Cadillac CT4 2021–2025 — technical service bulletin
Bulletin PIT6398 · NHTSA communication 11019827 · issued Jun 12, 2025
Technical service bulletin
communication type
Unknown OR Other
component
2021–2025
model years
34
vehicle entries
Official summary
This PI involves DTC U3000 SYM49 Set falsely In The Serial Data Gateway Module and dealerships are to reset the module by cycling the battery.
Vehicles covered
- 2021 Cadillac CT4
- 2022 Cadillac CT4
- 2023 Cadillac CT4
- 2021 Cadillac CT5
- 2022 Cadillac CT5
- 2023 Cadillac CT5
- 2021 Cadillac Escalade
- 2022 Cadillac Escalade
- 2023 Cadillac Escalade
- 2021 Cadillac Escalade Esv
- 2022 Cadillac Escalade Esv
- 2023 Cadillac Escalade Esv
- 2021 Chevrolet Corvette
- 2022 Chevrolet Corvette
- 2024 Chevrolet Silverado 2500
- 2025 Chevrolet Silverado 2500
- 2024 Chevrolet Silverado 3500
- 2025 Chevrolet Silverado 3500
- 2021 Chevrolet Suburban 1500
- 2022 Chevrolet Suburban 1500
- 2023 Chevrolet Suburban 1500
- 2021 Chevrolet Tahoe
- 2022 Chevrolet Tahoe
- 2023 Chevrolet Tahoe
- 2024 GMC Sierra 2500
- 2025 GMC Sierra 2500
- 2024 GMC Sierra 3500
- 2025 GMC Sierra 3500
- 2021 GMC Yukon
- 2022 GMC Yukon
- 2023 GMC Yukon
- 2021 GMC Yukon XL
- 2022 GMC Yukon XL
- 2023 GMC Yukon XL
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.