2012 Jeep Wrangler engine problems
172 owner complaints filed with NHTSA name the engine on the 2012 Jeep Wrangler — 21% of all complaints for this model year.
What owners report
“The engine's cylinder head/valve train has failed internally, allowing combustion gases to enter the cooling system — confirmed via a chemical block test performed by a master automotive technician on November 29, 2024, which verified combustion gases present in the coolant. This is a widely…”
filed Jul 7, 2026
“The contact owns a 2012 Jeep Wrangler. The contact stated that while driving at 20 MPH, the check engine warning light illuminated. The local dealer was contacted, but the vehicle was not diagnosed or repaired. The vehicle was taken to an independent mechanic, where a scan was completed, and…”
filed Apr 1, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Engine problems in other Wrangler years
| Year | Reports | Share |
|---|---|---|
| 2025 Wrangler | 23 | 39% |
| 2024 Wrangler | 390 | 59% |
| 2023 Wrangler | 95 | 28% |
| 2022 Wrangler | 85 | 23% |
| 2021 Wrangler | 213 | 24% |
| 2020 Wrangler | 50 | 8% |
| 2019 Wrangler | 42 | 6% |
| 2018 Wrangler | 98 | 5% |
| 2017 Wrangler | 61 | 20% |
| 2016 Wrangler | 88 | 19% |
| 2015 Wrangler | 125 | 27% |
| 2014 Wrangler | 322 | 50% |
Other reported problem areas on the 2012 Jeep Wrangler
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.