Forum Discussion
Error message in DIC shows "Service Driver Assist System"
Purchased a New 2024 CT4. Super Cruise & Lane Keep do not work. Called OnStar and they confirmed my account active and the highways were Super Cruise compatible. Set adaptive cruise and then Super cruise button but no white steering wheel icon appears. The DIC shows "Service Driver Assist System" at start-up.
22 Replies
I am experiencing the same issues with 2025 Sierra 1500 Denali Ultimate. DIC shows "Service Driver Assist System" at start-up and Super Cruise does not work. I have verified via OnStar app that account and services are active. When using Super Cruise I receive a message that no connection available. I am logged into Google and able to use Google Maps.
eejd : Is there a fix?
eejd: Does the Lane Assist button need to be on to use Super Cruise?
Firstly, our team would like to take this moment to congratulate you on the purchase of your new 2024 Cadillac CT4. We are happy to welcome you to both the Cadillac and OnStar families. We're sorry to hear that you've been having troubles engaging your vehicles' Super Cruise functions. Our team would like the opportunity to look into this alongside you and your preferred dealership in order to best ensure that these service difficulties are resolved and restored in as timely a manner as possible. When you see this, please send an email with these details to socialmedia@gm.com, with, "ATTN: OS Community/dasto," in the subject line so that we can locate your message. We're looking forward to receiving your message and providing further support on this matter.
Today (12/30/2024) I went to the Sebring Cadillac dealer and they set an appointment for January 14th to look at my car.
It sounds like you're on the right track to have these concerns addressed and resolved as quickly as possible. Our team would be more than happy provide an added layer of support between yourself and the service team through this process. If you would like to proceed with this assistance, kindly send us an email with the instructions from out previous message. We're looking forward to seeing you out there using Super Cruise in your new Cadillac. Our team will keep an eye on our inbox.
Status: Went to my appointment at dealer on Jan 14th. Dealer has ordered a part.
We're glad to know that these concerns are being actively addressed by our friends at Sebring Cadillac. Our team is confident in their ability to get you back on the road with the Cadillac you love and rely on in no time. If at any point you decide that you'd like an additional layer of support between yourself and the dealer during the repair process, please don't hesitate to send us an email (with the appropriate subject that we mentioned in our previous message) so that we may connect further on this matter. Our team is always happy to help our dedicated and loyal members. We hope to hear from you soon.
My 2024 CT4 has been at Alan Jay Cadillac since January 24th and no news on progress of a solution for non-functional Super Cruise since purchase.
Thank you for keeping us in the loop on this matter with your 2024 CT4. We can certainly understand your frustration over not receiving any updates on the status of your Cadillac. Our team would be happy to reach out to the service department on your behalf in order to provide you with the most current information on the status of these repairs. In order to proceed, please send us an email with these details to socialmedia@gm.com with, "ATTN:OS Community/dasto," so that we may continue to best support you through this process. Our team hopes to hear from you soon.
I hope you have better luck than me. Bought Sierra 1500 Denali with Supercruise in February. Had it 4 days when "Service Driver Assist System" message appeared. Since then it has been in the shop 7 times for the same message, during which 3 modules have been replaced and two reprogrammings done. Last week it was in the shop again for same message plus OnStar failure (both of which were working again by the time I had my service appointment). Kept it three days, GM rep looked at it, and could find nothing wrong. I got it back last Friday and on Tuesday got the "Service Driver Assist System" message again. I called the dealer who said a GM Field Engineer would look at it next week.
I'm beginning to think it can't be repaired. My dealer is trying very hard to fix it but hasn't been able to keep it fixed because different things keep failing and some problems are intermittent so hard to track down. The GM Customer Service people's job seems to be to make soothing noises while doing nothing and telling me to talk with my dealer. I have questions my dealer is unable to answer and was told by GM Customer Service (who also can't answer these questions) that there is no one at GM who will talk with me about them and I should keep asking my dealer. I was advised by my dealer not to use Supercruise while the "Service Driver Assist System" message was present; since this applies to most of the time I've had the truck I haven't been able to use it much. The one trip made when it was working it was great.
Maybe the end game is for me to continue bringing it in over and over until I give up or the warranty runs out.
TBTX: I pasted my work order here in case it helps. The Cadillac dealer had the car about 2 weeks and worked with a GM engineer over the phone. It has worked flawlessly since early February. I love it. Good Luck to you.
Many thanks! I'll share this with my service department. The service department has been great--very diligent and trying very hard. Just seem to be more bugs than fixes so far. This may help. Thanks again!
I have had constant issues with my SC since the download update in May, 2025. One dealer had the mechanic replicate this issue of it shutting off mid lane change and swerving back but they could not find the reason. They got corporate involved and magically came back with, we can find no issues and it works as intended. I complained relentlessly to GM and got the service driver assist system and the shed to look at it again. After extensive driving by the mechanic over 2 weeks it acted up on the mechanic they talked work GM corporate and magically came back again saying nothing is won't because they came find any failed part. They gave it back to me last week and said to drive it again and see if it acts up. Good luck. GM is losing a 40 year customer with this lack of care, concern. This was on a 24 GMC Sierra ultimate
One more word of advice. If your state is a one party recording state, start recording every conversation.
Same for me. 2024 Lyriq. Another dealer visit. Another waste of time?? Will update the forum next week.
Similar problem on 2025 Sierra Denali Ultimate. Have appointment on 22 Dec 25. This will the third time to have truck in for the problem in the past 6 months. Just under 10,000 miles. I’m not one to be satisfied with repetitive problem with no apparent solution. Less frustrating to just trade it off!
Our team appreciates you bringing this concern with your 2025 GMC Sierra Denali Ultimate's Driver Assist System, @Rockb. We understand how frustrating it can be when difficulties persist without a satisfactory resolution and would be more than happy to help make sure that this trouble is appropriately identified and resolved by your preferred GMC dealership. When you have a moment, please send a private message with some more details to OnStar_Support to best proceed with this support. You may click the envelope icon at the top right of your screen to begin. Our team will be keeping an eye out for your response and hopes to connect again very soon.