# 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 bulletins from NHTSA, as of 2026-10-19.

- [114254](/bulletins/11036754.md), 2026-09-03, Service bulletin: ENGINE. RADIATOR \- ENGINE COOLING
- [114255](/bulletins/11036753.md), 2026-09-03, Service bulletin: ENGINE. RADIATOR \- ENGINE COOLING
- [113744](/bulletins/11035981.md), 2026-08-06, Service bulletin: ENGINE; ELECTRICAL SYSTEM. SENSOR \- TURBOCHARGER SPEED
- [113742](/bulletins/11035980.md), 2026-08-06, Service bulletin: ENGINE; ELECTRICAL SYSTEM. SENSOR \- TURBOCHARGER SPEED
- [113276](/bulletins/11035075.md), 2026-07-18, Service bulletin: UNKNOWN OR OTHER. CORE – HEATER
- [113277](/bulletins/11035074.md), 2026-07-18, Service bulletin: UNKNOWN OR OTHER. CORE – HEATER
- [113069](/bulletins/11034910.md), 2026-07-08, Service bulletin: STRUCTURE:BODY; ELECTRICAL SYSTEM. SWITCH – HEADLAMP
- [113070](/bulletins/11034909.md), 2026-07-08, Service bulletin: ELECTRICAL SYSTEM; STRUCTURE:BODY. SWITCH – HEADLAMP
- [S2208000045 REV.D](/bulletins/11034385.md), 2026-07-02, Service bulletin: STRUCTURE:BODY. Backup Camera Poor Image Quality Inspection
- [113066](/bulletins/11034376.md), 2026-07-02, Service bulletin: UNKNOWN OR OTHER. OUTLET \- AIR CONDITIONING \& HEATER
- [113065](/bulletins/11034375.md), 2026-07-02, Service bulletin: UNKNOWN OR OTHER. OUTLET \- AIR CONDITIONING \& HEATER
- [112906](/bulletins/11034373.md), 2026-07-02, Service bulletin: ENGINE. BEARING \- CRANKSHAFT THRUST and KIT
- [112906](/bulletins/11034337.md), 2026-07-02, Service bulletin: ENGINE. BEARING \- CRANKSHAFT THRUST and KIT
- [S1623000028 Rev. K](/bulletins/11033975.md), 2026-06-18, Service bulletin: ELECTRICAL SYSTEM; STRUCTURE:BODY. Outside Power Fold Rearview Mirror Noise Or Loose At Pivot. Mirror Contacts Door Window Glass In The Folded Position.
- [S1623000028 REV.J](/bulletins/11033897.md), 2026-06-16, Service bulletin: STRUCTURE:BODY. Outside Power Fold Rearview Mirror Noise Or Loose At Pivot. Mirror Contacts Door Window Glass In The Folded Position.
- [9100831](/bulletins/11033889.md), 2026-06-16, Service bulletin: STRUCTURE:BODY. For Dealer awareness, HD truck, eliminate 1 of 2 M8 Joints for Sidestep bracket to Body Attachment, Bolt and rivet \(06102165AA, 06511062AA\) per TCR \# 402632, CN 80403\-T18
- [S1623000028 REV.I](/bulletins/11033308.md), 2026-06-03, Service bulletin: ELECTRICAL SYSTEM; STRUCTURE:BODY. Outside Power Fold Rearview Mirror Noise Or Loose At Pivot. Mirror Contacts Door Window Glass In The Folded Position.
- [9100692 Rev 1](/bulletins/11033001.md), 2026-05-28, Service bulletin: ENGINE. On Cummins diesel applications that are for 2019 and newer the bpro part 1BP00507AB can on occasions create a check engine light. In these situations, it is recommended to use the appropriate Mopar air filter originally installed on the vehicle. The "AC" level of the part is in development to resolve this issue. 1BP00507AB should still be usable for 2018 and older Model year Cummins engines.
- [111478](/bulletins/11032990.md), 2026-05-28, Service bulletin: ENGINE. RADIATOR \- ENGINE COOLING
- [21\-039\-26](/bulletins/11032827.md), 2026-05-20, Service bulletin: POWER TRAIN. Replace K1 Clutch / Input Shaft Assembly Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must exhibit/set the following Diagnostic Trouble Code \(DTC\): ● P0731\-00 \- Gear 1 Shift Incorrect Ratio \(This DTC will set during a key cycle and shifting into Drive\). Customers must also comment on the following: ● The transmission will not shift into or out of 1st \- 4th gears. 5th and reverse gears are still available This bulletin involves replacing the K1 clutch and possibly the K1 input shaft drum sub\-assembly. These repairs are to be performed only if the vehicle is inoperable due to K1 clutch failure
- [21\-039\-26](/bulletins/11032650.md), 2026-05-13, Service bulletin: POWER TRAIN. Replace K1 Clutch / Input Shaft Assembly Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must exhibit/set the following Diagnostic Trouble Code \(DTC\): ● P0731\-00 \- Gear 1 Shift Incorrect Ratio \(This DTC will set during a key cycle and shifting into Drive\). Customers must also comment on the following: ● The transmission will not shift into or out of 1st \- 4th gears. 5th and reverse gears are still available This bulletin involves replacing the K1 clutch and possibly the K1 input shaft drum sub\-assembly. These repairs are to be performed only if the vehicle is inoperable due to K1 clutch failure
- [S2623000032](/bulletins/11032344.md), 2026-05-06, Service bulletin: STRUCTURE:BODY. Squeak Or Squawk Noise Coming From Either Side Door Of The Vehicle, It Could Be Just One Door Or More. The Noise Can Be Present In Either The Upper Or The Lower Hinge.
- [S2509000005 REV.B](/bulletins/11031471.md), 2026-04-22, Service bulletin: ENGINE. Light Random Tick Noise From The Engine.
- [S2614000002](/bulletins/11031466.md), 2026-04-22, Service bulletin: ENGINE. Diagnostic Trouble Code \(DTC\) P2459\-00 Particulate Filter Regeneration Too Frequent Setting in the Powertrain Control Module \(PCM\) or Under Fueling or Over Fueling Condition After Fuel Injector\(s\) Replacement
- [S1623000028 REV.H](/bulletins/11031241.md), 2026-04-10, Service bulletin: STRUCTURE:BODY. Outside Power Fold Rearview Mirror Noise Or Loose At Pivot. Mirror Contacts Door Window Glass In The Folded Position.

More: [the next page](/v1/vehicles/2021_ram_4500/bulletins?cursor=2026-04-10_11031241) (JSON)

JSON: [/v1/vehicles/2021_ram_4500/bulletins](/v1/vehicles/2021_ram_4500/bulletins)

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