking lot. Correction Dealers are to reprogram the Transfer Case Control Module.

Service 4WD Message C0398 – 2014-2016 Cadillac Chevrolet & GMC

Subject: Service 4wd Message C0398 Models: 2014-2016 Chevrolet Silverado 2015-2016 Chevrolet Suburban Tahoe 2014-2016 GMC Sierra 2015-2016 GMC Yukon 2015-2016 Cadillac Escalade 2015-2016 GMC Canyon 2016 Chevrolet Colorado

 

Condition/Concern

Some customers may comment on a “Service 4wd” message displayed in the DIC. Upon investigation dealer may notice a C0398 in the tccm along with a U0403 and U0102 in various other modules.

Clearing C0398 from Transfer Case Control Module – 2014-2016 Cadillac Chevrolet GMC

Subject: Clearing C0398 from Transfer Case Control Module Models: 2014-2016 Chevrolet Silverado 2015-2016 Chevrolet Suburban Tahoe 2014-2016 GMC Sierra 2015-2016 GMC Yukon 2015-2016 Cadillac Escalade 2016 Chevrolet Colorado 2015-2016 GMC Canyon Equipped with NP0, NQH or NQ6 transfer case

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

 

Condition/Concern

Dealers may notice that C0398 will not clear from the TCCM when attempting to clear with GDS on the first attempt. When his happens some dealers are replacing the TCCM or reprogramming the TCCM, often with the same software.

(more…)

4WD Always Engaged in Cold Ambient Temperatures / Service 4WD Message Displayed, DTC C0398 Stored – 2014-2015 Cadillac Chevrolet GMC

Subject: 15304 – 4WD Always Engaged in Cold Ambient Temperatures / Service 4WD Message Displayed, DTC C0398 Stored Models: 2015 Cadillac Escalade, Escalade ESV 2014-2015 Chevrolet Silverado 2015 Chevrolet Suburban, Tahoe 2014-2015 GMC Sierra 2015 GMC Canyon, Yukon, Yukon XL Equipped with 4WD Transfer Case (NQH, NPO or NQ6)

 

Service procedure to reprogram the transfer case control module on the vehicles listed above.

In low ambient temperatures, below 5°F (-15°C) a transfer case brake motor assembly malfunction may occur.

Diagnostic Trouble Code (C0398 – Range Position Correlation Fault) will be set, locking the transfer case in “4HI” until the vehicle is serviced.

This software update also addresses other transfer case control issues for overall improved drivability.

 

Search

Search for:

 

• Recalls
• Diagnostic Tips
• Repair Tips
• Links
• E-Books
• Store
• oemdtc

4WD Always Engaged in Cold Ambient Temperatures / Service 4WD Message Displayed, DTC C0398 Stored – 2014-2015 Cadillac Chevrolet GMC

oemdtc February 14, 2016Service Update

Subject: 15304 – 4WD Always Engaged in Cold Ambient Temperatures / Service 4WD Message Displayed, DTC C0398 Stored Models: 2015 Cadillac Escalade, Escalade ESV 2014-2015 Chevrolet Silverado 2015 Chevrolet Suburban, Tahoe 2014-2015 GMC Sierra 2015 GMC Canyon, Yukon, Yukon XL Equipped with 4WD Transfer Case (NQH, NPO or NQ6)

 

Service procedure to reprogram the transfer case control module on the vehicles listed above.

In low ambient temperatures, below 5°F (-15°C) a transfer case brake motor assembly malfunction may occur.

Diagnostic Trouble Code (C0398 – Range Position Correlation Fault) will be set, locking the transfer case in “4HI” until the vehicle is serviced.

This software update also addresses other transfer case control issues for overall improved drivability.

 

 

Parts Information

No parts are required for this repair

 

Service Procedure

Note: Carefully read and follow the instructions below.

• DO NOT attempt to order the calibration number from GM Customer Care and Aftersales. The calibration numbers required for this service procedure are programmed into control modules via a Multiple Diagnostic Interface (MDI) with the calibration update. If you cannot access the calibration, call the Techline Customer Support Center and it will be provided.
• DO NOT program a control module unless directed to by a service procedure or a service bulletin. If the control module is not properly configured with the correct calibration software, the control module will not control all of the vehicle features properly.
• Ensure the programming tool is equipped with the latest software and is securely connected to the data link connector. If there is an interruption during programming, programming failure or control module damage may occur.
• Stable battery voltage is critical during programming. Any fluctuation, spiking, over voltage or loss of voltage will interrupt programming. When required install the EL-49642 SPS Programming Support Tool to maintain system voltage. If not available, connect a fully charged 12 V jumper or booster pack disconnected from the AC voltage supply. DO NOT connect a battery charger.
• Turn OFF or disable systems that may put a load on the vehicles battery such as; interior lights, exterior lights (including daytime running lights), HVAC, radio, etc.
• During the programming procedure, follow the SPS prompts for the correct ignition switch position.
• Clear DTCs after programming is complete. Clearing powertrain DTCs will set the Inspection/Maintenance (I/M) system status indicators to NO.
• For reference, the Range/Mode switch on the instrument panel of vehicles equipped with an NQH (2014-2015 Chevrolet Silverado/GMC Sierra) transfer case have 5 positions for the switch (2HI / AUTO / 4HI / 4LO /Neutral). Only vehicles with an NQH transfer case have all 5 switch positions.
• Refer to Transfer Case Shift Control Module Programming and Setup (NQH) for additional information on programming the transfer case shift control module.

1. Install EL-49642 SPS programming support tool.
2. Access the Service Programming System (SPS) and follow the on-screen instructions.
3. On the SPS Supported Controllers screen, select K69 Transfer Case Control Module – Programming and follow the on-screen instructions.

Caution: After programming the transfer case module, it is essential that the transfer case setup procedure in step 4 is performed to ensure proper transfer case operation.

4. On the SPS Supported Controllers screen, select K69 Transfer Case Control Module – Setup and follow the on-screen instructions.
5. At the end of programming, choose the “Clear All DTCs” function on the SPS screen.

 

 

Approved J2534 Device with TIS2WEB can reprogram 1996 and later All GM Modules.

To obtain the latest electronic controller calibration information for your vehicle, go to https://tis2web.service.gm.com/tis2web and enter the vehicle’s 17 character Vehicle Identification Number (VIN) and select ‘Get CAL ID’.

You can then compare the latest part number with the actual number installed on the vehicle to determine if a reprogram is needed.

The Service Programming System (SPS) application is part of the TIS2Web system. To program an ECU, the SPS application must communicate with the vehicle control modules using the proper J2534 programming interface tool.

The following are the supported interface tools:

• Tech 2
• MDI
• J2534 Programming Interface Tool

The Tech 2 supports model years 1996 and beyond. With the addition of the CAN Diagnostic Interface (CANdi) module, Tech 2 is fully backward compatible with current Tech 2 functionality and operates transparently when diagnosing non-CAN-equipped vehicles.

Servicing the next generation Global A vehicles will require the diagnostic software, GDS2, Global Diagnostic System 2 running on a local PC device while the MDI is connected to the vehicle.

The GM MDI is the Global Diagnostic tool for future vehicles starting with Global A vehicles. The GM MDI was introduced in the fall of 2007 for Pass-Thru programming and offers faster programming speed. It can be used to perform Pass-Thru programming on all vehicles built since 1996 and into the future. Click here to view a list of GDS supported vehicles.

www.acdelcotds.com

[redwngr]

5 month old 2016 with 3300 miles, pulling a 5500lb camper up to the camp site yesterday, got the "Service 4WD" on the dash. The selector knob was in "Auto" and the truck proceeded to lock itself in to 4WD. Got to the camp site with a lot of hopping and screeching, Pulled battery overnight but she's still stuck. No light on selector knob unless it's in Auto.

 

We are 150 miles from home and on a week long vacation pulling this camper around.

 

I read up a bit and figured I would either pull the actuator and manually shift the tcase into 2hi, or pull the front driveshaft.

 

Got up early this morning. Decided to try the actuator first. But as I loosened the bolts and started to wiggle it out, I noticed that there is some kind of rotational spring pressure on it, as well as some oii started dripping, so for those 2 reasons I bolted it back up.

 

Moved to the front driveshaft. Got it disconnected from the front yoke, but the rear is held to the tcase with a sealed on boot, crimped on with metal rings. Didnt want to destroy that so I bolted the driveshaft back up.

 

Is there any other way to manually disengage the front axle just for the week until I can get back home and have the dealer check it out?

 

Help!!!!!!!!!!

 

Thanks.

 

I didn't read the rest of the thread, but take it in.

 

There is a recall.

 

Just had mine done.

 

Dealer advised of recall, I did not get paperwork from GM.

Edited July 23, 2017 by redwngr

[Bowtie Billy Hill]

That's the only problem I ever had with my '14 the whole time I had it. Service 4wd message came on, and it wouldn't shift out of 2wd no matter where the knob was turned. At least I was stuck in 2wd. Could've been worse. Seems to be fairly common, though. I had the exact same problem years ago with my '03 ZR2 Blazer.

[TwoBallScrewBall]

On 8/30/2016 at 8:40 PM, jamesonjc said:

auto does not disengage the front clutches.

JC

Old post I know, but then how does the front axle engage and disengage quickly when in Auto (AWD)?   I know in Auto, the transfer case is in 4wd (i can hear it shift) but when there is not a traction issue, there is no power to the front wheels.   If not the clutches in the front axle, then how does it work?  

 

 

[drowndafool]

DON'T SHIFT THE TRANSFER CASE UNLESS THE TRUCK IS ON!!!!

 

 I put the truck in 4wd and didn't switch it out before turning off the ignition. I shut the truck off and then I turned the knob to 2hi.

 

 The next time I started the truck it displayed a message to service 4wd and it wouldn't come out of 4hi.

 

 I had to disconnect the battery, wait 5 minutes and while waiting I pulled the fuse for the TCM (Transfer Case module). I didn't put the fuse back in until after reconnecting the battery and turning the key forward. After putting the fuse back in (with the key on) the truck shifted out of 4 wheel. Hope this helps...

[Jaycreek7908]

On 2/5/2019 at 6:10 PM, drowndafool said:

DON'T SHIFT THE TRANSFER CASE UNLESS THE TRUCK IS ON!!!!

 

 I put the truck in 4wd and didn't switch it out before turning off the ignition. I shut the truck off and then I turned the knob to 2hi.

 

 The next time I started the truck it displayed a message to service 4wd and it wouldn't come out of 4hi.

 

 I had to disconnect the battery, wait 5 minutes and while waiting I pulled the fuse for the TCM (Transfer Case module). I didn't put the fuse back in until after reconnecting the battery and turning the key forward. After putting the fuse back in (with the key on) the truck shifted out of 4 wheel. Hope this helps...

I thought for a second your method had saved me. When I plugged the fuse back in as per your method, I could hear the solenoid retract(at least that's what it sounded like). However, went to take it for a drive....nah, still got 4wd engaged ?