Jeep Wrangler 2018–2021 — technical service bulletin
Bulletin 9100134 · NHTSA communication 10234376 · issued Feb 13, 2023
Technical service bulletin
communication type
Engine and Engine Cooling
component
2018–2021
model years
4
vehicle entries
Official summary
Engine When replacing a GMET4 long block from a 2021 JL or older, you will need to carry over the injector wiring harness from the original engine, and the Fuel pressure sensor should be replaced with part number: 68212572AB.
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.