Porsche Cayenne 2018–2023 — technical service bulletin

Bulletin No. 173-21 · NHTSA communication 11022997 · issued Aug 28, 2025

Technical service bulletin

communication type

Engine

component

2018–2023

model years

vehicle entries

Official summary

Technical information for a warning message "coolant temperature too high" checking coolant pump and change over valve

Vehicles covered

2018 Porsche Cayenne
2019 Porsche Cayenne
2020 Porsche Cayenne
2021 Porsche Cayenne
2022 Porsche Cayenne
2023 Porsche Cayenne
2019 Porsche Cayenne E-Hybrid
2020 Porsche Cayenne E-Hybrid
2021 Porsche Cayenne E-Hybrid
2022 Porsche Cayenne E-Hybrid
2023 Porsche Cayenne E-Hybrid
2020 Porsche Cayenne GT
2021 Porsche Cayenne GT
2022 Porsche Cayenne GT
2021 Porsche Cayenne GTS
2022 Porsche Cayenne GTS
2023 Porsche Cayenne GTS
2018 Porsche Cayenne S
2019 Porsche Cayenne S
2020 Porsche Cayenne S
2021 Porsche Cayenne S
2022 Porsche Cayenne S
2023 Porsche Cayenne S
2018 Porsche Cayenne S E-Hybrid
2020 Porsche Cayenne S E-Hybrid
2018 Porsche Cayenne Turbo
2019 Porsche Cayenne Turbo
2020 Porsche Cayenne Turbo
2023 Porsche Cayenne Turbo
2020 Porsche Cayenne Turbo Coupe
2022 Porsche Cayenne Turbo GT
2023 Porsche Cayenne Turbo GT
2019 Porsche Cayenne Turbo S E-Hybrid
2020 Porsche Cayenne Turbo S E-Hybrid
2021 Porsche Cayenne Turbo S E-Hybrid
2022 Porsche Cayenne Turbo S E-Hybrid
2023 Porsche Cayenne Turbo S E-Hybrid
2020 Porsche Cayenne Turbo S Hyb Coupe
2018 Porsche Macan GTS
2019 Porsche Macan GTS
2020 Porsche Macan GTS
2021 Porsche Macan GTS
2022 Porsche Macan GTS
2023 Porsche Macan GTS
2018 Porsche Macan S
2019 Porsche Macan S
2020 Porsche Macan S
2021 Porsche Macan S
2022 Porsche Macan S
2023 Porsche Macan S
2018 Porsche Macan Turbo
2020 Porsche Macan Turbo
2021 Porsche Macan Turbo
2022 Porsche Macan Turbo
2023 Porsche Macan Turbo

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.