Jeep Grand Cherokee 2017–2018 — technical service bulletin
Bulletin EmissionsW91 · NHTSA communication 10220588 · issued Feb 18, 2021
Technical service bulletin
communication type
Power Train
component
2017–2018
model years
3
vehicle entries
Official summary
Emissions Recall W91 Reprogram Powertrain Control Module
Vehicles covered
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.