OEM Cruise Control Addition on GM vehicles

David Owner Metter, Georgia Posted   Latest   Edited  
Case Study
Electrical
Programming
2017 GMC Savana 2500 6.0L (G L96) 8-spd (8L90)
Procedure For Adding Cruise Control Operation On Gm Vehicles That Are Manufactured Without Cruise Control
Contact Ac Delco Techline For Software Changes To Enable Cruise Control
Replace Steering Wheel Assembly With Cruise Control Buttons Installed On Steering Wheel
Tsb: Pit4844g

2017 GMC Savanna 3500 6.0L VIN: 1GD37TCG1H1159114

You may be aware that some of the GM trucks and vans with the lower trim level packages do not come with cruise control installed from factory. The reason for this post is to outline the procedure that GM has provided to install the factory cruise control to these vehicles that are listed in TSB: PIT4844G

Step 1 

Contact GM AC Delco aftermarket support line and check if your VIN number is eligible for the cruise control upgrade. If you are an aftermarket shop do not call the Techline number listed in the TSB. This is for Dealers only. Rather call the Aftermarket AC Delco support center at … and select option 2. The reason for calling them is to get them to modify the BCM and the ECM/PCM software on their servers to enable the cruise control operation. They used to charge $50 for this software change as the TSB states. The last time I did it they said that they will now charge $120 due to changes on their end. Some vehicle models only need the BCM software changed and others need both BCM and ECM/PCM software changed.

Step 2

Fax a Repair Order to the AC Delco support center (Typed - Not hand written) showing that you have ordered the three items listed in the TSB - Steering wheel with cruise switches, SIR coil, and steering column wiring harness. Once they have received the Repair Order they will modify the software for the appropriate modules of the vehicle on their end and will inform you which modules they did and which modules will require a software update. One time they were asking for an authorization code for this cruise upgrade that they said should have come with the parts from the dealer. After striking out with that support representative about the authorization code I called back and got another representative that was more helpful and pushed the process through very easily.

Note that since your VIN is not built with cruise control, you will need to order parts for an identical vehicle with cruise which the K34 RPO code designates. The GM vehicles that I have added cruise to never needed the SIR coil and steering column wiring harness. However there may be some GM models that would need them replaced. But the ones I did already had the circuits for the cruise switches built into the existing SIR coil and steering column wiring harness. One way to check that is to remove the steering wheel airbag and check if the SIR coil connector is full of connector pins. If it is then plug in the new steering wheel with the cruise switches and watch data pids in the BCM data while operating the cruise switches to verify cruise switch signals are reaching the BCM.

Step 3

Install the required parts. At least the steering wheel with switches must be installed and verify switch signals are reaching BCM. Determine if vehicle needs SIR coil and steering column wiring harness.

Step 4

Program the appropriate modules on the vehicle with GM Service Programming System. The older models need only the BCM software update but the newer models need BCM and ECM/PCM software update. The software modification for cruise that AC Delco performed will stay with this VIN number. So anytime the BCM or ECM/PCM software is installed to the vehicle the cruise modification will always be installed as well. This will keep the cruise operational if any of those modules were to be replaced and programmed in the future.

Step 5

Clear codes and perform any calibrations required after software upgrades such as brake pedal calibration and test drive the vehicle. Operate all cruise functions and verify cruise cancel's properly with the brake pedal. Recheck for any codes. 

Hope this will help if you ever get a request for adding cruise control to a GM vehicle. I think that it is nice that GM gives us this option. 

Attached are pictures of the original steering wheel without the Switches

Original steering wheel

SIR coil connector full of connector terminals

New steering wheel with cruise switches

+10
Terry Diagnostician
Milton, Florida
Terry Default
 

David, a great write up and post. I recently ran into a similar situation with a stripped down 2017 Chevrolet Colorado. The customer wanted cruise control added, and was thinking going to low grade aftermarket unit. So , do you think it would be a similar set up? If so, what is approximately the cost, all things considered, time, parts, software. Thanks David for clear instructions. T …

0 Default Ð Bounty Awarded
David Owner
Metter, Georgia
David Default
 

The TSB only lists the GM Silverado/Sierra and the Express/Savanna models as available to upgrade to cruise. However if you could provide me with the VIN number I could possibly check if it is possible.

0 Default Ð Bounty Awarded
Brian Owner
Parma, Ohio
Brian Default
 

Thanks for the great post. I wonder how much the cruise option is from the factory?

0 Default Ð Bounty Awarded
Terry Diagnostician
Milton, Florida
Terry Default
 

David, heres the VIN on vehicle. I was mistaken it’s a 2018 GMC CANYON. 1GTG5BEA4J1262502 Thanks

0 Default Ð Bounty Awarded
David Owner
Metter, Georgia
David Default
 

I checked with AC Delco Aftermarket on this 2018 Canyon VIN number. The support representative put me on hold to check with his "higher ups" because he didnt see the option to add cruise available on this model. He came back and said it is not an option on these newer Canyon's and Colorado's. He said that the Express/Savanna, Sonic, and Cruze are available to be upgraded. And I also know that we…

0 Default Ð Bounty Awarded
Terry Diagnostician
Milton, Florida
Terry Default
 

Thanks David for help in looking. Btw, where did you get info, I subscribe to GM‘s SI. is it in that information sector, or elsewhere? Thanks again T

0 Default Ð Bounty Awarded
David Owner
Metter, Georgia
David Default
 

I contacted the Aftermarket help desk by phone call as outlined in Step 1 of my original post to get information on whether or not the Canyon is eligible for cruise. As far as the GM TSB: PIT4844G I found that in Identifix. This TSB outlines which Express/Savanna and Silverdo/Sierra models are eligible for the cruise upgrade. I would expect you can find that TSB in GM service information.

0 Default Ð Bounty Awarded
Terry Diagnostician
Milton, Florida
Terry Default
 

O, thanks for the great info

0 Default Ð Bounty Awarded