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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.

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

Bulletins, newest first
S1708000118 RevB2022-05-31. Service bulletin. ELECTRICAL SYSTEM. Battery Drain Concern, Dual USB Port Normal Operational Draw, Extended Illumination Or Extended Operation After Key Off
S22080000682022-05-31. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. ?Device Not Supported? Message on the radio screen
08-119-21 REV. A2021-12-13. Service bulletin. ELECTRICAL SYSTEM. UAX, UCX, UAV and UCV Radio Over the Air Software Version Updates This bulletin provides information regarding the latest Flash 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 to:DT with UAX and UCX - Current software 34.2RM will be update to 34.31FRM. All other vehicles and radio combinations - 34.2. The national launch for the FOTA will begin July 21, 2021. Customers may experience one or more of the following: SOS, Automatic SOS (ASOS) , assist calls not showing correct location(DT Vehicles with UAX and UCX Only). GPS inaccuracies(DT Vehicles with UAX or UCX Only). Uconnect radio apps are inoperable(DT Vehicles with UAX or UCX Only). SXM® button are greyed out(DT Vehicles with UAX or UCX Only). Intermittently, SXM loading screen is stuck(DT Vehicles with UAX or UCX Only). Uconnect App inoperative(DT Vehicles Only). Voice Recognition (VR) inoperative(DT Vehicles Only). Radio resets(DT Vehicles Only). Radio locks up, freezes or resets. Bluetooth device is slow to pair, or does not pair. GPS unable to load and find locations. Loss of saved radio presets. Display screen is back with no backlighting. No audio output coming from the radio. Cannot control audio volume. Rear view camera display will not turn off.
08-137-21 REV. B2021-12-13. Service bulletin. ELECTRICAL SYSTEM; STEERING. Flash: Electric Power Steering (EPS) Module Updates This bulletin involves updating the EPS module with the latest available software. Customers may experience the following:Vibration felt or noise heard when turning right at low speeds.
08-137-21 REV. A2021-12-13. Service bulletin. STEERING; ELECTRICAL SYSTEM. Flash: Electric Power Steering (EPS) Module Updates This bulletin involves updating the EPS module with the latest available software. Customers may experience the following: Vibration felt or noise heard when turning right at low speeds.
18-008-21 REV. A2021-06-28. Service bulletin. 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 the technician may find that one or more of the following DTCs have been set: P225D-00 - Nox Sensor 1/1 Performance - Signal Stuck Low. P249C-00 - Excessive Time To Enter Closed Loop Reductant Injection Control. P065A - Generator System Performance. P00F4-00 - Humidity Sensor Circuit Low. Improved VGT cleaning to reduce false failures for P00AF field issue. P0106-00 - Manifold Absolute Pressure Sensor Performance. P20FB-00 - Reductant Pump 2 Control Performance. P200A-00 - Intake Manifold Runner Performance - Bank 1. P200B-00 - Intake Manifold Runner Performance - Bank 2. P2610 - PCM Internal Engine Off Timer Performance. Change DTC number from P0101-00 to P0109-00 - Mass Air Flow Sensor Performance. P015E - Excessive Time to Enter Closed Loop Fuel Timing Control. P0534-00 - AC Refrigerant System A Charge Loss. P26FB-00 - EGR Cooler Bypass Control Stuck Closed Bank 1. P04DB-00 - Crankcase Ventilation System Disconnected. P204F-00 - Reductant System Performance. P2D2D-00 - Cold Start Intake Manifold Runner Performance Bank 1. P2D2E-00 - Cold Start Intake Manifold Runner Performance Bank 2. P2199-00 - Intake Air Temperature Sensor 1 / 2 Correlation. P22FA-00 - NOX Sensor Performance - Slow Response High To Low Bank 1 Sensor 1. P2002-00 - Diesel Particulate Filter Efficiency Below Threshold. P0087-00 - Fuel Rail Pressure Too Low. P0128-00 - Thermostat Rationality(additional software enhancement). P0300-00 - Multiple Cylinder Misfire(cold ambient temperature). P0301-00 - Cylinder 1 Misfire(cold ambient temperature). P0302-00 - Cylinder 2 Misfire(cold ambient temperature). P0303-00 - Cylinder 3 Misfire(cold ambient temperature). P0304-00 - Cylinder 4 Misfire(cold ambient temperature). P0305-00 - Cylinder 5 Misfire(cold ambient temperature).
S2108000007 Rev.2021-06-28. Service bulletin. ELECTRICAL SYSTEM. Increase In Steering Effort After Recent Repairs, DTC?s B210B-00 System Voltage High Or C2129-17 Battery Voltage Circuit Voltage Above Threshold, No Crank, No Start, Stop Start Inoperative
S2008000010 Rev.2021-06-28. Service bulletin. ELECTRICAL SYSTEM. Apple Carplay Inoperative Or Not Working, Phone Not Pairing, Carplay Lockup, Freeze or Audio Concerns
S21180000062021-06-28. Service bulletin. ELECTRICAL SYSTEM. Malfunction Indicator Lamp (MIL) Illumination. Diagnostic Trouble Code (DTC) P20C6 ? Reductant Heater 4 Control Circuit, Set.
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).
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
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
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.
08-041-212021-04-26. 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.
S2008000126 Rev.2021-04-26. Service bulletin. ELECTRICAL SYSTEM. RKE Has Reduced Range, Remote Start Inoperative, Multiple Keyless Go Push Attempts To Start, Key Not Detected Message, Tire Pressure Warning Lamp On
S2108000060 Rev.2021-04-26. Service bulletin. ELECTRICAL SYSTEM. Service Park Assist Message Or Rear Park Assist Unavailable Message Displaying On The Cluster
S21080000602021-04-26. Service bulletin. ELECTRICAL SYSTEM. Service Park Assist Message Or Rear Park Assist Unavailable Message Displaying On The Cluster
S21080000522021-03-15. Service bulletin. SEATS:FRONT ASSEMBLY:SEAT HEATER/COOLER; ELECTRICAL SYSTEM. Heated Seat LED Indicator Turns On And Back Off. One Or More Heated Seat DTC?s
S210800000492021-03-15. Service bulletin. EQUIPMENT; VISIBILITY:WINDSHIELD WIPER/WASHER; ELECTRICAL SYSTEM:INTERIOR LAMPS/BULBS. Windshield Washer Fluid Pump Does Not Function. Interior Rear Dome, Vanity And Glove Box Lamps Do Not Illuminate
S2008000126 Rev.2021-03-15. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT; ENGINE AND ENGINE COOLING. RKE Has Reduced Range, Remote Start Inoperative, Multiple Keyless Go Push Attempts To Start, Key Not Detected Message
S21080000392021-03-15. Service bulletin. BACK OVER PREVENTION; ELECTRICAL SYSTEM. Back Up Camera Inoperative Complaints, Radio Display Blue Or Blank When Placed In Reverse
S2008000041 Rev.2021-03-15. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:APPLIANCE:TV/RADIO/SPEAKERS. Device Not Supported Message On Radio Screen
18-062-20 REV. A2021-03-01. Service bulletin. ENGINE; ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). 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 the technician may find that the one or more of the following DTCs have been set:P0300 - Multiple Cylinder Misfire. P0301 - Cylinder 1 Misfire. P0302 - Cylinder 2 Misfire. P0303 - Cylinder 3 Misfire. P0304 - Cylinder 4 Misfire. P0305 - Cylinder 5 Misfire. P0306 - Cylinder 6 Misfire. P0307 - Cylinder 7 Misfire. P0308 - Cylinder 8 Misfire. The customer may experience one or more of the following:Rough idle/misfire only after cold start ECO light does not illuminate in the cluster when Multiple Displacement System (MDS) is active(EMEA, LATAM and APAC). 2-3 kph (1.3-1.9 mph) difference between cruise set speed and the actual vehicle speed(EMEA, LATAM and APAC).
18-008-20 REV. A2021-03-01. Service bulletin. FUEL SYSTEM, GASOLINE; EQUIPMENT; ENGINE AND ENGINE COOLING; 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. DTCs have been set:Change DTC number from P0101-00 to P0109-00 - Mass Air Flow Sensor Performance. P015E - Excessive Time to Enter Closed Loop Fuel Timing Control. P0534-00 - AC Refrigerant System A Charge Loss. P26FB-00 - EGR Cooler Bypass Control Stuck Closed Bank 1. P04DB-00 - Crankcase Ventilation System Disconnected. P204F-00 - Reductant System Performance. P200A-00 - Intake Manifold Runner Performance - Bank 1. P200B-00 - Intake Manifold Runner Performance - Bank 2. P2D2D-00 - Cold Start Intake Manifold Runner Performance Bank 1. P2D2E-00 - Cold Start Intake Manifold Runner Performance Bank 2. P2199-00 - Intake Air Temperature Sensor 1 / 2 Correlation. P22FA-00 - NOX Sensor Performance - Slow Response High To Low Bank 1 Sensor 1. P2002-00 - Diesel Particulate Filter Efficiency Below Threshold. P0087-00 - Fuel Rail Pressure Too Low. P0128-00 - Thermostat Rationality(additional software enhancement). P0300-00 - Multiple Cylinder Misfire(cold ambient temperature). P0301-00 - Cylinder 1 Misfire(cold ambient temperature). P0302-00 - Cylinder 2 Misfire(cold ambient temperature). P0303-00 - Cylinder 3 Misfire(cold ambient temperature). P0304-00 - Cylinder 4 Misfire(cold ambient temperature). P0305-00 - Cylinder 5 Misfire(cold ambient temperature). P0306-00 - Cylinder 6 Misfire (cold ambient temperature). P01CB-00 - Cylinder 1 Injection Timing Performance - Over Retarded. P01CC-00 - Cylinder 1 Injection Timing Performance - Over Advanced. P01CD-00 - Cylinder 2 Injection Timing Performance - Over Retarded. P01CE-00 - Cylinder 2 Injection Timing Performance - Over Advanced. P01CF-00 - Cylinder 3 Injection Timing Performance - Over Retarded. P01D0-00 - Cylinder 3 Injection Timing Performance - Over Advan
708012021-03-01. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. Warranty Bulletin D-20-23 Part Order Restiction Program - 48V Power Pack Unit (PPU) - Select 2018-2020 Jeep Wrangler (JL) and 2019-2021 RAM (DT)

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