Super Cruise Stopped Working After Update

[Josh M, 2023 Sierra 1500]

The dealership recently installed 2 updates on my vehicle - GM N23-240012 and GM N22-2379480.  After picking my truck up, the Super Cruise no longer works.  It doesn't give me any details when I try to engage Super Cruise, only says "Super Cruise Unavailable".  This wasn't an issue before the updates.  Has anyone else experienced this and found a fix without having to drop it off at a dealership again?

[Kevin0311]

mine has stopped working for a day after the update then the next day was fine no issue, all other functions worked fine just the super cruise function. How long since you had update done?  I would give a day or so see if it comes back like mine did. 

[Josh M, 2023 Sierra 1500]

I gave it about a week and just dropped it off at the dealership this morning because it never started working again.  I'm also having new tires put on which are slightly larger than stock, and I'm wondering if that's going to make it bug out again (assuming they can even fix it in the first place).  Any chance you did the same and could offer some reassurance?

[66ss3964spd]

The larger tires shouldn't be an issue for SC to work, but they could throw off the speedo. If the new tires are about the same diameter as the originals the speedo will be close. If the new tires are a size that could have been installed as a factory option the truck can be reprogrammed for that size tire, but I've read not all dealers will do it.

 

Use a tire size calculator. Input the size that the truck came with and the size you want to use. The calculator will show you the difference in diameter and % difference. Tire Size Calculator

 

Forgot to add, installing larger diameter tires without reprogramming the computer may void your warranty. The speedo will be off as will be the odometer - basically under reporting how many miles have been driven.

Edited January 28, 2025 by Dan H 2023 HC

[tbarn]

#PIT3271P: Guidelines When Changing Tire And Wheel Size - (Jul 11, 2024)

Subject:

Guidelines When Changing Tire And Wheel Size

---

Brand:	Model:	Model Year:		VIN:		Engine:	Transmission:
		from	to	from	to
All*	All*	2003-2023		All	All	All	All

* Except Silverado Med Duty and LCF Models

Supersession Statement

This PI was superseded to update the Models. Please discard PIT3271M.

 

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

 

Condition / Concern

A request may be made for a variety of reasons to change the tire size on a vehicle. 

Recommendations / Instructions

General Motors will ONLY support a tire calibration for tires that have been sized, tested and designed for the vehicle in question and its applications.  The only way to confirm that a calibration is available would be to visit YOUR sales department. Using the sales order guide, if you can build a vehicle, using the same make, model year, trim, and meet any restrictions listed in the tire section, GM will have a corresponding calibration available. 

Note: When changing tire size for new vehicles prior to the first sale and/or a tire/wheel size that may require a different pressure or alter the cargo carrying capacity of the vehicle, refer to #12-00-89-007B: Dealer Responsibility for Cargo Carrying Capacity Labeling.  

Once the tire application has been confirmed per the sales guide, contact Techline Customer Support Center (TCSC) (English: 1-800-828-6860, French: 1-800-503-3222 ) to determine calibration availability. 

Please do not call Technical Assistance Center for these concerns.

Note: There may be a cost to the customer for this service. This is NOT a feature that is covered under the manufacturer's warranty.

Examples: 

First example -  A customer with a 2019 Chevrolet Silverado 1WT Regular Cab built with 255/70/R17 tires would like to install a set of wheels and tires from a 2019 Silverado 1CX Double Cab, which came with 275/60/R20 size tires.  Based on the order guide, the 1WT trim is only available with either 255/70R17 or 265/70R17 size tires. For this reason, a calibration will not be offered for this application.  

Second example - A customer with a 2018 Chevrolet Colorado 2LT Crew Cab built with 255/65/R17 size tires would like to install a set of wheels and tires from a 2019 Chevrolet Colorado Z71 with 265/65/R17 size tires.  From the order guide, the 2LT trim is only available with either 255/65/R17 or 265/60/R18 size tires. For this reason, a calibration will not be offered for this application either.   

 

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.