Getting stuck in 4wd?

[15 Z71]

So winter is right around the corner here in north east Ohio. I have a late built 15 Sierra and was wondering if they are still having problems if you turn truck off in four wheel hi. Sometimes I will leave it in hi when I get to work if its going to snow all day. Should I switch it back to 2 wheel before I turn it off? This was never a problem with my 06 Silverado.

[txchevy4ever]

If you've had the transfer case recall software patch, you don't have to worry about it.

[15 Z71]

If you've had the transfer case recall software patch, you don't have to worry about it.

I never had a transfer case recall. Should I check if I need that done?

[CptMcSaug]

If it was a late built 15 it probably came with it from the factory already.

 

This was a bulletin on some 14 year models

"

PIP5250: Service 4 Wheel Drive Message With DTCs C0398 Or C0326 Setting When Vehicle Operated Below 32 Degrees (0 C) - (Dec 22, 2014)

Subject: Service 4 Wheel Drive Message With DTCs C0398 Or C0326 Setting When Vehicle Operated Below 32 Degrees (0 C) Models: 2014 Chevrolet Silverado 1500 2015 Chevrolet Silverado 1500, Suburban Tahoe 2014 GMC Sierra 1500 2015 GMC Sierra 1500 Yukon Yukon XL 2015 Cadillac Escalade 4 Wheel drive equipped with RPO NQH or NPO

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

Condition/Concern

Some customers may comment on a Service 4WD message in the DIC. Technicians may find that the vehicle has a C0398 or C0326 stored in the Transfer Case Control Module.

Recommendation/Instructions

Ensure that the TCCM has the latest software/calibration files. DO NOT re-program with the existing software. Record the freeze frame records and clear the codes. Then operate the vehicle in all available transfer case positions.

If any diagnostic trouble codes reset then perform published diagnostics.

If no diagnostic trouble codes reset and if the vehicle is operated in areas where the ambient temperature is below 32 * F (0*C), then advise the customer that G.M. engineering is investigating this issue and this PI will be updated when a repair is available. Dealers with a technical assistance case will be sent a communication when a repair is available.

To prevent the condition from occurring while a fix is developed, please instruct the customers to perform the following

1. PRIOR to shutting ignition off select the 2wdr position on the transfer case shift control knob/switch.
2. Instruct customers to wait for the DIC "Shift In Progress" message to go away and 2wd shift indicator light in the switch to turn on solid. This will ensure that the transfer case is in the 2wd position when the vehicle is shut off.
3. Turn ignition switch OFF.

After startup and during normal driving conditions customers may use any transfer case modes.

Note: If the transfer case shift control switch is left in any other position (4Hi, Auto or 4Lo) during shut down these code(s) could be set. If this is the case, transfer case range selection will only be allowed when dtcs are cleared.

If the above procedure does not work please call technical assistance at the number you have been provided.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed."

[15 Z71]

Is July-16-2015 considered a late build date?

[TJay74]

Just have the dealer run you VIN thru GMVIS, it will tell them if you need the firmware update or not.

[thewhitestallion]

Is July-16-2015 considered a late build date?

 

Yes that is a very late build. They probably started building 2016's a few weeks after your truck was built.

[15 Z71]

Good,i hope most of the bugs and recalls were fixed. So far 14,000 trouble free miles.

[Imcrazy]

If the winter is like the last few you won't really need that 4wd much.... I've hardly used mine, that locking rear end is pretty awesome if you've got some good tires on the truck.