Cadillac Ats 2018–2021 — technical service bulletin
Bulletin 20NA187 · NHTSA communication 10181713 · issued Sep 9, 2020
Technical service bulletin
communication type
Power Train
component
2018–2021
model years
38
vehicle entries
Official summary
This technical bulletin provides a repair procedure to correct a customer concern of Delayed and/or Harsh Engagement of Transmission Shift After Vehicle Sitting with Engine Off.
Vehicles covered
- 2018 Cadillac Ats
- 2019 Cadillac Ats
- 2021 Cadillac CT4
- 2018 Cadillac CT6
- 2019 Cadillac CT6
- 2018 Cadillac CTS
- 2019 Cadillac CTS
- 2018 Chevrolet Camaro
- 2019 Chevrolet Camaro
- 2020 Chevrolet Camaro
- 2021 Chevrolet Camaro
- 2018 Chevrolet Colorado
- 2019 Chevrolet Colorado
- 2020 Chevrolet Colorado
- 2021 Chevrolet Colorado
- 2019 Chevrolet Corvette
- 2019 Chevrolet Express
- 2020 Chevrolet Express
- 2018 Chevrolet Silverado 1500
- 2019 Chevrolet Silverado 1500
- 2020 Chevrolet Silverado 1500
- 2021 Chevrolet Silverado 1500
- 2018 Chevrolet Silverado 2500
- 2019 Chevrolet Silverado 2500
- 2019 Chevrolet Silverado 4500
- 2018 GMC Canyon
- 2019 GMC Canyon
- 2020 GMC Canyon
- 2021 GMC Canyon
- 2018 GMC Savana
- 2019 GMC Savana
- 2021 GMC Savana
- 2019 GMC Sierra 1500
- 2020 GMC Sierra 1500
- 2021 GMC Sierra 1500
- 2018 GMC Sierra 2500
- 2018 GMC Sierra Denali
- 2019 GMC Sierra Denali
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.