Cadillac CT4 2019–2021 — technical service bulletin
Bulletin 21-NA-275 · NHTSA communication 10244949 · issued Oct 10, 2023
Technical service bulletin
communication type
Power Train
component
2019–2021
model years
26
vehicle entries
Official summary
This service bulletin provides repair information to correct customer concerns of Rear Wheel Lock Up, ABS Event, Loud Bang and a Flashing â Dâ on Driver Information Center (DIC) when Lightly or Moderately Accelerating Forcing an 8-7 or 8-6 Downshift.
Vehicles covered
- 2020 Cadillac CT4
- 2021 Cadillac CT4
- 2020 Cadillac CT5
- 2021 Cadillac CT5
- 2019 Cadillac CT6
- 2020 Cadillac CT6
- 2021 Cadillac CT6
- 2021 Cadillac Escalade
- 2021 Cadillac Escalade Esv
- 2020 Chevrolet Silverado 1500
- 2021 Chevrolet Silverado 1500
- 2020 Chevrolet Silverado 2500
- 2021 Chevrolet Silverado 2500
- 2020 Chevrolet Silverado 3500
- 2021 Chevrolet Silverado 3500
- 2021 Chevrolet Suburban
- 2021 Chevrolet Suburban 1500
- 2021 Chevrolet Tahoe
- 2020 GMC Sierra 1500
- 2021 GMC Sierra 1500
- 2020 GMC Sierra 2500
- 2021 GMC Sierra 2500
- 2020 GMC Sierra 3500
- 2021 GMC Sierra 3500
- 2021 GMC Yukon
- 2021 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.