The cable connecting the engine block heater caught on fire near the plug. My right hand, thumb and index finger were burned while disconnecting the cable. I was able to stop fire from consuming the vehicle. How ever cable is burned near the 3 pronged connector.
2021 Ford F-350 engine problems
severe 8 complaints filed with NHTSA · avg repair $3,100
Complaints
8
Recalls
0
Crashes
0
Avg fix
$3,100
What owners are reporting 4 most recent
On 11/19/25 , my 2021 Ford f350 burned to the ground due to engine malfunction. From what the fire department said.
This truck on a daily basis, shuts down with out warning. Check engine light comes on some time, some times get P0191, P0171 and other codes dealing with fuel rail and pressure. Vehicle had less than 10000 miles when started. Dealer don't know what to do. Shuts off when you are in a turn and leaves you with out steering, and shuts off when coming to a stop sign, or trying to park. Fuel filters hav…
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…
Common questions
How serious is the engine problem on the 2021 Ford F-350?
It's a meaningful issue. 8 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $3,100.
At what mileage does the engine typically fail?
Mileage data is limited for this issue. Owners report failures across a wide range, suggesting cause is more about driving conditions and maintenance than mileage alone.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Other problem areas on this vehicle
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Severity ratings are derived from reported crashes, fires, injuries, and fatalities.
Repair cost estimates are independent-shop national averages and may differ in your area.
Some links on this page are affiliate links.