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Service bulletins for the 2021 Ram 4500

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

445 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

Bulletins, newest first
1062412025-08-06. Service bulletin. ELECTRICAL SYSTEM. LAMP - DOME
S258A0000172025-08-06. Service bulletin. ELECTRICAL SYSTEM. Door speaker Inoperative or No Sound
S2422000001 REV.D2025-07-31. Service bulletin. ELECTRICAL SYSTEM. Tire Pressure Monitor (TPM) Service Information. TPM Lamp On.
1056482025-07-23. Service bulletin. ENGINE. MODULE - ENGINE CONTROLLER
S25230000622025-07-02. Service bulletin. ELECTRICAL SYSTEM. Bumper Mounted 7 Pin Trailer Tow Connector
1049742025-06-26. Service bulletin. ELECTRICAL SYSTEM. LAMP - DOME
1055902025-06-17. Service bulletin. UNKNOWN OR OTHER. Warranty Newsletter – Volume 11, Issue 6
1055912025-06-17. Warranty extension. UNKNOWN OR OTHER. FCA Caribbean Warranty Newsletter – Volume 11, Issue 6
14-010-25 REV. B2025-06-10. Service bulletin. FUEL/PROPULSION SYSTEM. "Frequent Repairs Of Fuel System Components Such As Fuel Filters Numerous Stellantis vehicles having fuel line components replaced such as fuel filter. Occasionally, components are replaced before their standard life expectancy or when not contaminated with debris "
08-182-252025-06-10. Service bulletin. ELECTRICAL SYSTEM; SEATS. "Power Seat Not Adjusting Customers may experience one or more of the following: ● Driver and/or passenger seat moves backwards but not forward. ● Driver and/or passenger seat inoperative. This bulletin involves replacing the front power seat adjusters."
14-010-25 REV. A2025-06-02. Service bulletin. FUEL/PROPULSION SYSTEM. "Frequent Repairs Of Fuel Line Components Such As Fuel Filters Numerous Stellantis vehicles having fuel line components replaced such as fuel filter. Occasionally, components are replaced before their standard life expectancy or when not contaminated with debri "
1053222025-06-02. Service bulletin. ENGINE. D-19-02 Rev. L Fast Feedback Program - 6.7L Cummins Complete Engine, Long Block & Short Block - 2019 - 2024 HD Ram - (D2/DD/DF/DJ/DP)
S25090000052025-06-02. Service bulletin. ENGINE. Light Random Tick Noise From The Engine.
1049702025-06-02. Service bulletin. UNKNOWN OR OTHER. CORE - HEATER
02-002-252025-05-30. Service bulletin. SUSPENSION. "Shock And Strut Diagnosis And Replacement Guidelines Leaking, noisy, or weak shocks or struts. "
91005922025-05-29. Service bulletin. ELECTRICAL SYSTEM. LAMP Courtesy/Ambient Courtesy / Ambient Lamp: Light guide not fully seated into the retainer during IP sub-assembly due to inconsistent operator installation effort, leading to latent BSR issue that manifests under customer usage conditions. Solution: remove and reinstall light guide to be fully seated in the bracket retainer.
91005982025-05-29. Service bulletin. ENGINE; UNKNOWN OR OTHER. Module, Urea Pump/Level: HD 6.7L (ETL/ETN/ETM) with Mil On P21C4-00 (Reductant Line Heater Relay Control Circuit High / U11C1-00 (Reductant Control Module Received Implausible Data From ECM/PCM), do not replace the DEF Pump. Follow TSB's released and appropriate Service Diagnostics.
14-010-252025-05-20. Service bulletin. FUEL/PROPULSION SYSTEM. "Frequent Repairs Of Fuel Line Components Such As Fuel Filters Numerous Stellantis vehicles having fuel line components replaced such as fuel filter. Occasionally, components are replaced before their standard life expectancy or when not contaminated with debris "
S2323000002 REV.A2025-05-19. Service bulletin. ELECTRICAL SYSTEM. "Washer Light On And Will Not Turn Off After Adding Washer Solvent."
1037742025-05-01. Service bulletin. ELECTRICAL SYSTEM. LAMP - DOME
S25230000242025-04-04. Service bulletin. STRUCTURE:BODY; ELECTRICAL SYSTEM. Rear Defogger Solder Terminals Detached.
S2408000015 REV.D2025-04-03. Service bulletin. ELECTRICAL SYSTEM. Remote Keyless Entry (RKE) Functions Do Not Work, Intermittent Vehicle Response When Using the RKE, Key Not Programmed, Adding Remote Start
91005082025-03-28. Service bulletin. UNKNOWN OR OTHER. "6 CONTROL UNIT, Diesel Exhaust Customer complaints with malfunction light illuminated on 2019 thru 2024 MY DJ / D2 / DD / DP vehicles with 6.7L (ETL / ETM / ETN) built on or before October 15,2024 and exhibiting DTCs P21C4-00 (Reductant Line Heater Relay Control Circuit High) and / or U11C1-00 (Reductant Control Module received implausible Data from ECM / PCM). These DTCs will occur after installation of service DCU 68458603AB. Do not replace parts until after the TSB 25-008-24 is performed. If the DTC(s) continue to set, then follow the Service Diagnostics for the applicable DTC."
S1625000002 REV.B2025-03-13. Service bulletin. UNKNOWN OR OTHER. Malfunction Indicator Lamp (MIL) Illumination, Diagnostic Trouble Codes (DTCs) P21C4 – (Diesel Exhaust Fluid) Reductant Line Heater Control Circuit High, and U11C1 – Reductant Control Module Received Implausible Data From ECM/PCM, Set
1036222025-03-04. Service bulletin. SERVICE BRAKES. MODULE - ANTI-LOCK BRAKE SYSTEM

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.