2021 Ram 2500 — Should You Buy One?
Typical asking price: $42,000–$72,000. There is 1 high-severity known issue you need to know before handing over a check.
Kestrel Take
A serious heavy-duty truck and the 6.7L Cummins diesel is one of the most legendary truck engines ever made. Get the Cummins or walk.
What we checked
Reconciled against public records, 2026-09-11
NHTSA holds 106 owner complaints for the 2021 Ram 2500, across 8 recall campaigns.
A big number here usually means a lot of these were sold, not that it is a bad vehicle — popular models collect more complaints for the same rate of trouble. So the total on its own says little. What is worth reading is the shape of it. 33% of them are about one thing — electrics and electronics. That much concentration is a genuine pattern rather than background noise, and it is the first thing to check on any example you look at.
8 recall campaigns cover this model year. Recalls are repaired free, for any owner, with no time limit on most safety campaigns — but only if someone books it in. Ask the seller to show it was done, or have any dealer check the VIN; it takes them a couple of minutes and costs nothing.
Counts come from the NHTSA complaint and recall database — free, public, and worth checking yourself.
Known Issues for the 2021 Ram 2500
Ranked by wallet impact. These are documented, recurring problems — not freak accidents.
The Aisin 6-speed had documented shudder and harsh-shift issues on 2021 builds. TSBs addressed most cases.
Repair cost (estimate): $0 software to $5,000 rebuild
Source: NHTSA complaints filed under the transmission and drivetrain (24).
DEF sensor failures and heater issues trigger warning lights and can cause a speed-limiting limp mode if ignored.
Repair cost (estimate): $200-$1,500
Source: NHTSA complaints filed under electrics and electronics (35).
Walk-Away Red Flags
- ✗6.4L Hemi for heavy towing — not built for the same workload as the Cummins
- ✗DEF warning lights active or contamination history
Good Signs
- ✓6.7L Cummins diesel — one of the most reliable truck engines ever made
- ✓All transmission TSBs applied and documented
- ✓Clean DEF system
Found a specific Ram 2500?
This page covers what goes wrong on the 2021 Ram 2500 in general. The Kestrel report covers this specific car— the asking price vs. market, the photos, the seller's description, and a BUY / NEGOTIATE / WALK AWAY verdict with a negotiation script.
Get My Verdict — $7.99No account required. Delivered to your inbox, usually within minutes.
Not ready to pay for one? The free read is instant and needs no card — it checks the asking price against the market and names the top issues for this year. It stops short of the verdict, because that needs the photos.
Known issues on this page are based on documented owner reports, NHTSA complaints, class-action records, and manufacturer technical service bulletins. Individual vehicles vary. A pre-purchase inspection by a trusted mechanic is always worth doing.
More from Ram
Similar trucks & pickups
2022 Ford F-150 Lightning
$45,000–$65,000
2020 Ford F-350 Power Stroke
$42,000–$60,000
2023 Ford F-150
$36,000–$65,000
2022 Toyota Tundra
$38,000–$62,000
2019 Ford F-350 Super Duty (6.7L Power Stroke)
$40,000–$58,000
2019 Ram 3500 Cummins
$40,000–$58,000
2022 Rivian R1T
$55,000–$75,000
2022 GMC Sierra 1500
$35,000–$60,000
No bullshit, no upsells, no affiliate links. One report, one price — we'll never charge you rent for your own thinking.
Think we got something wrong? Tell us — a real person reads every message.