3.6L Pentastar valvetrain — still the engine to listen tomajor
- 3.6L Pentastar V6
The 3.6L Pentastar V6's rocker arms and camshaft lobes wear the same way they do on the earlier WK2 years — a top-end tick that becomes a misfire, with a teardown mechanic quoting $1,000 to $2,000 caught early and more once damage spreads. Chrysler's service bulletins cover the misfire-and-valvetrain-noise condition across these years. It's less prominent in the 2019 file than in 2018, but the check is the same: listen for the tick, scan for misfire codes.
Sources: NHTSA complaint database, 2019 Jeep Grand Cherokee · Independent mechanic channel transcripts (WK2 Grand Cherokee)
$1,000–$2,000
Rocker/lifter repair caught early (mechanic-quoted)
several thousand
If damage extends into the engine