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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
S21240000032021-05-24. Service bulletin. AIR BAGS. A/C Performance Not As Hot/Cold On Driver Side - DTC's B11CB-92, B11CB-11
S2018000002 Rev.2021-05-24. Service bulletin. EXTERIOR LIGHTING. Malfunction Indicator Lamp (MIL) Illuminated. Fuel Injection Quantity Diagnostic Trouble Codes (DTCs) Set.
S1818000024 Rev.2021-05-24. Service bulletin. FUEL SYSTEM, GASOLINE. Diesel Fuel Injector Cleaning Procedure
S21080001042021-05-24. Service bulletin. POWER TRAIN. No Start, On Stop Start Vehicles A MIL Lamp On With DTC P0A97 Combined With The No Start
S1708000118 Rev.2021-05-24. Service bulletin. EQUIPMENT:ELECTRICAL. Battery Drain Concern, Dual USB Port Normal Operational Draw, Extended Illumination After Key Off
S21080000872021-05-24. Service bulletin. VEHICLE SPEED CONTROL; AIR BAGS; ELECTRICAL SYSTEM. CEL (Check Engine Lamp) On, Stop Start Inoperative, DTC B25C9 Driver Door Ajar Switch 2 Stuck Closed
S21080000992021-05-24. Service bulletin. INTERIOR LIGHTING. CEL (Check Engine Lamp) Lamp On, No Apparent Drivability Complaints
S1924000019 Rev.2021-05-24. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION:PRESSURE/TEMPERATURE SENSOR. Customer Indicates That Temperature Varies From Side To Side Being Colder On One Side Compared To The Other.
S2008000113 Rev.2021-05-24. Service bulletin. POWER TRAIN. No Start Intermittently, Vehicle Requires Multiple Keyless Push To Start Attempts To Start Vehicle, Intermittent Key Not Detected Message
S21080000632021-05-24. Service bulletin. LANE DEPARTURE. Crank No Start, Cluster Warning Lamps Flash On And Remain On At Start Up, Wipers Turn On Stay On
S2023000024 Rev.2021-05-24. Service bulletin. STRUCTURE. Water Leak Rear Of Cab Rear Seat Or Headliner
S21180000032021-05-24. Service bulletin. ELECTRICAL SYSTEM; BACK OVER PREVENTION; SERVICE BRAKES; EXTERIOR LIGHTING. Malfunction Indicator Lamp (MIL) Illumination. Diagnostic Trouble Codes (DTCs) P051B ? Crankcase Pressure Sensor Circuit Performance, and/or P04DB ? Crankcase Ventilation System Disconnected, Set After Powertrain Control Module (PCM) Replacement
S21080000932021-05-24. Service bulletin. BACK OVER PREVENTION:DISPLAY FUNCTION; EQUIPMENT. Apple CarPlay Does Not Work Or Not Connecting
S2023000049 Rev.2021-05-24. Service bulletin. VISIBILITY. Driver And/Or Passenger Exterior Mirror Glass Intermittently Does Not Return To Original Position From Tilt Down Or Appears Stuck In Down Position
S1823000029 Rev.2021-05-24. Service bulletin. STRUCTURE. Water Leak Carpet Wet At Front And Or Rear Seats
9004365 Rev. A2021-05-24. Service bulletin. EQUIPMENT. TRANSMITTER, Integrated Key Fob (Cut and Uncut) Due to a global semiconductor shortage, service availability of this part is limited. To maintain production and service requirements, FOBIKs affected by the shortage will be available on an ?as required basis?. This FOBIK should only be ordered in the event the vehicle is inoperable, and there are no other FOBIKs available. It is requested the customer uses their spare FOBIK until supply is once again available.
90043652021-05-24. Service bulletin. EQUIPMENT. TRANSMITTER, Integrated Key Fob (Cut and Uncut) Due to a global semiconductor shortage, service availability of this part is limited. To maintain production and service requirements, FOBIKs affected by the shortage will be available on an ?as required basis?. This FOBIK should only be ordered in the event the vehicle is inoperable, and there are no other FOBIKs available. It is requested the customer uses their spare FOBIK until supply is once again available. On some 2021 vehicles, they will be sold with only one FOBIK, and will have sales code ?GXZ?. For these vehicles a CSN (Customer Satisfaction Notification) will be released to replace the FOBIK once supply is available. A unique part number will be used for this campaign. For these vehicles, only order a replacement FOBIK in a vehicle down situation. Due to the global shortage, once service inventory of this part is depleted, there may not be any additional parts available for service for an extended period of time. This may cause customer dissatisfaction and extended vehicle down time. We appreciate everyone?s consideration and cooperation to only order this part in a vehicle down situation.
09-003-212021-04-26. Service bulletin. POWER TRAIN; EXTERIOR LIGHTING. Transmission Oil Cooler Lines Not Fully Connected This bulletin involves inspecting the Transmission Oil Cooler (TOC) lines and reconnecting if necessary. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more ofthe following Diagnostic Trouble Codes (DTCs). P1D90-00 Incorrect Gear Ratio - Clutch 2 Defective. P1D91-00 Incorrect Gear Ratio - Clutch 3 Defective. P1D92-00 Incorrect Gear Ratio - Clutch 4 Defective. P1D93-00 Incorrect Gear Ratio - Clutch 5 Defective. P1D95-00 Tcm Clutch Failure Undetermined. P1B14-00 Park-By-Wire - Unintended Park Position. P1B13-00 Park-By-Wire - Unintended Out Of Park Position. P1D99-00 Incorrect Gear Ratio: Clutch B Or E Defective. P1D9A-00 Incorrect Gear Ratio: Clutch C Or D Defective. P1D95-00 Tcm Clutch Failure Undetermined. P07E4-00 Unable To Engage Park. P1DCD-00 Tcm Monitoring Processor Performance - Multiple Clutches Locked Up. P0735-00 Gear 5 Shift Incorrect Ratio. P0919-00 Gear Shift Position Control Error. Customers may also experience the following:Transmission fluid leaking under vehicle. The vehicle will not shift. Slow shifting between gears.
08-047-212021-04-26. Service bulletin. ELECTRICAL SYSTEM; EXTERIOR LIGHTING; VEHICLE SPEED CONTROL; VISIBILITY. Door Control Module Window Inoperative This bulletin involves replacing one or both of the door modules. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or moreof the following Diagnostic Trouble Codes (DTCs) have been set: B18BA-12 - Window Control - Circuit Short to Battery B18BA-13 - Window Control - Circuit Open In addition the customer may notice one or more of the following:Driver and/or passenger windows stop working. If window switch is held in the up position for two seconds the obstructionautodown function, may not work. Windows may go up slower than expected.
23-012-212021-04-26. Service bulletin. VEHICLE SPEED CONTROL; AIR BAGS; SEAT BELTS. Driver Side Rambox Opens By Itself Unprompted This bulletin involves removing the driver side Rambox and replacing the Rambox door lock actuator wiring harness with a jumper wiring harness. The customer may comment on one or more of the following:Every time the vehicle is unlocked the driver side Rambox opens. Driver side Rambox opens for no reason.This can happen while the vehicle is sitting over night, or if the vehicle is left unlocked.
08-041-212021-04-26. Service bulletin. PARKING BRAKE; STRUCTURE; ELECTRICAL SYSTEM. Flash: Body Control Module (BCM) Updates This bulletin involves updating the BCM with the latest available software. Customer may comment that after pressing the remote start button twice on the key FOB, vehicle will chirp once, and fail to initiate remote start.This issue may be accompanied by a low voltage remote start inhibit monitor.
23-011-212021-04-26. Service bulletin. STRUCTURE:BODY:TAILGATE. Tailgate High Closing Effort This bulletin involves installing a tailgate pivot cup shim. The customer may comment that tailgate is difficult to open/close.
W95 Combo2021-04-26. Service bulletin. SUSPENSION. Customer Satisfaction Notification W95 Built to Serve 1" Lift Springs
S1723000007 Rev.2021-04-26. Service bulletin. SUSPENSION. Air Suspension Inoperative And Or Compressor Freeze Up Or Sticking In Cold Weather.
S1723000001 Rev.2021-04-26. Service bulletin. VISIBILITY. Left Hand Drivers Side Mirror Takes Longer to Defrost Or Clear Than Right Side Passenger

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