2021 Ram 3500
Common problems & what to know before you buy
Before you message the seller, know the documented failure patterns, repair cost exposure, and risk level for the 2021 Ram 3500.
What to watch for on the 2021 Ram 3500
High-Pressure Fuel Pump Failure
The high-pressure fuel pump can fail, most often after water or poor fuel gets in, and spread metal through the injectors and lines.
Diesel Emissions System Faults (DEF, DPF, NOx sensors)
The emissions hardware is the most common source of warning lights and limp mode, especially on trucks driven mostly on short trips.
Which of these apply to your 2021 3500?
Your guide shows which apply to the exact car, and what to ask the seller.
Recalls on the 2021 Ram 3500
Electrical system: relays/solenoids
7L Turbo Diesel engines.
Air bags: curtain
The side air bag inflatable curtain (SABIC) assemblies may have been manufactured with the incorrect amount of compressed gas, which can…
Wheels: lugs/nuts/bolts/studs
Incorrect information in the Service and Owner's Manuals may cause the flanged lug nuts to be over-tightened, which could result in a…
6 more in the guide, with whether each one was done on the car you're looking at.
Source: NHTSA
What 62 owners reported
Source: NHTSA
2021 Ram 3500 at a glance
- Trims
- Big HornLaramieLimitedLimited LonghornLone StarTradesman
- Engine
- 5.7L 8-Cylinder, 6.4L 8-Cylinder, 6.7L 6-Cylinder Turbo Diesel
- Transmission
- Automatic 8-spd, Automatic 6-spd
- Drivetrain
- RWD, 4WD
- Fuel
- Gasoline, Diesel
- Body style
- Truck
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Frequently asked questions
What are the common problems with the 2021 Ram 3500?
Owners have filed 62 complaints about the 2021 Ram 3500 with NHTSA, most often about the electrical system. There are 9 recall campaigns covering this model year. Known problems on its engines include high-pressure fuel pump failure and diesel emissions system faults. Squeezed's free research-backed buyer guide cross-references these against documented failure patterns and mileage-stage risks, sorted by severity, in about a minute.
Is the 2021 Ram 3500 reliable?
Reliability depends heavily on the specific configuration and how the car was maintained. Start with the 9 open recall campaigns on this model year and confirm the work was completed. Generate a Squeezed buyer guide for this exact vehicle to see a reliability snapshot, repair-cost exposure, and the questions to ask the seller before you buy.
Should I still get a pre-purchase inspection on a 2021 Ram 3500?
Always. A Squeezed buyer guide is the triage step before the inspection: it shows you the documented failure patterns and what to check so you can decide which 2021 Ram 3500 listings are even worth a mechanic's time, then walk into the PPI knowing exactly what to look for.
Squeezed is a buyer guide based on public data and industry patterns, not a mechanical inspection. Always get a professional pre-purchase inspection before you buy.