Cadillac Celestiq 2024–2026 — technical service bulletin
Bulletin PIC6638A · NHTSA communication 11027944 · issued Jan 29, 2026
Technical service bulletin
communication type
Unknown OR Other
component
2024–2026
model years
31
vehicle entries
Official summary
This Preliminary information communicates to the technician the repair direction needed to address an inaccurate speed limit sign displayed on instrument cluster.
Vehicles covered
- 2025 Cadillac Celestiq
- 2026 Cadillac Celestiq
- 2025 Cadillac Escalade
- 2026 Cadillac Escalade
- 2025 Cadillac Escalade Esv
- 2026 Cadillac Escalade Esv
- 2025 Cadillac Escalade IQ
- 2026 Cadillac Escalade IQ
- 2025 Cadillac Optiq
- 2026 Cadillac Optiq
- 2026 Cadillac Vistiq
- 2024 Chevrolet Equinox EV
- 2025 Chevrolet Equinox EV
- 2026 Chevrolet Equinox EV
- 2024 Chevrolet Silverado EV
- 2025 Chevrolet Silverado EV
- 2026 Chevrolet Silverado EV
- 2024 Chevrolet Traverse
- 2025 Chevrolet Traverse
- 2026 Chevrolet Traverse
- 2024 GMC Acadia
- 2025 GMC Acadia
- 2026 GMC Acadia
- 2025 GMC Hummer EV Pickup
- 2026 GMC Hummer EV Pickup
- 2025 GMC Hummer EV SUV
- 2026 GMC Hummer EV SUV
- 2025 GMC Sierra EV
- 2026 GMC Sierra EV
- 2025 GMC Yukon
- 2026 GMC Yukon
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.