Which Model Years This Covers
This guide covers won't start on every Winnebago Solis model year from 2021 to 2026. Chassis generation drives most of the diagnosis, so the causes below are organized by year range — find your year and start there. Not sure of your chassis year? On Sprinter-based RVs the chassis model year is often one year behind the RV title year; verify with the 10th character of the VIN or the door-jamb sticker.
Causes and Diagnosis by Year Range
2021–2026
The 2021–2026 Winnebago Solis is built on the RAM ProMaster chassis — front-wheel drive, transverse 3.6L Pentastar V6 gasoline engine, and the 9-speed ZF automatic. Unlike Sprinter-based RVs, there's no DEF/DPF/SCR system to worry about, but the 2021–2026 production year falls within the window affected by the ProMaster 9-speed parking pawl recall — verify NHTSA recall status by VIN. The ProMaster is also the only chassis in the lineup without available adaptive cruise control, which matters for long highway days.
For the 2021–2026 model year, the most common root causes involve age-related wear, the specific engineering tolerances of the 2021–2026 production run, and documented chassis issues noted in the chassis context above.
What to Do
Start with the causes for your year range above. For a step-by-step diagnosis specific to your symptoms, use our free AI Expert chat or the interactive diagnostic tool — both know the Winnebago Solis inside and out, year by year.
In-Depth Guides
Read our detailed troubleshooting articles on this topic:
Model Year Notes
Production changes, recalls, and running fixes that matter for this vehicle, by year:
2021–2022
The 2021–2022 ProMaster uses the first-generation 62TE 6-speed automatic (Chrysler 62TE) paired with the 3.6L Pentastar V6 gasoline engine. Transmission complaints on this model year typically trace to torque converter shudder or fluid degradation rather than mechanical failure. The 2021–2022 also predates the 9-speed ZF transition, so any transmission shop familiar with 62TE Chrysler minivans will recognize the service procedures.
2023–2026
The 2023–2026 ProMaster uses the 9-speed ZF automatic (part of the FCA 948TE family) behind the 3.6L Pentastar V6. A specific parking-pawl recall affects multiple 9-speed production years — a VIN-specific recall lookup at nhtsa.gov is mandatory before any purchase. The 9-speed is generally smoother than the 62TE it replaced but has its own well-documented software-update history.
Other Winnebago Solis Issues
Owners of the Winnebago Solis also commonly report these problems: