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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.

By type

By component

By trouble code

By topic

Only bulletins with component: Electrical system are shown. Show all

Bulletins, newest first
0808621REVA2022-09-26. Service bulletin. ELECTRICAL SYSTEM. Flash: Driver Door Module (DDM) and Passenger Door Module (PDM) Updates This bulletin involves reprogramming the DDM and PDM with the latest available software. Customers may notice: Exterior mirrors do not return to the original position after shifting out of reverse gear. Exterior mirrors continue to tilt downwards even after shifting out of reverse gear. For vehicles on the RRT VIN List this software is to improve the function and reliability of the power windows operation.
23022212022-09-26. Service bulletin. ELECTRICAL SYSTEM. External AC Power Outlet Detaches From the Bezel This bulletin involves inspecting if the external AC power outlet is loose in the frame and repairing if needed Customers may comment on the following: The external AC power outlet is loose in the frame. AC power outlet Detached From Frame/Bezel1 - AC power outlet2 - Outlet Frame
08098212022-09-26. Service bulletin. ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:ADAS:PARKING ASSIST:SENSORS; ELECTRICAL SYSTEM:ADAS:PARKING ASSIST:SOFTWARE. Flash: Park Assist Module (PAM) Enhancement This bulletin involves updating the PAM software with the latest available software. Customers may comment on the following condition:False braking alerts while backing up when there?s nothing behind the vehicle.
S21080001342022-09-26. Service bulletin. ELECTRICAL SYSTEM. MIL (Malfunction Indicator Lamp) Illuminated, ETC (Electronic Throttle Control) Lamp Flashing
S21080001332022-09-26. Service bulletin. ELECTRICAL SYSTEM:STARTER ASSEMBLY. No Start, Battery Lamp And MIL Lamp On, Stop Start Inoperative
08067212022-09-26. Service bulletin. ENGINE AND ENGINE COOLING; POWER TRAIN; ELECTRICAL SYSTEM. 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).
08055212022-09-26. Service bulletin. ELECTRICAL SYSTEM:IGNITION:ANTI-THEFT:IMMOBILIZER/PROXIMITY:KEY/SENDER. 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.
S21080000982022-09-26. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. Radio Screen Freeze, Blank Screen And Reset
S21180000042022-09-26. Service bulletin. ELECTRICAL SYSTEM. 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.
S20180000022022-09-26. Service bulletin. ELECTRICAL SYSTEM. Malfunction Indicator Lamp (MIL) Illuminated. Fuel Injection Quantity Diagnostic Trouble Codes (DTCs) Set.
S21080001042022-09-26. Service bulletin. ELECTRICAL SYSTEM. No Start, On Stop Start Vehicles A MIL Lamp On With DTC P0A97 Combined With The No Start
S21230000252022-09-26. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. HUD Heads Up Display Appears Blurry Or Double Image
S21080001002022-09-26. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM; FUEL SYSTEM, GASOLINE. CEL (Check Engine Lamp) Lamp On, Crank No Start, DTC U0109, U016C Lost Communications With Fuel Pump Module
S21080000872022-09-26. Service bulletin. ELECTRICAL SYSTEM. CEL (Check Engine Lamp) On, Stop Start Inoperative, DTC B25C9 Driver Door Ajar Switch 2 Stuck Closed
S20080001132022-09-26. Service bulletin. ELECTRICAL SYSTEM. No Start Intermittently, Vehicle Requires Multiple Keyless Push To Start Attempts To Start Vehicle, Intermittent Key Not Detected Message
S16080002262022-09-26. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. Battery Tester Warranty Code Procedures, Midtronics Charger Update Process
S160800022612022-09-26. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. Battery Tester Warranty Code Procedures, Medtronic Update Process
S21080000712022-09-26. Service bulletin. ELECTRICAL SYSTEM. Cluster Displays Service Active Dampening System Message, DTC B2286 Calibration Not Learned ? Lost Calibration
S21180000032022-09-26. Service bulletin. ELECTRICAL SYSTEM. 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
S2108000071A2022-09-26. Service bulletin. ELECTRICAL SYSTEM. Cluster Displays Service Active Dampening System Message, DTC B2286 Calibration Not Learned ? Lost Calibration
S21080000932022-09-26. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. Apple CarPlay Does Not Work Or Not Connecting
08047212022-09-26. Service bulletin. ELECTRICAL SYSTEM. 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.
08042212022-09-26. Service bulletin. ELECTRICAL SYSTEM. Flash: Body Control Module (BCM) Updates This bulletin involves updating the BCM with the latest available software. Customer may comment that the hill descent button is inoperative.
08037212022-09-26. Service bulletin. ELECTRICAL SYSTEM. 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.
18028212022-09-26. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM. 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.