2020 Ram 4500
The Verdict
The 2020 Ram 4500 has 3 owner complaints filed with NHTSA. The most reported issues are engine (2 complaints) and body (1 complaints). With a Klunk Score of 100/100, it earns a "Smooth Ride" rating. If you're shopping for a Ram 4500, consider the 2016 model year which has 66% fewer complaints.
Safe Bet
The 2016 has 66% fewer complaints
View the 2016 Ram 4500 dashboard →
Klunk Score: Smooth Ride
This vehicle year has significantly fewer complaints than average. A reliable choice.
How is this calculated?
The Klunk Score ranks this vehicle year against all others in our database based on total owner complaints filed with NHTSA. 100 = fewest complaints (top tier), 0 = most complained-about. Scores above 60 are better than average; below 40 means more problems than most.
Recalls 1
Active safety recalls from NHTSA for this vehicle year.
Custom Truck And Body Works is recalling certain 2020 Dodge 4500 and 5500 vehicles. In the affected suspension systems, the rear brake caliper flexible line may have been routed so that it contact...
Risk
A worn rear brake caliper flexible line may cause brake fluid leakage, which may result in a partial or complete loss of the rear brakes, increasing the risk of a crash.
Remedy
Custom Truck And Body Works will notify owners, and dealers will repair the affected suspension systems, and rear brake caliper flexible line, free of charge. Owners may contact Custom Truck And B...
Reported Apr 11, 2026
Get notified if a recall hits this car.
We email you when NHTSA issues a new recall on the 2020 Ram 4500. No spam, no marketing.
Under the Hood
Each number is a complaint. Darker = bigger problem.
By Category
By Severity
Worst Problems
Complaints
The contact owns a 2020 Ram 4500. The contact stated that while driving approximately 65 MPH during a rainstorm, the windshield wipers were activated; however, the windshield wipers failed to engage as needed. The contact attempted to activate the windshield wipers several times, but the windshield wipers stopped operating. The contact pulled over and waited out the rainstorm. The rain had not stopped, and the contact drove to a filling station, checked the electrical fuse for the windshield wipers, and then replaced the fuse. The contact stated that the wipers started to function, but only at the highest speed. The contact attempted to slow the windshield wipers, but when the wiper speed control was set to a slower speed, the wiper blades stopped working in the middle of the windshield. The contact drove to the residence with the windshield wipers functioning at high speed. The contact had taken the vehicle to a local dealer but had not yet received a diagnostic report. The vehicle was not repaired. The manufacturer was informed of the failure and referred the contact to the NHTSA Hotline to report the failure. The contact researched online and related the failure to NHTSA Campaign Number: 22V035000 (Visibility); however, the VIN was not included. The failure mileage was approximately 50,000.
The contact owns a 2020 Ram 4500. The contact received notification of NHTSA Campaign Number: 21V880000 (Fuel System, Diesel) and 22V035000 (Visibility) however, the parts to do the recall repairs were not yet available. The local dealer was contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repairs. The manufacturer was made aware of the issue. The contact had not experienced a failure. Parts distribution disconnect.
Truck turned off while driving and died. Would not turn back on. Was towing a 40ft gooseneck trailer with a load on it. Truck was stopped blocking multiple lanes of traffic. Truck and trailer had to be towed to nearest dealership where they found the CP4 fuel pump had failed and the entire fuel system needed to be replaced.