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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
02002202022-10-17. Service bulletin. SUSPENSION; WHEELS; STEERING. Steering Wheel Off Center This bulletin involves adjusting the front toe to correct a steering wheel off center condition. This is due to an inaccurate alignment settings from the plant. The customer may describe the steering wheel is off center.
08094202022-10-17. Service bulletin. EXTERIOR LIGHTING; ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. Flash: Drivetrain Control Module (DTCM) Update This bulletin involves reprogramming the DTCM with the latest available software. The customer may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find the following Diagnostic Trouble Code (DTC) has been set::If the customer has any concerns with the transfer case or if the tech performs any repairs on the transfer case, the software must be updated.C140E - Transfer Case Motor Blocked. If DTC C140E is present, follow normal diagnostic procedures before updating the DTCM.In addition the customer may describe the following:The ?Service 4WD? message/fault is displayed in the Instrument Panel Cluster (IPC). Transfer case shift fork tabs broken during range shift. Noisy (clunking/ratcheting) transfer case range shifts. Failure to complete transfer case range shifts. The following software enhancement is available:This update will help reduce premature transfer case failure.
03002202022-10-17. Service bulletin. BACK OVER PREVENTION. Front Axle Noise While in 4WD Mode This bulletin involves replacing the front axle assembly. The customer may experience a growling noise from the front axle which is more noticeable at lower speeds in 4WD mode.
S1808000221RevB2022-10-17. Service bulletin. EQUIPMENT:ELECTRICAL. Cluster Does Not Retain Selected Radio Theme Update
S20240000072022-10-17. Service bulletin. ENGINE AND ENGINE COOLING. Customer Indicates There Is A Whistle Noise After The Vehicle Is Turned Off.
S20080001652022-10-17. Service bulletin. EQUIPMENT:ELECTRICAL. Cannot Program Newly Installed Mopar Remote Start, Key Programming Fails, Keys Already Programmed Failing Response
S20080001592022-10-17. Service bulletin. ENGINE. CEL (Check Engine Lamp) On, Slightly Higher Than Expected Idle
S1923000014RevC2022-10-17. Service bulletin. EQUIPMENT. Ram Box Lid Fitment And Or Closing Effort Issues
S1918000013RevA2022-10-17. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:CRANK/CAMSHAFT POSITION SENSOR. No Crank No Start Condition. P0688 - Auto Shutdown Relay Sense Circuit Low Found In The PCM
S20080001512022-10-17. Service bulletin. ELECTRICAL SYSTEM. Outside Air Temperature Displayed On Cluster Or Radio Are Inaccurate
90043082022-10-17. Service bulletin. EQUIPMENT. COVER, Tonneau If the tonneau retaining strap is broken, there is a repair strap available. It is not necessary to replace the full tonneau cover.
08144222022-10-17. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN. 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: C1415-92 - Transfer Case Motor Current-Performance or Incorrect Operation. 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 updating the 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 4WD AUTO(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/conditions are 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).
S1908000193RevA2022-10-17. Service bulletin. STRUCTURE:BODY:TAILGATE; ELECTRICAL SYSTEM. The Tailgate Ajar Warning Lamp Does Not Illuminate
S22080001382022-10-17. Service bulletin. ELECTRICAL SYSTEM. Decreased Remote Start And RKE Range. Tire Pressure Sensors Values Are Not Displayed
D19022022-10-17. Service bulletin. ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM). Fast Feedback Program - 6.7L Cummins Engine - 2019 & 2020 HD Ram & 6.7L Cummins Diesel Engine Control Module (ECM) - 2018 Ram- All Models (Rev. E)
S20080000942022-10-17. Service bulletin. EQUIPMENT:ELECTRICAL. Uconnect Market Place APP Fatal Error Message
S20080000932022-10-17. Service bulletin. LANE DEPARTURE: BLIND SPOT DETECTION. Blind Spot Or Park Assist Warnings, False Activation
S20080000902022-10-17. Service bulletin. VISIBILITY. The Passenger Exterior Mirror Does Not Auto Dim
S20080000892022-10-17. Service bulletin. ELECTRICAL SYSTEM. SGW (Security Gateway Module) Setting DTC B235A-00 ECU In-Plant- Mode
S20180000082022-10-17. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM. Engine Surge Feel and/or Diagnostic Trouble Code P0299 ? Turbo Underboost Condition After Updating The Powertrain Control Module (PCM) Software. (ETL, ETM, ETN Engines)
S19080000472022-10-17. Service bulletin. EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. Volume Uncontrollable Or Stuck On High
S19080001702022-10-17. Service bulletin. EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. Radio Screen Black At Vehicle Startup After A Sleep Cycle
S19080001742022-10-17. Service bulletin. EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. Radio Screen Black At Vehicle Startup After A Sleep Cycle
S19080001022022-10-17. Service bulletin. EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. Audio Mute On All Sources Except AM
S20250000052022-10-17. Service bulletin. ELECTRICAL SYSTEM. Malfunction Indicator Lamp (MIL) Illumination. Diagnostic Trouble Codes P0407 ? EGR Sensor B Circuit Low, or P0408 ? EGR Sensor B Circuit High Set

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