2015 RAM Promaster engine problems
16 owner complaints filed with NHTSA name the engine on the 2015 RAM Promaster — 27% of all complaints for this model year.
What owners report
“The contact's boyfriend owns a 2015 Ram Promaster 2500. The contact stated that while her boyfriend was driving at an undisclosed speed, the check engine warning light illuminated. The driver continued driving, and the vehicle entered LIMP Mode and failed to accelerate above 5 MPH. The vehicle was…”
filed Feb 4, 2026
“Driving 55mph on highway when, the vehicle began to shudder abnormally, resulting in pulling over to the shoulder of the interstate. Took vehicle to mechanic and learned oil coolant housing was leaking. This is a known design flaw by the manufacturer which can lead to engine damage and/or sudden…”
filed Feb 2, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
STARTER - ENGINE
109614 · Service Bulletin/Repair Instructions · issued Jan 13, 2026STARTER - ENGINE
109512 · Service Bulletin/Repair Instructions · issued Jan 8, 2026
Engine problems in other Promaster years
| Year | Reports | Share |
|---|---|---|
| 2023 Promaster | 10 | 14% |
| 2022 Promaster | 7 | 12% |
| 2021 Promaster | 6 | 6% |
| 2020 Promaster | 4 | 10% |
| 2019 Promaster | 9 | 16% |
| 2018 Promaster | 11 | 30% |
| 2017 Promaster | 19 | 33% |
| 2016 Promaster | 12 | 39% |
| 2014 Promaster | 13 | 18% |
Other reported problem areas on the 2015 RAM Promaster
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.