2021 RAM 3500 Problems: 7 Known Issues
2021 model year · 6,650+ owner reports · Updated October 2026
According to Au7o's analysis of 6,650+ owner reports, the 2021 RAM 3500 has 7 documented known issues, with 2 rated critical. The most serious are Aisin AS69RC Transmission Overheating and Converter Shudder ($300-$3,500 repair) and AAM 11.5/11.8 Front Axle Seal and U-Joint Failure ($200-$1,200 repair). The most commonly reported issue is Aisin AS69RC Transmission Overheating and Converter Shudder with 2,800 owner reports. Across all issues with published estimates, repair costs range from $50 to $4,000. DIY maintenance guides at au7o.io.
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All 7 Known Issues
NHTSA Recalls22 recalls
POWER TRAIN:AUTOMATIC TRANSMISSION:GEAR POSITION INDICATION (PRNDL)
Chrysler (FCA US, LLC) is recalling certain Ram 2500 and Ram 3500 vehicles equipped with a 3.5" cluster and column shifter. A software error may cause the gear selection display to be inaccurate. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 101, "Control and Displays."
ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
Chrysler (FCA US, LLC) is recalling certain 2025-2026 Ram 1500 Pickup, Ram 2500 Pickup, Ram 3500 Pickup, Ram 3500 Cab Chassis, 4500 Ram Cab Chassis, and Ram 5500 Cab Chassis vehicles. A software error may cause the instrument panel cluster display to be blank. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard numbers 135, "Light Vehicle Brake Systems," 105, "Hydraulic and Electric Brake Systems," and 102, "Transmission shift lever sequence, starter interlock, and transmission braking effect."
AIR BAGS: AIR BAG/RESTRAINT CONTROL MODULE
Chrysler (FCA US, LLC) is recalling certain 2025 Ram 2500 Pickup, 3500 Pickup, 3500 Cab Chassis, 4500 Cab Chassis, and 5500 Cab Chassis trucks. A software error in the occupant restraint controller module may cause the driver's side air bag and/or seat belt pretensioner not to deploy in a crash and disable the electronic stability control (ESC) system. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard numbers 208, "Occupant Crash Protection" and 126, "Electronic Stability Control Systems."
ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
Chrysler (FCA US, LLC) is recalling certain 2025-2026 Ram 1500 Pickup, Ram 2500 Pickup, Ram 3500 Pickup, Ram 3500 Cab Chassis, Ram 4500 Cab Chassis, and Ram 5500 Cab Chassis vehicles. A software error may cause the instrument panel display to fail. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standards numbers 102, "Transmission Shift Position Sequence," 105, "Hydraulic and Electric Brake Systems," 108, "Lamps, Reflective Devices, and Associated Equipment," 126, "Electronic Stability Control Systems for Light Vehicles," 135, "Light Vehicle Brake Systems," 138, "Tire Pressure Monitoring System," and/or 208, "Occupant Crash Protection."
EXTERIOR LIGHTING:BRAKE LIGHTS
Chrysler (FCA US, LLC) is recalling certain 2024-2026 Jeep Wagoneer S, 2025-2026 Ram 1500 Pickup, Ram 2500 Pickup, Ram 3500 Pickup, Ram 3500 Cab Chassis, Ram 4500 Cab Chassis, Ram 5500 Cab Chassis, and 2026 Jeep Cherokee vehicles. Due to an improperly designed trailer tow module, the trailer lights may fail to illuminate and the trailer brakes may fail.
+ 17 more recalls. Check all on NHTSA.gov
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Frequently Asked Questions
What are the most common RAM 3500 problems?
According to Au7o's analysis of 6,650+ owner reports, the 2021 RAM 3500 has 7 documented issues. The most frequently reported are: Aisin AS69RC Transmission Overheating and Converter Shudder, AAM 11.5/11.8 Front Axle Seal and U-Joint Failure, 6.7L Cummins Exhaust Brake Actuator and VGT Turbo Issues. Of these, 2 are rated critical and should be addressed promptly.
Is the RAM 3500 reliable?
The 2021 RAM 3500 has 7 known issues documented across 6,650+ owner reports. 2 issues are rated critical: Aisin AS69RC Transmission Overheating and Converter Shudder and AAM 11.5/11.8 Front Axle Seal and U-Joint Failure. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common RAM 3500 problems?
Repair costs for known RAM 3500 issues range from $50 to $4,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Aisin AS69RC Transmission Overheating and Converter Shudder, typically costs $300-$3,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2013-2025 RAM 3500 Aisin AS69RC Transmission Overheating and Converter Shudder?
The RAM 3500 equipped with the Aisin AS69RC 6-speed automatic transmission experiences torque converter shudder, overheating when towing, delayed shifts, and premature wear. The torque converter lockup clutch develops a shudder at light throttle and highway speeds. When towing he… Repairs typically run $300-$3,500. Severity: high.
What is the 2013-2025 RAM 3500 AAM 11.5/11.8 Front Axle Seal and U-Joint Failure?
The RAM 3500 4x4 with the AAM (American Axle Manufacturing) 9.25 front axle experiences premature front axle seal leaks and u-joint failures. Differential fluid leaks from the inner axle seals, contaminating the front brakes. The front axle u-joints (Dana Spicer 60) wear out prem… Repairs typically run $200-$1,200. Severity: high.
What is the 2013-2025 RAM 3500 6.7L Cummins Exhaust Brake Actuator and VGT Turbo Issues?
The RAM 3500 6.7L Cummins equipped with the integrated exhaust brake system experiences failures of the VGT (Variable Geometry Turbocharger) actuator and exhaust brake solenoid. The exhaust brake uses the VGT turbo vanes to create backpressure for engine braking while towing. The… Repairs typically run $200-$4,000. Severity: medium.
What is the 2010-2025 RAM 3500 Exhaust Manifold Stud Failure (6.7L Cummins)?
The exhaust manifold mounting studs on the 6.7L Cummins break due to repeated thermal expansion and contraction cycles. Broken studs allow the manifold to separate from the cylinder head, creating exhaust leaks that produce a ticking noise and reduce turbo efficiency. The center… Repairs typically run $400-$1,200. Severity: medium.
What is the 2010-2025 RAM 3500 Front Hub Bearing Failure Under Heavy Load?
The front hub bearings (wheel bearing assemblies) in the RAM 3500 fail prematurely, particularly on trucks that carry heavy loads in the bed or tow heavy trailers. The factory hub bearings are adequate for unloaded driving but wear rapidly under sustained heavy GVWR/GCWR conditio… Repairs typically run $300-$700. Severity: medium.
What is the 2010-2025 RAM 3500 Grid Heater Relay Failure (6.7L Cummins)?
The intake grid heater relay fails, preventing the grid heater from warming intake air during cold starts. The grid heater draws significant current (up to 200 amps), and the relay contacts eventually burn and weld or fail open. Without the grid heater, cold-start performance deg… Repairs typically run $80-$250. Severity: medium.
What is the 2013-2025 RAM 3500 5th Wheel / Gooseneck Prep Wiring Corrosion?
The factory 5th wheel and gooseneck towing prep wiring harness corrodes at the in-bed connector junction, particularly where it connects to the 7-pin and 4-pin trailer connectors under the bed. Water intrusion from rain, truck washes, and bed spray deteriorates the connector term… Repairs typically run $50-$300. Severity: low.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.