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Service bulletins for the 2020 Ram 1500

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.

1228 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

By topic

Bulletins, newest first
742442021-06-28. Service bulletin. POWER TRAIN. Warranty Bulletin D-20-23 Part Order Restriction Program - 48V Power Pack Unit (PPU) - Select 2018 - 2021 Jeep Wrangler (JL) and 2019 - 2021 RAM (DT) (Rev. A)
S2108000007 Rev.2021-06-28. Service bulletin. ELECTRICAL SYSTEM. Increase In Steering Effort After Recent Repairs, DTC?s B210B-00 System Voltage High Or C2129-17 Battery Voltage Circuit Voltage Above Threshold, No Crank, No Start, Stop Start Inoperative
S2108000127 Rev.2021-06-28. Service bulletin. EQUIPMENT. Radio Reboot Continually
S21080001302021-06-28. Service bulletin. EQUIPMENT. Bubbles Or Delamination On The Radio Display
S21080001272021-06-28. Service bulletin. EQUIPMENT. Radio Reboot Continually
S1923000014 Rev.2021-06-28. Service bulletin. LATCHES/LOCKS/LINKAGES. Ram Box Lid Fitment And Or Closing Effort Issues
S21180000092021-06-28. Service bulletin. ENGINE AND ENGINE COOLING. Customer complains of a MIL-on condition. Upon further inspection, there is a Diagnostic Trouble Code (DTC) P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) set in the PCM.
S21080001192021-06-28. Service bulletin. EQUIPMENT. Apple CarPlay Malfunctioning, Does Not Launch Or Is Cutting In An Out On Wired And Wireless Connection, Radio Stuck When IPhone Is Connected
S2008000010 Rev.2021-06-28. Service bulletin. ELECTRICAL SYSTEM. Apple Carplay Inoperative Or Not Working, Phone Not Pairing, Carplay Lockup, Freeze or Audio Concerns
S21230000282021-06-28. Service bulletin. SEATS. Noise From Under Seat With Occupant Seated.
S21080001202021-06-28. Service bulletin. EQUIPMENT. Radio Volume Uncontrollable Or Changing On Its Own
S21230000342021-06-28. Service bulletin. SUSPENSION. C15A1-00 Unable To Obtain Desired Ride Height Service Air Suspension Message On Cluster
S21230000332021-06-28. Service bulletin. SUSPENSION. Underbody Ticking Noise That Increases With Vehicle Speed
S2108000098 Rev.2021-06-28. Service bulletin. EQUIPMENT. Radio Screen Freeze, Blank Screen And Reset
S1809000007 Rev.2021-06-28. Service bulletin. ENGINE AND ENGINE COOLING. Customer Complaint May Include Engine Oil Leak Or Consumption
S21180000062021-06-28. Service bulletin. ELECTRICAL SYSTEM. Malfunction Indicator Lamp (MIL) Illumination. Diagnostic Trouble Code (DTC) P20C6 ? Reductant Heater 4 Control Circuit, Set.
90043822021-06-28. Service bulletin. STRUCTURE. BUSHING, Tailgate Pivot For vehilces built after Dec 1 2020 if the tailgate is making a noise when opening or closing or if the bushing is being replaced for any reason please call FCA Redacted Content. If no response in 15 minutes, proceed with repair. Please take pictures of the inside of the pivot cup after plastic bushing removal and pictures of the pivot post on the box side hinge. Mail pictures to FCA Redacted Content.
9004376 Rev. A2021-06-28. Service bulletin. EQUIPMENT. PUMP, Vacuum Prior to replacing the vacuum pumps, please contact or email FCA Redacted Content. If no response in 15 minutes, proceed with repair.
90043762021-06-28. Service bulletin. EQUIPMENT. PUMP, Vacuum Prior to replacing the vacuum pumps, please contact or email FCA Redacted Content. If no response in 15 minutes, proceed with repair.
08-067-212021-05-24. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM; WHEELS; STEERING; POWER TRAIN; EXTERIOR LIGHTING; AIR BAGS. Flash: Drivetrain Control Module (DTCM) Diagnostic and System Improvements This bulletin involves reprogramming the DTCM with the latest available software. The technician may find one or more of the following DTCs:U1440 - Implausible Transfer Case Ratio High Received. U0403-00 - Implausible Data Received From T-case. C1403-92 - Transfer Case Range Position Sensor-Performance Or Incorrect Operation(2019-2020 Vehicles Only). If only DTC C1403 is present, follow normal diagnostic procedures before updatingthe DTCM.In addition the customer may describe one or more of the following:Traction Control System light is illuminated. A driveline bump can be heard/felt occasionally when the driver is steady on the throttle at about 20-30% on a flat road while in 4WDAUTO(2019-2020 Vehicles Only). An excessive electric motor clicking sound from the middle of the vehicle/transfer case area, when on and off the throttle(2019-2020 Vehicles Only). An excessive electric motor clicking sound with steering wheel movement, most notable in parking lot or low speed maneuvering(2019-2020 Vehicles Only). A ?Service 4WD? message/fault without commanding a transfer case shift(2019-2020 Vehicles Only).If only the ?Service 4WD? message/fault is displayed in the Instrument Panel Cluster (IPC) and no other symptom/conditionsare present, follow normal diagnostic procedures before updating the DTCM(2019-2020 Vehicles Only). The blinking of the ?4WD Low? and ?4WD High? indicator lights at the same time, on the transfer case selector switch.If both 4WD indicator lights on the transfer case selector switch are blinking and no other symptom/conditions are present,follow normal diagnostic procedures before updating the DTCM(2019-2020 Vehicles Only). During highway/freeway speeds, a bump in the driveline may be felt. This could also be described as a harsh transmission shift(2019-2020 Vehicles Only).
08-055-21 REV. A2021-05-24. Service bulletin. EQUIPMENT:ELECTRICAL. Key FOBIK Shortage and Restriction This bulletin is to inform customers, FOBIKs will be on restriction due to a temporary semi conductor shortage. Key FOBIKs to service customer vehicles are limited to customer vehicles which are inoperable and a spare FOBIK is not available.
23-016-212021-05-24. Service bulletin. STRUCTURE:BODY:ROOF AND PILLARS. Water Leaks At Sliding Backlite This bulletin involves inspecting and if needed replacing the rear sliding backlite if leaking. The customer may comment on the following: Water leaks from the cab back, evident on rear seats, carpet, and potentiallyroof.
08-055-212021-05-24. Service bulletin. EQUIPMENT. Key FOBIK Shortage and Restriction This bulletin is to inform customers, technicians and sales staff that vehicles are being delivered with only one key FOBIK due to a temporary semi conductor shortage. The customer may notice that they only have one key FOBIK when the vehicle was delivered or need an additional key FOBIK due to a lost or damaged keyFOBIK.Key FOBIKs to service customer vehicles are limited to customer vehicles which are inoperable and a spare FOBIK is not available.
S21080000982021-05-24. Service bulletin. EQUIPMENT:APPLIANCE:TV/RADIO/SPEAKERS. Radio Screen Freeze, Blank Screen And Reset
S21180000042021-05-24. Service bulletin. BACK OVER PREVENTION; EXTERIOR LIGHTING. Malfunction Indicator Lamp (MIL) Illumination. Diagnostic Trouble Codes (DTCs) P225D ? NOX Sensor 1/1 Performance, Signal Stuck Low And/Or P225C ? NOX Sensor 1/1 Performance, Signal Stuck High, Set.

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