Forum Discussion
Error message in DIC shows "Service Driver Assist System"
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.
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