Cadillac CT4 2019–2025 — technical service bulletin
Bulletin 25-NA-037 · NHTSA communication 11019748 · issued Apr 30, 2025
Technical service bulletin
communication type
Engine
component
2019–2025
model years
26
vehicle entries
Official summary
This bulletin advises the tech that the Exhaust Roller Follower may be the issue with the engine Ticking noise, misfire or rough run and what to replace if found the cause.
Vehicles covered
- 2020 Cadillac CT4
- 2021 Cadillac CT4
- 2022 Cadillac CT4
- 2023 Cadillac CT4
- 2024 Cadillac CT4
- 2025 Cadillac CT4
- 2023 Chevrolet Colorado
- 2024 Chevrolet Colorado
- 2025 Chevrolet Colorado
- 2019 Chevrolet Silverado 1500
- 2020 Chevrolet Silverado 1500
- 2021 Chevrolet Silverado 1500
- 2022 Chevrolet Silverado 1500
- 2023 Chevrolet Silverado 1500
- 2024 Chevrolet Silverado 1500
- 2025 Chevrolet Silverado 1500
- 2023 GMC Canyon
- 2024 GMC Canyon
- 2025 GMC Canyon
- 2019 GMC Sierra 1500
- 2020 GMC Sierra 1500
- 2021 GMC Sierra 1500
- 2022 GMC Sierra 1500
- 2023 GMC Sierra 1500
- 2024 GMC Sierra 1500
- 2025 GMC Sierra 1500
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.