# Service bulletin 55309

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.

- Type: Service bulletin
- NHTSA id: 10162502
- Published by NHTSA: 2019\-07\-15
- Manufacturer's number: 55309
- Manufacturer's date: 2019\-05\-22
- NHTSA component: EQUIPMENT; POWER TRAIN

## NHTSA's summary

Power Transfer Unit

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2019/MC-10162502-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2019/MC-10162502-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Equipment and accessories, Transmission and driveline

## Vehicles listed

- CHRYSLER CHRYSLER
- DODGE DODGE
- 2010 to 2012 DODGE RAM 1500
- 2010 to 2012 DODGE RAM 2500
- 2010 to 2012 DODGE RAM 3500
- 2011 to 2012 DODGE RAM 4500
- 2011 to 2012 DODGE RAM 5500
- JEEP JEEP
- 2009 RAM 1500
- 2013 to 2020 RAM 1500
- 2009 RAM 2500
- 2013 to 2019 RAM 2500
- 2007 to 2009 RAM 3500
- 2013 to 2019 RAM 3500
- 2008 to 2009 RAM 4500
- 2013 to 2019 RAM 4500
- 2008 to 2009 RAM 5500
- 2013 to 2019 RAM 5500
- 2013 to 2016 RAM C/V TRADESMAN
- 2014 to 2019 RAM PROMASTER
- 2015 RAM PROMASTER 2500
- 2016 RAM PROMASTER 3500
- 2015 to 2019 RAM PROMASTER CITY
- 2010 RAM redundant 4500
- 2010 RAM redundant 5500

## Recalls for the same vehicles and component

- [2020401](/recalls/tc/2020401.md), 2020-08-28: Powertrain
- [20V080000](/recalls/nhtsa/20V080000.md), 2020-02-13: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\)
- [2020025](/recalls/tc/2020025.md), 2020-01-24: Powertrain
- [20V043000](/recalls/nhtsa/20V043000.md), 2020-01-24: POWER TRAIN:AUTOMATIC TRANSMISSION
- [2019206](/recalls/tc/2019206.md), 2019-04-26: Powertrain
- [19V324000](/recalls/nhtsa/19V324000.md), 2019-04-25: POWER TRAIN:DRIVELINE:DRIVESHAFT
- [2018447](/recalls/tc/2018447.md), 2018-08-23: Powertrain
- [18V556000](/recalls/nhtsa/18V556000.md), 2018-08-23: POWER TRAIN:AXLE ASSEMBLY
- [2018422](/recalls/tc/2018422.md), 2018-08-09: Powertrain
- [2018230](/recalls/tc/2018230.md), 2018-05-03: Accessories

## Other bulletins for the same vehicles and component

- [S2621000004](/bulletins/11038329.md), 2026-10-07, Service bulletin: POWER TRAIN. The Customer May Complain About a Popping Noise, Grinding Noise, or an Intermittent No Reverse or Forward Transmission Engagement. The Tech May Find Damaged and/or Worn Transmission Output Shaft Splines \(850RE Transmission Only\)
- [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
- [S2621000003 REV.A](/bulletins/11030138.md), 2026-03-18, Service bulletin: POWER TRAIN. The vehicle will exhibit a service transmission/check engine warning indicator for the following transmission models: 845RE, 8HP45, 850RE, 8HP50, 8HP70, 8HP75, 8HP75\-PHEV, 8HP75\-LCV, 8HP90, 8HP95. Transmissions may exhibit the following diagnostic codes: P07E4, P1DB2, P0716, P1B14, P0733, P1D90, P1DB7, P1B13.
- [S2621000003](/bulletins/11029770.md), 2026-03-05, Service bulletin: POWER TRAIN. Service transmission/check engine warning indicator for the 850RE, 8HP50, 8HP70, 8HP75, 8HP75\-PHEV transmissions that have fault codes P07E4, P1DB2, P0716, P1B14, P0733, P1D90, P1DB7, P1B13.
- [S2516000001](/bulletins/11024577.md), 2025-10-29, Service bulletin: POWER TRAIN. Driveline Vibration. Prop Shaft Diagnostic Information.
- [21\-040\-25](/bulletins/11024056.md), 2025-10-08, Service bulletin: POWER TRAIN. 948TE Transmission Reaction Shaft Service Bushing Kit Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle may exhibit/set the following Diagnostic Trouble Code \(DTC\): ● P1DB7\-00 \- Torque Converter Clutch Performance.
- [03\-008\-25](/bulletins/11023321.md), 2025-09-24, Service bulletin: POWER TRAIN. Rear Axle Vibration Shudder Or Chatter Customers may experience the following: ● A chatter, shudder, or vibration from the rear axle during turns. NOTE: This may happen more as the vehicle ages, especially if the vehicle is used extensively for towing or hauling heavy loads. The cause of the concern may be due to degradation of the rear axle fluid. It is very important to follow the routine maintenance schedules on these vehicles when it comes to changing the rear axle fluid if the vehicle is used primarily for towing or hauling heavy loads. If you experience a vehicle with the above condition, please perform the proper maintenance procedures for the rear axle and replace the fluid first before replacing any hardware components. NOTE: This service bulletin is only applicable to vehicles that have no history of an axle fluid replacement. If the vehicle usage includes police, taxi, fleet, off\-road or frequent trailer towing, regular axle fluid changes are required every 3 years or 30,000 miles \(whichever comes first\) per the Maintenance Schedule in the vehicle Owner's Manual. This bulletin involves changing the rear axle lube to possibly address a chatter, shudder or vibration.
- [9100642](/bulletins/11021844.md), 2025-08-13, Service bulletin: POWER TRAIN. When customer complaint is related to inoperative 4 Wheel Drive shifter, loss of 4WD function and/or 4WD related MIL please reference SOL Case \#S2508000062 prior to replacement of Transfer Case shift motor.
- [9100627](/bulletins/11020855.md), 2025-07-23, Service bulletin: POWER TRAIN. To inform dealers about the 850RE valve body PN: R8348504A connector: the original 16\-pin connector included six pins that were not used in this application. To simplify the design, the connector has been optimized and updated to a 10\-pin configuration.

JSON: [/v1/bulletins/10162502](/v1/bulletins/10162502)

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