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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

Bulletins, newest first
1400522REVB2023-01-09. Service bulletin. FUEL SYSTEM, GASOLINE. Updated Fuel Filler Cap This bulletin involves updating the fuel filler cap with improved version. 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: P0455 - EVAP System Large Leak. P0456 - EVAP System Small Leak. P04EC - EVAP System Large Leak Detected - Fuel Tank Side. P04EE - EVAP System Very Small Leak Detected - Fuel Tank Side.
855072023-01-09. Service bulletin. FUEL SYSTEM, GASOLINE. Warranty Bulletin D-19-02 Fast Feedback Program - 6.7L Cummins Engine & Fuel Injection Pump - 2019 - 2023 HD Ram ? All Models (Rev. J)
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
S1923000015RevB2023-01-09. Service bulletin. POWER TRAIN. Transmission Column Shifter Lever Feels Loose
91000212023-01-09. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:CRANK/CAMSHAFT POSITION SENSOR. Seal, Crankshaft Oil, Rear,Retainer, Crankshaft Oil Seal US dealers only: If you are replacing the rear main seal due to an oil leak, do NOT remove the seal from the retainer. Replace the seal and retainer (pn# 05086755A$) as a complete unit. Engineering needs to obtain the seals and retainers back for analysis without them having been disassembled. Once repairs are complete, please contact FCA Redacted Content to return the parts.
822942023-01-09. Service bulletin. FUEL SYSTEM, GASOLINE; ENGINE AND ENGINE COOLING. Warranty Bulletin D-19-02 Fast Feedback Program - 6.7L Cummins Engine & Fuel Injection Pump - 2019 - 2022 HD Ram - All Models (Rev. I)
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
S22080000732023-01-09. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM). No Start, After Flash And Or PCM Replace, DTC P0513 Invalid Skim Key Setting
S22080000112023-01-09. Service bulletin. ELECTRICAL SYSTEM:PROPULSION SYSTEM:CHARGING:CABLE/CORD:ACCESSORY; EQUIPMENT:ELECTRICAL:WIRELESS CHARGER/CRADLE. Wireless Qi Charger Not Charging
S17080001182023-01-09. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. Battery Drain Concern, Dual USB Port Normal Operational Draw, Extended Illumination Or Extended Operation After Key Off
S22080000682023-01-09. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. ?Device Not Supported? Message on the radio screen
S22090000022023-01-09. Service bulletin. ENGINE. Customer complaints may include abnormal engine noise, rough idle, lack of power, misfire. When performing diagnosis, an internal engine concern may be suspected.
S19230000502023-01-09. Service bulletin. STRUCTURE:BODY:HOOD; STRUCTURE. Hood Shake Or Flutter While Driving
22001222022-12-19. Service bulletin. BACK OVER PREVENTION; LANE DEPARTURE; SERVICE BRAKES, HYDRAULIC; EXTERIOR LIGHTING. TPMS Does Not Read Tire Pressure For The Rear Tires This bulletin involves adding a sales code and performing a restore vehicle configuration. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find thefollowing Diagnostic Trouble Code (DTC) has been set: C15CE-31 - Tire Pressure Sensor 7-No Signal. Customers may also comment on the following: Instrument Panel Cluster (IPC) warning is illuminated for the tire pressure sensors.
S22090000042022-12-19. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING. If a Mopar oil filter is not available, use a filter that meets or exceeds USCAR36 specification and is compatible with semi and full synthetic oils.
90044142022-12-19. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN; FUEL SYSTEM, DIESEL. DRIVE, Fan If a heavy duty diesel vehicle comes in with reports of loud fan noise or fan always on, please call FCA Redacted Content. If no response within 15 minutes, proceed with repair
2101922REVA2022-12-12. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM. Flash: Transmission Control Module (TCM) Updates This bulletin involves reprogramming the TCM with the latest available software. Customers may comment on one or more of the following: Harsh shifts. Poor shift quality, with light pedal.(Sales Codes ETM and ETN Only). Poor shift quality, 32-48 kph (20-30 mph), at low rpm with light to medium pedal apply, typically tipping in from zero pedal.(Sales Codes ETM and ETN Only). Coasting shift bump with exhaust brake and/or tow/haul active.(Sales Codes ETM and ETN Only). Poor shift quality, often when increasing pedal during a shift.(Sales Code ESB Only). Squawk/chirp/squeak type noise during a 3-4 upshift.(D2 Only). Poor 1-2 upshift quality.(D2 with ETM or DD/DP with Sales Code ESB Only). When decelerating from a 1 to 2 gear shift, the vehicle may have a harshshift. From a 1 to 2 gear change there may be a perceived bump feeling, whilehaving a light pedal(Sales Codes ETL and ETN Only). A harsh shift from a 2 to 3 gear shift while at almost or wide openthrottle. A harsh shift from a 3 to 4 shift and heavy on the pedal, lifting offthe pedal, then back on the pedal again. While coasting down a grade, an abrupt deceleration may be felt. A clunk heard when shifting from park to reverse or drive. Cold engine flare during a shift. A delay when coasting down, vehicle is in a downshift at low speedsand then trying to accelerate. (The vehicle will have a hesitation as the vehicle tries to change gears to accommodate the new pedaldemand). Excessive shifting(DD and DP Only). Engine flare caused by the transmission releasing the clutch too early duringa 1 to 2 shift.
S228A0000282022-12-12. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. Radio Remained On After Ignition Is Switched Off, Dead Battery from Excessive Radio Current Draw
S2208000153RevA2022-12-12. Service bulletin. SERVICE BRAKES; ELECTRICAL SYSTEM. Tire Pressure Lamp Flashing, No Tire Pressures Displayed, ?Tire Pressure Module (TPM) System Unavailable? Message Displayed on Cluster
S22230000702022-11-07. Service bulletin. VISIBILITY; VISIBILITY:REARVIEW MIRRORS/DEVICES:EXTERIOR. Exterior Mirror Lamp Service
S18080000972022-11-07. Service bulletin. BACK OVER PREVENTION:DISPLAY FUNCTION; ELECTRICAL SYSTEM:ADAS:DRIVER MONITORING:CAMERA/SENSOR; BACK OVER PREVENTION. Back-Up Camera Inoperative Complaints, Radio Display Blue or Blank When Placed in Reverse
S22140000032022-11-07. Service bulletin. FUEL SYSTEM, DIESEL. Guidelines For The Use Of Alternative Diesel Fuels.
S22230000632022-11-07. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM; ELECTRICAL SYSTEM:BODY CONTROL MODULE/BCM. Ambient Temperature Sensor Servicing.
S22080001532022-11-07. Service bulletin. ELECTRICAL SYSTEM; TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS; SERVICE BRAKES, HYDRAULIC. Tire Pressure Lamp Flashing, No Tire Pressures Displayed, ?Tire Pressure Module (TPM) System Unavailable? Message Displayed on Cluster

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