NHTSA Complaint #11553939 — 2021 FORD F-350

The Diesel Emission Fluid Injectors are becoming clogged due to crystalized DEF. This causes a DEF error to be generated which de-rates the vehicles speed over time from 50mph to 5 mph over a range of ~50 miles. In remote areas with desert, like where I live this can cause you to be limited to 5 mph on an 80 mph fwy which is incredibly dangerous, especially when some of the more remote fwys are 1-2 lane with limited emergency lanes for nearly 100 miles (especially over bridges). My understanding is this speed limitation is not due to the mechanical operation but is a manufacturer software introduced fault condition, which cannot be bypassed. This also appears to be a wide spread issue as my truck has been sitting in the Ford dealership lot for 2 months waiting for a new injector as these are nationally out of stock. Ford has changed the design on 2023-2024 trucks, the new parts are not forward and backward compatible. Was the design change due to reliability issues with their previous design, should there be a recall for existing customers. P.S. I have a 2021 F350 with less than 15000 miles.