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Service bulletins for the 2021 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.

1129 on file from NHTSA, as of 2026-10-19.

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By component

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Only bulletins with component: Lighting are shown. Show all

Bulletins, newest first
S21180000152022-10-17. Service bulletin. EXTERIOR LIGHTING. Malfunction Indicator Lamp (MIL) Illumination. Diagnostic Trouble Code (DTC) P0403 ? EGR Control Circuit Open, Set.
14005212022-09-26. Service bulletin. FUEL SYSTEM, GASOLINE; EXTERIOR LIGHTING. Fuel Line Blockage This bulletin involves replacing the engine fuel/EVAP forward line bundle. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find the following Diagnostic Trouble Code (DTC) has been set: P0174 - Fuel System 2/1 Lean. In addition, the customer may notice one or more of the following conditions:Reduced acceleration. Rough starting.
21005212022-09-26. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM; EXTERIOR LIGHTING. Flash: Transmission Control Module (TCM) Updates This bulletin involves reprogramming the TCM with the latest available software. Customers may experience the following on a vehicle with less than 644 km (400 miles) on the odometer: A Malfunction Indicator Lamp (MIL) event or failure withnoDiagnostic Trouble Codes (DTCs) and the vehicle has less than 644 km (400 miles) on the odometer indicates it is likely the vehicle has experienced an unintentional code clear event.Do not use this software update if vehicle odometer has over 644 km (400 miles).
S21230000572022-09-26. Service bulletin. EXTERIOR LIGHTING:TAIL LIGHTS. Tail lamp Is Tight To The Pickup Box In Upper Inboard Corner
S19250000082022-09-26. Service bulletin. EXTERIOR LIGHTING; FUEL SYSTEM, GASOLINE; SERVICE BRAKES, HYDRAULIC. Malfunction Indicator Lamp (MIL) Illumination. Diagnostic Trouble Codes (DTCs) P208B ? Reductant Pump 1 Control Performance, and/or P20E8 ? Reductant Pressure Too Low, Set.
23024222022-09-26. Service bulletin. EXTERIOR LIGHTING:HEADLIGHTS. Headlamp Condensation Clearing Procedure This bulletin is to communicate the procedure for headlamp condensation clearing.
S1823000056RevE2022-09-26. Service bulletin. AIR BAGS; SEATS; VEHICLE SPEED CONTROL; EXTERIOR LIGHTING. Tailgate Ajar Indicator Light Is On And Or High Effort Required To Close And Latch The Tailgate
23021212022-09-26. Service bulletin. EXTERIOR LIGHTING. Incorrect Headlamp Aim This bulletin involves re-aiming the headlamps. The customer may comment on the following:One of the two headlamps is not aimed correctly.
S21080000822022-09-26. Service bulletin. ELECTRICAL SYSTEM; INTERIOR LIGHTING. Interior Lighting Inoperative, Dome, Reading, Glove Box, Center Console, Vanity Lamp, Rambox Lighting
S21180000152022-09-26. Service bulletin. EXTERIOR LIGHTING. Malfunction Indicator Lamp (MIL) Illumination. Diagnostic Trouble Code (DTC) P0403 ? EGR Control Circuit Open, Set.
25001212022-09-26. Service bulletin. FUEL SYSTEM, GASOLINE; EXTERIOR LIGHTING; ELECTRICAL SYSTEM. Dual EVAP System Extreme Duty Vapor Canister Filter Kit This informational bulletin is to make technicians aware that an EVAP dual vapor canister filter kit(Mopar part #68478013AA)is available in place of the OEM single vapor canister filter.This kit should not be installed on vehicles driven in normal conditions that are not subjected to the below symptom/conditions. Customers operating fleet or severe/extreme duty gasoline vehicles in continuous dusty driving conditions can plug the single OE filter system and may experience a Malfunction Indicator Lamp (MIL) illumination. Upon furtherinvestigation the technician may find that the following Diagnostic Trouble Codes (DTCs) have been set:P0441 - EVAP Purge System Performance. P062A - Fuel Pump Control Performance. Customers may also experience the following conditions:Hard to fill fuel tank with fuel. Premature shut-off of the gas nozzle when refueling. Flow back of fuel while refueling.
S2123000009RevA2022-09-26. Service bulletin. EXTERIOR LIGHTING; AIR BAGS. Water is leaking into cab through the third brake light CHMSL
S21230000092022-09-26. Service bulletin. EXTERIOR LIGHTING. Water is leaking into cab through the third brake light CHMSL
08-014-212022-07-18. Service bulletin. ENGINE AND ENGINE COOLING; AIR BAGS; EXTERIOR LIGHTING. Motor Generator Unit (MGU) Connector Not Fully Seated This bulletin involves replacing the MGU. 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). U0594 - Implausible Data Received From HCP. P1B03-00 - Resolver Signal / MCPA Rationality. P0A3F-00 - Drive Motor A Position Sensor 1 Circuit. P0607-00 - ECU Internal Performance. P1C64-00 - Hybrid Perf - Engine Speed Below Target During Autostart. P0A92-00 - Hybrid Generator Performance. Customers may also experience the following: The vehicle has 15-40 minutes of driving time before a vehicle stall.The vehicle will be unable to re-start. The vehicle will lose charging of the main 12V battery. A check engine light and/or a low battery light illuminates.
23021212022-05-31. Service bulletin. EXTERIOR LIGHTING:HEADLIGHTS. Incorrect Headlamp Aim This bulletin involves re-aiming the headlamps. The customer may comment on the following:One of the two headlamps is not aimed correctly.
S2118000015 RevB2022-05-31. Service bulletin. EXTERIOR LIGHTING; ELECTRICAL SYSTEM. Malfunction Indicator Lamp (MIL) Illumination. Diagnostic Trouble Code (DTC) P0403 ? EGR Control Circuit Open, Set.
S21080001172021-06-28. Service bulletin. EXTERIOR LIGHTING. Right Rear Side Marker Parking Lamp Does Not Illuminate
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).
S2018000002 Rev.2021-05-24. Service bulletin. EXTERIOR LIGHTING. Malfunction Indicator Lamp (MIL) Illuminated. Fuel Injection Quantity Diagnostic Trouble Codes (DTCs) Set.
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
09-003-21 REV. A2021-04-26. Service bulletin. EXTERIOR LIGHTING; POWER TRAIN. Transmission Oil Cooler Lines Not Fully Connected This bulletin involves inspecting the Transmission Oil Cooler (TOC) lines and reconnectingif 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.
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.
08-037-212021-04-26. Service bulletin. ELECTRONIC STABILITY CONTROL:AUTOMATIC (ASC); STRUCTURE; ELECTRICAL SYSTEM; BACK OVER PREVENTION; EXTERIOR LIGHTING. Flash: Hybrid Control Processor (HCP) Updates This bulletin involves updating the HCP with the latest available software. Customers 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). P1A26-00 - BPCM Hybrid Battery State Of Charge Performance. P0A7E-00 - Hybrid/EV Battery Pack Over Temperature. U1003-00 - ESP Can C Bus Performance. P2534-00 - Ignition Switch Run/Start Position Circuit Low. P0506 - Idle Speed Performance Lower Than Expected. P0507 - Idle Speed Performance Higher Than Expected. One Trip DTC Changed to a Two Trip DTC.P0AC6-00 - Hybrid/Ev Battery Temperature Sensor 2 Circuit Performance. P0ACB-00 - Hybrid/Ev Battery Temperature Sensor 3 Circuit Performance. U0121-00 - Lost Communication With Anti-Lock Brake System (ABS) Control Module. U0140-00 - Lost Communication With Body Control Module. U1818-00 - Lost Communication With ECM/PCM On D-PT Can. U0100-00 - Lost Communication With ECM/PCM. U0102-00 - Lost Communication With Transfer Case Control Module / AWD. U1003-00 - ESP Can C Bus Performance. P0562 - Battery/System Voltage Low. P060C-00 - Internal Control Module Main Processor Performance. U0415-00 - Implausible Data Received From ABS. U1850-00 - Implausible Data Received From PCM on D-PT. Two Trip DTC Changed to a One Trip DTC.P0E52-00 - DC/DC Converter Current Sensor Circuit A Range/Performance. P0C39-00 - DC/DC Converter Temperature Sensor 1 Performance. P0C3E-00 - DC/DC Converter Temperature Sensor 2 Performance. P0E59-00 - DC/DC Converter Temperature Sensor C Circuit Range/Performance. P0E32-00 - DC/DC Converter Voltage Sensor 1 Performance. P0E37-00 - DC/DC Converter Voltage Sensor 2 Performance. P2C8D-00 - DC/DC Converter Temperature Sensor "D" Circuit Range/Performance. P2535-00 - Ignition Switch Run/Start Position Circuit High. P2534-00 - Ignition Switch Run/Start Position Circuit Low.
18-028-212021-04-26. Service bulletin. FUEL SYSTEM, GASOLINE; EXTERIOR LIGHTING; SERVICE BRAKES, HYDRAULIC; ELECTRICAL SYSTEM; BACK OVER PREVENTION; FUEL SYSTEM, DIESEL; POWER TRAIN; AIR BAGS. Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation, a technician may find one or more of the following Diagnostic Trouble Codes (DTCs) have been set: P0524 - Low oil pressure (during start up in cold ambient temps). P249C-00 - Excessive Time To Enter Closed Loop Reductant Injection Control. P02E8-00 - Diesel Intake Air Flow Position Sensor Circuit Low. P20FB-00 - Reductant Pump 2 Control Performance. P065A-00 - Generator System Performance. P00AF-00 - Turbocharger Boost Control Module "A" Performance. P200A-00 - Intake Manifold Runner Performance - Bank 1. P200B-00 - Intake Manifold Runner Performance - Bank 2. P0106-00 - Manifold Absolute Pressure Sensor Performance. Customers may experience the following:Radio may reset during engine idle. Electronic Throttle Control (ETC) lamp turns on. After a long cold soak a stumble/hesitation is felt during the first few light accelerations. Turbo Surge in park or neutral and high Idle. The cruise control and speed limited set speed doesn?t match the speedometer. It could be up to 2.5 kpm (1.5 mph) difference. Other Software enhancements:Speedometer accuracy improvement(s). Cruise control updates. Battery durability improvements in hot ambient temperatures. Improved idle quality during remote start.

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