Skip to content
EnginePart report

2020 Ram 3500 Engine Problems

Complaints
27about this part
Share
23%of 116 total for the year
Median mileage
28,500miles
Trend
FallingComplaints filed in the last 3 full calendar years are at least 25% lower than in the 3 years before.

NHTSA recorded 27 complaints about the engine of the 2020 Ram 3500, 23% of the 116 complaints for this model year. Where a mileage was given, the median is 28,500 miles. 1 of these say a crash was involved and 4 a fire, according to the filers.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“We were driving our 2020 Ram 3500 diesel with a 2000-pound truck camper in the bed on a city street attempting to make a right turn through a yield sign when the engine suddenly stopped completely without the ability to restart it. This resulted in sudden loss of acceleration, power steering, and power breaks, leading to a near collision with a large pole and possibly other vehicles in the in the intersection. Although we missed the pole and other vehicles, it was extremely difficult to avoid due to loss of power steering and braking. …”

NHTSA complaint #11415339, filed 2021-05, 30,900 miles

“While driving at highway speed a rod came through the engine block. I was fortunate I was able to coast to the shoulder of the highway before coming to a complete stop. I was towing a trailer. The engine gave no indication anything was wrong. The only notable thing was the lost of fuel mileage that begin to decrease earlier in the day. The Ram engineering department is holding up the dealer from repairing the engine. They also have another there with a similar issue. They can't provide a timeframe on when the repair will be done. No rental or loaner vehicle is given. …”

NHTSA complaint #11390442, filed 2021-01, 33,000 miles

“I bought my truck in tampa, fl in august with 23k miles truck has 30k now I was driving thanksgiving morning after filling tank off in a trusted gas station that I fill all my 3 trucks 2016, 2018, 2020 Ram 3500. I drove about 35 miles and truck started to decelerate lost power within 2 miles and engine shut down and never started again I took to the arrigo dodge tamarac dealer and after 6 days the mechanic diagnosed that fuel has regular gas in it because they never has seen this to happened before. They said the only was fuel pump explode is that lacks of lubrication. …”

NHTSA complaint #11378173, filed 2020-12, 30,000 miles

“The 2019 to 2020 model year Ram 2500 heavy duty equipped with a 6.7l cummins diesel engine has a safety issue that could cause a stall and increase the risk of a crash. The bosch cp4.2 fuel injection pump has a very high rate of sudden failure leading to immediate stoppage on the engine and engine braking system.the pump destroys itself and takes out the rest of the entire fuel system leading to repairs in the $15,000-20,000 usd range. Fca & Ram have attempted to revise the pump in late (july) 2020 to solve the issue but the failures keep occurring. …”

NHTSA complaint #11386681, filed 2021-01, 12,500 miles

“The 2019 to 2020 model year Ram 2500 heavy duty equipped with a 6.7l cummins diesel engine has a major safety issue that could cause a stall and increase the risk of a crash. The bosch cp4.2 fuel injection pump has a very high rate of sudden failure leading to immediate stoppage on the engine and engine braking system. The pump destroys itself and takes out the rest of the entire fuel system leading to repairs in the $20,000 usd range. Fca & Ram have attempted to revise the pump in late (july) 2020 to solve the issue but the failures keep occurring. …”

NHTSA complaint #11387099, filed 2021-01, 1,834 miles

Related service bulletins

Engine: other model years

YearComplaintsShare of year
2026311%
202537%
2024613%
2023318%
20222312%
20211016%
20202723%
20192216%
2018152%
2017289%
20162116%
20152820%
20142914%
20132723%
2007117%

Other parts of the 2020 Ram 3500

Fuel system
57 complaints
Transmission and drivetrain
12 complaints
Electrical system
9 complaints
Brakes
8 complaints
Steering
7 complaints
Wheels
7 complaints
Other or unknown
6 complaints
Tires
5 complaints
Engine cooling
4 complaints
Body and structure
4 complaints
Vehicle speed control
3 complaints
Air bags
2 complaints

← All problems reported for the 2020 Ram 3500

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology