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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.
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