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Service bulletins for the 2018 Ram 3500

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.

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

By type

By component

By trouble code

By topic

Only bulletins with component: Transmission and driveline are shown. Show all

Bulletins, newest first
18-036-202020-05-26. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM. Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. This bulletin fixes all vehicles listed and also contains an optional software path for situations where the customer is specifically complaining of a drone noise, shudder, pulsation, or vibration under light throttle applications, while vehicle is operating in Multi Displacement System/Economics (MDS/ECO) mode (optionalsoftware available for D2&DJ vehicles).There will be two separate software options displayed on the wiTECH flash tab. The software file released for this condition contains the verbiage ?MDS NOISE?. The other file is the standard software that does not contain improvements for the drone/shudder concern. If for some reason the customer finds this shudder improvementobjectionable, the PCM software may be returned/reflashed to the standard version.Both software versions will address the remaining conditions noted in the bulletin.The customer may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble Codes (DTCs):P3402 - Cylinder 1 Deactivation Control Performance. P3426 - Cylinder 4 Deactivation Control Performance. P3442 - Cylinder 6 Deactivation Control Performance. P3450 - Cylinder 7 Deactivation Control Performance. P0128 - Thermostat Rationality. Customers may also describe the following condition:Heater not warming cabin sufficiently and engine slow to warm up. This condition could be caused by a malfunctioning thermostat which is not associated with an HVAC issue.
90042182020-04-06. Service bulletin. EQUIPMENT; POWER TRAIN. CASE ASSEMBLY, Differential For concern of shudder/chatter/vibration from the rear axle that is more prominent during turns and customer has the following: 1) Limited Slip Differential 2) No record of rear axle oil being serviced in the last 20,000 miles 3) No apparent damage to the axle/differential case or differential case internal gears Service the rear axle oil with new and test drive to see if condition is still present. If still present follow standard diagnostic procedures and contact FCA Redacted Content for further assistance.
21-043-192019-12-16. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN. Flash: Transmission Control Module (TCM) Updates This bulletin involves reprogramming the TCM with the latest available software. The customer may notice a harsh 2-3 and 3-4 shift. The following software enhancements are available:2-3 and/or 3-4 shift improvements.
553092019-07-15. Service bulletin. EQUIPMENT; POWER TRAIN. Power Transfer Unit
545832019-07-15. Service bulletin. POWER TRAIN. Transmission ? With Torque Converter
90039882019-07-15. Service bulletin. POWER TRAIN. Brake Transmission Shift Interlock (BTSI) Please contact Stacey Davis at (248) 260-6078 or stacey.davis@fcagroup.com if the following scenario occurs; The T79 or U11 recall was completed where the shifter inspection was acceptable and the software flash was performed but then the customer comes back needing the BTSI bracket replaced for coming out of park without the brake or key.
90040162019-07-15. Service bulletin. ELECTRICAL SYSTEM:STARTER ASSEMBLY:SOLENOID; POWER TRAIN. SOLENOID, Transmission For vehicles equipped with 68RFE transmission (sales code DG7) setting only a P0870 DTC, please refrain from replacing a solenoid, pressure sensor, transmission or valve body. Replacement will not resolve the fault due a calibration issue pending resolution. Please reset code, and in the event the DTC reoccurs, please contact STAR for further assistance.
68317270A2018-11-26. Service bulletin. POWER TRAIN. 2014 KL 9-Speed service transaxle with 2015 common hardware This 9-speed transaxle must be ordered thru Mopar?s Powertrain Service Center (PSC) for a specific VIN and must be installed in that vehicle or the correct calibration will not load to the Engine Control Module (ECM) and Transmission Control Module (TCM).~ This 9-speed transaxle assembly requires an update to the Engine Control Module AND the Transmission Control Module using WiTech. Failure to complete both updates will result in possible damage and/or incorrect operation of this unit.
68211004A2018-11-26. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. Shifter - Automatic Trans Before this part is replaced for any issue please call John Grzecki on cell (248) 379- 0969. If you do not receive a return call within 15 minutes, proceed with the repair. Please be sure to accurately record any DTCs identified with the scan tool and document them on the repair order.
68090604A2018-11-26. Service bulletin. POWER TRAIN; POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE). Power Transfer Unit Prior to replacing the PTU, please review the following .~ Check if the service 4WD light is intermittent by driving under heavy throttle will produce a C1494-92 DTC, if yes, please call FCA axle engineering and do not replace the PTU. Bruce Michel at cell (248) 260-8641, or Jian Zhu at cell (248) 379- 1132. If neither answers with 15 minutes then proceed with the repair. ~ If the service 4WD light lamp is on steady then replace the Power Transfer Unit.
BJA465972018-06-11. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; POWER TRAIN. Job aid - If you have a suspected TC shudder/vibration, check the Interactive Network for Service Bulletins for the vehicle you are working on. A test-drive snap shot may help you isolate the source of the issue.

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