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Service bulletins for the 2021 Ram 4500

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.

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

By type

By component

By trouble code

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

Bulletins, newest first
18017232024-01-02. Service bulletin. POWER TRAIN; BACK OVER PREVENTION; ELECTRICAL SYSTEM; AIR BAGS. Flash: Powertrain Control Module (PCM) Updates Customer or technician may experience the following: ? High frequency exhaust noise at idle after cold start. ? Power Take Off (PTO) disable to high engine oil temperature. ? Multiple Displacement System (MDS) transition causing a transmission clunk noise under light throttle when coasting in fourth gear. This bulletin involves reprogramming the PCM with the latest available software.
S228A0000282024-01-02. Service bulletin. ELECTRICAL SYSTEM. Radio Remained On After Ignition Is Switched Off, Dead Battery From Excessive Radio Current Draw
91002262023-10-30. Service bulletin. ELECTRICAL SYSTEM:WIRING. Connector kit Before ordering this connector repair kit 68018957A$, check it in the Mopar Connector Repair Kit Website to confirm part number and applicability. There is an error with the wiring diagrams in Service Library that is causing the incorrect repair kit part number to populate. Please use the Mopar Connector Repair Kit Website until this issue is resolved.
08181232023-09-25. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. Radio Over The Air Updating to QR40.12 Software Version ? Mobile Wi-Fi inoperative upon start up. ? Hotspot gives "No Internet" connection message on phone, when trying to connect to a device. This bulletin provides information regarding the latest Firmware Over The Air (FOTA) update and provides the service technician an overview of the steps a customer will need to take to complete the update. The radio software will be updated from QR39.62 and QR39.57 to QR40.12. NOTE: National launch for this FOTA update is expected to begin August 16, 2023
S238A0000342023-09-25. Service bulletin. ELECTRICAL SYSTEM:WIRING:CONNECTORS/PLUGS:ACCESORY POWER OUTLET/JACK/PORT/USB/SAE/CIGARETTE LIGHTER. USB Hub In-Operable
18078232023-08-21. Service bulletin. POWER TRAIN:MANUAL TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); POWER TRAIN. Flash: Powertrain Control Module (PCM) Updates Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation, a technician may find one or more of the following DTCs have been set: ? U0418-00 - Implausible Data Received From Brake System Control Module 1. ? P061A - Level 2 Torque Performance. Customers may also experience the following: ? **Driveline bumps and rumbles when lightly applying the accelerator pedal in traffic or at other low vehicle speeds such as parking lot maneuvers.** ? Transmission hard upshifts, rough/bump during low gear 1-2 and 2-3 at 40-64 kph (25-40 mph). This bulletin involves reprogramming the PCM with the latest available software.
ReferenceZD72023-08-21. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. Customer Satisfaction Notification ZD7 - Radio Software Update
BulletinA2023-07-31. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. Customer Satisfaction Notification ZD7 - Radio Software Update
08129232023-07-31. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.; UNKNOWN OR OTHER. Radio Over The Air Updating from PR39.92 to PR40.12 Software Version ? Radio Wi-Fi Hotspot connection not working. This bulletin provides information regarding the latest Firmware Over The Air (FOTA) update and provides the service technician an overview of the steps a customer will need to take to complete the update. The radio software will be updated from PR39.92 to PR40.12. NOTE: National launch for this FOTA update is expected to begin June 23, 2023.
14003232023-05-30. Service bulletin. ELECTRICAL SYSTEM. Diesel Exhaust Fluid (DEF) Fluid Freezing 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: ? P203E-00 - Reductant Level Sensor 1 Circuit Intermittent-Erratic. This bulletin involves replacing the urea delivery module and grade vent valve and updating the Dosing Control Unit (DCU) software.
S22080000802023-05-30. Service bulletin. ELECTRICAL SYSTEM. Ambient Air Temperature Missing, Malfunction Indicator Lamp (MIL) Lamp On, Diagnostic Trouble Code (DTC) P0070-15 Ambient Air Temperature Sensor Circuit-Circuit Short to Battery or Open, P0073 Ambient Air Temperature Sensor Circuit High
S22230000632023-05-30. Service bulletin. ELECTRICAL SYSTEM. Ambient Temperature Sensor Servicing.
08064232023-04-17. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. Radio Over The Air Updating to QR40.12 Software Version Mobile Wi-Fi inoperative upon start up. ? Hotspot gives 9No Internet9 connection message on phone, when trying to connect to a device. This bulletin provides information regarding the latest Firmware Over The Air (FOTA) update and provides the service technician an overview of the steps a customer will need to take to complete the update. The radio software will be updated from QR39.7 to QR40.12. NOTE: National launch for this FOTA update is expected to begin March 10, 2023. DISCUSSION: Vehicles sold in the U.S. and Canada can now receive software updates ?over-the-air?. Updates to software will occur in a phased roll-out. The software is updated through the built-in cellular modem in the radio.
18017232023-04-17. Service bulletin. BACK OVER PREVENTION; AIR BAGS; POWER TRAIN; ELECTRICAL SYSTEM. Flash: Powertrain Control Module (PCM) Updates Customer or technician may experience the following: ? High frequency exhaust noise at idle after cold start. ? Power Take Off (PTO) disable to high engine oil temperature. ? Multiple Displacement System (MDS) transition causing a transmission clunk noise under light throttle when coasting in fourth gear. This bulletin involves reprogramming the PCM with the latest available software.
S228A0000282023-04-17. Service bulletin. ELECTRICAL SYSTEM. Radio Remained On After Ignition Is Switched Off, Dead Battery From Excessive Radio Current Draw
S14080003842023-04-17. Service bulletin. ELECTRICAL SYSTEM. Start Stop Charging Warning Lamp Illuminated On, Intelligent Battery Sensor (IBS) State of Charge (SOC) Inaccurate, Battery Charging Message, Presence of IBS related Diagnostic Trouble Codes (DTCs), or Battery Warning Lamp On
91000082023-01-17. Service bulletin. ELECTRICAL SYSTEM. Telematic box module 2
18127222023-01-17. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN. Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Engine Control Module (ECM) / Powertrain Control Module (PCM) with the latest available software. PCM software related to this Technical Service Bulletin (TSB) is included within the Y43 Recall. If not already completed, please perform the Y43 recall if the vehicle is on the recall VIN list. For all other vehicles perform the Repair Procedure below. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or more of the following Diagnostic Trouble Codes (DTCs) have been set: P0607-00 - ECU Internal Performance. P0299-00 - Turbocharger Underboost. P1451-00 - Diesel Particulate Filter System Performance. The following improvements are also included in this update: Idle stability improvement. Fuel system run-up test routine, wiTECH improvement. Aftertreatment system performance test routine, wiTECH improvement. Power Take Off (PTO) system improvements. Enabling Estop for split shaft PTO systems. Oil pressure switch modifications. Urea (DEF fluid) level sensor calibration update, to help prevent bumps in DEF level gauge.
S21080001632023-01-17. Service bulletin. ELECTRICAL SYSTEM. No Start, Cannot Complete Module Replace, Proxi Or Module Proxi Configuration
08082212023-01-17. Service bulletin. STRUCTURE; ELECTRICAL SYSTEM. Flash: Body Control Module (BCM) Diagnostic and System Improvements This bulletin involves reprogramming the BCM with the latest available software. The customer may describe the following: The shifter gets stuck in park.
08072212023-01-17. Service bulletin. VISIBILITY:POWER WINDOW DEVICES AND CONTROLS; 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. This software is for vehicles on the RRT VIN List is to improve the function and reliability of the power windows operation.
S2008000186REVA2023-01-09. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM); ELECTRICAL SYSTEM. Engine Control Module (ECM) Flash Failure, Diagnostic Trouble Code (DTC) U1601 ? ECU Application Software Code 1 Missing Or Corrupted
S2208000080RevA2023-01-09. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM; ELECTRICAL SYSTEM. Ambient Air Temperature Missing, Malfunction Indicator Lamp (MIL) Lamp On, Diagnostic Trouble Code (DTC) P0070-15 Ambient Air Temperature Sensor Circuit-Circuit Short to Battery or Open, P0073 Ambient Air Temperature Sensor Circuit High
S22080000802023-01-09. Service bulletin. BACK OVER PREVENTION; ELECTRICAL SYSTEM. Ambient Air Temperature Missing, MIL Lamp On, DTC P0070-15 Ambient Air Temperature Sensor Circuit-Circuit Short to Battery or Open; P0073 Ambient Air Temperature Sensor Circuit High
S22080000112023-01-09. Service bulletin. ELECTRICAL SYSTEM:PROPULSION SYSTEM:CHARGING:CABLE/CORD:ACCESSORY; EQUIPMENT:ELECTRICAL:WIRELESS CHARGER/CRADLE. Wireless Qi Charger Not Charging

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