Buick Lacrosse 2016–2022 — technical service bulletin

Bulletin 21NA278 · NHTSA communication 10205594 · issued Nov 23, 2021

Technical service bulletin

communication type

Electrical System

component

2016–2022

model years

vehicle entries

Official summary

This service bulletin provides diagnostic strategy information to aid in diagnosing a Ticking, Tap or Rattle Noise from Engine with Possible Misfire, Malfunction Indicator Lamp (MIL) Illuminated.

Vehicles covered

2017 Buick Lacrosse
2018 Buick Lacrosse
2019 Buick Lacrosse
2018 Buick Regal
2019 Buick Regal
2020 Buick Regal
2016 Cadillac Ats
2017 Cadillac Ats
2018 Cadillac Ats
2019 Cadillac Ats
2020 Cadillac CT5
2021 Cadillac CT5
2022 Cadillac CT5
2016 Cadillac CT6
2017 Cadillac CT6
2018 Cadillac CT6
2019 Cadillac CT6
2020 Cadillac CT6
2016 Cadillac CTS
2017 Cadillac CTS
2018 Cadillac CTS
2019 Cadillac CTS
2017 Cadillac XT5
2018 Cadillac XT5
2019 Cadillac XT5
2021 Cadillac XT5
2022 Cadillac XT5
2020 Cadillac XT6
2021 Cadillac XT6
2022 Cadillac XT6
2019 Chevrolet Blazer
2020 Chevrolet Blazer
2021 Chevrolet Blazer
2016 Chevrolet Camaro
2017 Chevrolet Camaro
2018 Chevrolet Camaro
2019 Chevrolet Camaro
2020 Chevrolet Camaro
2021 Chevrolet Camaro
2022 Chevrolet Camaro
2017 Chevrolet Colorado
2018 Chevrolet Colorado
2019 Chevrolet Colorado
2020 Chevrolet Colorado
2021 Chevrolet Colorado
2022 Chevrolet Colorado
2017 GMC Acadia
2018 GMC Acadia
2019 GMC Acadia
2021 GMC Acadia
2022 GMC Acadia
2017 GMC Canyon
2018 GMC Canyon
2019 GMC Canyon
2020 GMC Canyon
2021 GMC Canyon
2022 GMC Canyon

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.