Forum Discussion
GMC PIT6455B (Version 3)
When are we likely to see a fix for this issue (OTA or otherwise)? I have a brand new 2026 Sierra 1500 Denali and the intermittent yet regularly reoccurring 'Service Driver Assist' message and inoperable (red light) alert for the OnStar service that I am paying for is getting really old, really quickly.
| Date | Bulletin | Change |
|---|---|---|
| November 20, 2025 | PIT6455 — Version 1 | GM identifies the condition as a software anomaly. No repair for either 2025 or 2026 trucks. Engineering investigating. |
| May 4, 2026 | PIT6455A — Version 2 | GM announces that an OTA correction has been released for 2025 trucks. The 2026 investigation remains open. |
| June 22, 2026 | PIT6529 — Version 1 | GM publishes the detailed K73 OnStar/telematics update procedure for affected vehicles through model year 2025. |
| July 6, 2026 | PIT6455B — Version 3 | GM adds a direct reference to PIT6529 for 2025 trucks. The 2026 guidance remains unchanged: no remedy yet. |
Because this known issue is not classified as a GMC recall the dealer apparently had no obligation to disclose this PIT and the associated fault at the time of the sale.
Disgruntled GMC customer.
5 Replies
Thank you. I am willing to provide my VIN privately if OnStar needs it to review my individual vehicle.
However, my questions are not limited to my account or a single truck. They concern the publicly issued bulletin PIT6455B and the status of a remedy for affected 2026 vehicles. Those are matters that would benefit all owners experiencing the same problem.
I would therefore appreciate a public response addressing whether GM has identified the root cause, whether a software update is being developed or validated, and whether any estimated timeframe or updated dealer guidance is available. Account-specific assistance can certainly continue by private message, but the general status of this known issue should remain available to the broader owner community.Our team understands how important it is for you to have a clear outline on how your concerns are being handled. Please know that your sentiments are being documented within our internal teams. At this time as our engineers are actively working for a solution for this concern, we are not able to provide a specific timeline. We encourage you to keep in touch with your dealership's service team for the most up to date information. Our team is always available via private message to further assist you. We appreciate your understanding.
Thank you for the response, Sam. I appreciate the acknowledgment, but affected 2026 owners have now been told for months that engineering is investigating.
Can you provide any additional detail on the current status, such as whether GM has identified the root cause, whether a software update is in validation, or whether there is any expected timeframe for a remedy?
In the meantime, owners are continuing to experience intermittent loss of OnStar and driver-assistance functions, so more specific guidance would be helpful.Our team recognizes your frustration. If you would like additional assistance, please send a private message to OnStar_Support with your full name and OnStar Account number or VIN. Just select the envelope at the top right of your screen to get started. We are here to support you however we can.
It does not go unnoticed how impactful this concern has been for our customers. Please be assured that our engineers are actively looking into a resolution for this Service Driver Assist message for affected 2026 vehicles. We understand and share your desire to see this update and appreciate your ongoing patience in the meantime.