# Service bulletin 21\-048\-24

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: 11006985
- Published by NHTSA: 2024\-09\-04
- Manufacturer's number: 21\-048\-24
- Manufacturer's date: 2024\-08\-30
- NHTSA component: POWER TRAIN
- Manufacturer's system: Transfer Case: Active Shift Motor

## NHTSA's summary

"Transfer Case Active Shift Motor Replacement Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● C1444\-98 \- T\-Case Motor Overuse\-Component Or System Over Temperature. ● C1477\-4B \- Transfer Case Clutch\-Over Temperature. Customers may also comment on the following: ● ""4WD Overheated Temporarily Unavailable"" message displayed in the Instrument Panel Cluster \(IPC\). This bulletin involves replacing the transfer case shift motor."

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2024/MC-11006985-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2024/MC-11006985-9999.pdf)

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

## Components

Transmission and driveline

## Trouble codes named

C1444, C1477

## Vehicles listed

- 2022 to 2024 JEEP GRAND WAGONEER
- 2022 to 2024 JEEP WAGONEER
- 2022 to 2024 RAM 1500

## Recalls for the same vehicles and component

- [26V413000](/recalls/nhtsa/26V413000.md), 2026-06-30: POWER TRAIN:AUTOMATIC TRANSMISSION:GEAR POSITION INDICATION \(PRNDL\)
- [2025450](/recalls/tc/2025450.md), 2025-09-04: Powertrain
- [2024325](/recalls/tc/2024325.md), 2024-06-06: Powertrain
- [24V413000](/recalls/nhtsa/24V413000.md), 2024-06-06: POWER TRAIN:MANUAL TRANSMISSION; POWER TRAIN:AUTOMATIC TRANSMISSION

## 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 \(850RE Transmission Only\)
- [18\-070\-26](/bulletins/11035320.md), 2026-07-29, Service bulletin: POWER TRAIN. Flash: Powertrain Control Module \(PCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● \*\*U0104\-00 \- Lost Communication With Cruise Control Module \(NA Market Only\) \(In Active or Stored status\). ● U0405\-00 \- Invalid Data Received From Cruise Control Module \(NA Market Only\) \(In Active or Stored status\). NOTE: Vehicles setting DTCs U0405\-00 and U0104\-00 may experience an inability to be cleared.\*\* ● P2AF6\-00 \- Dual Starter Relay Stuck \(in active or stored status\). ● P1CEA \- Boost Side EVAP Purge System Performance \(in active or stored status\). ● P2C90\-00 \- Crankcase Ventilation System \- Hose "A" Disconnected \(in active or stored status\). ● P0111\-00 \- Intake Air Temperature Sensor 1 Circuit Range Performance Bank 1 \(in active or stored status\). ● P0071\-00 \- Ambient Air Temperature Sensor Performance \(in active or stored status\). ● P0325\-00 \- Knock/Combustion Vibration Sensor 1 Circuit \(in active or stored status\). ● P0072\-00 \- Ambient Air Temperature Sensor Circuit "A" Low \(in active or stored status\). ● P0073\-00 \- Ambient Air Temperature Sensor Circuit "A" High \(in active or stored status\). ● P0011\-00 \- Bank 1 Camshaft 1 Position Timing Over Advanced Or \(in active or stored status\). ● P25E4\-00 \- B Camshaft Position \- Unable To Achieve Locked Position Bank 1 \(in active or stored status\). ● U0673\-00 \- Lost Communication With Ion Sense Module \(in active or stored status\). ● P05BD\-00 \- Stop\-Start Mode Switch Range/Performance \(in active or stored status\). ● P06DD\-00 \- Engine Oil Pressure Control Circuit Performance/stuck Off \(in active or stored status\). ● P0116\-00 \- Engine Coolant Temperature Sensor 1 Performance \(in active or stored status\). ● P00C6\-00 \- Fuel Rail Pressure Too Low \- Engine Cranking \(in active or stored status\). ● P0330\-00 \- Knock/Combustion Vibration Sensor 2 Circuit \(in active or stored status\). This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software.
- [18\-069\-26](/bulletins/11035319.md), 2026-07-29, Service bulletin: POWER TRAIN. Flash: Powertrain Control Module \(PCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● \*\*U0104\-00 \- Lost Communication With Cruise Control Module \(NA Market Only\) \(In Active or Stored status\). ● U0405\-00 \- Invalid Data Received From Cruise Control Module \(NA Market Only\) \(In Active or Stored status\). NOTE: Vehicles setting DTCs U0405\-00 and U0104\-00 may experience an inability to be cleared.\*\* ● P0111\-00 \- Intake Air Temperature Sensor 1 Circuit Range Performance Bank 1 \(In Active or Stored status\). ● P0071\-00 \- Ambient Air Temperature Sensor Performance \(In Active or Stored status\). ● P0072\-00 \- Ambient Air Temperature Sensor Circuit "A" Low \(In Active or Stored status\). ● P0073\-00 \- Ambient Air Temperature Sensor Circuit "A" High \(In Active or Stored status\). ● P0011\-00 \- Bank 1 Camshaft 1 Position Timing Over Advanced Or \(In Active or Stored status\). ● P25E4\-00 \- B Camshaft Position \- Unable To Achieve Locked Position Bank 1 \(In Active or Stored status\). ● U0673\-00 \- Lost Communication With Ion Sense Module \(In Active or Stored status\). ● P05BD\-00 \- Stop\-Start Mode Switch Range/Performance \(In Active or Stored status\). ● P06DD\-00 \- Engine Oil Pressure Control Circuit Performance/stuck Off \(In Active or Stored status\). ● P0116\-00 \- Engine Coolant Temperature Sensor 1 Performance \(In Active or Stored status\). ● P00C6\-00 \- Fuel Rail Pressure Too Low \- Engine Cranking \(In Active or Stored status\). ● P0325\-00 \- Knock/Combustion Vibration Sensor 1 Circuit \(In Active or Stored status\). ● P0330\-00 \- Knock/Combustion Vibration Sensor 2 Circuit \(In Active or Stored status\). ● P032A\-00 \- Knock \- Combustion Vibration Sensor C Circuit \(In Active or Stored status\). ● P062B\-00 \- Internal Control Module Fuel Injector Control Performance \(In Active or Stored status\). This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software.
- [18\-068\-26](/bulletins/11035176.md), 2026-07-23, Service bulletin: POWER TRAIN. Flash: Powertrain Control Module \(PCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● \*\*U0405\-00 \- Invalid Data Received From Cruise Control Module. ● U0104\-00 \- Lost Communication With Cruise Control Module. NOTE: Vehicles setting DTCs U0405\-00 and U0104\-00 may experience an inability to be cleared.\*\* ● P00C6\-00 \- Fuel Rail Pressure Too Low \- Engine Cranking. ● P06DD\-00 \- Engine Oil Pressure Control Circuit Stuck Off. ● P0604\-00 \- Internal Control Module Random Access Memory Ram Error. ● P060C\-00 \- Internal Control Module Main Processor Performance. This bulletin involves reprogramming the PCM with the latest available software.
- [21\-057\-26](/bulletins/11035059.md), 2026-07-18, Service bulletin: POWER TRAIN. Flash: Transmission Control Module \(TCM\) Updates Customers may comment on one or more of the following: SYMPTOM: ● Harsh or slipping feeling during upshifts \(1st \- 5th\). ● Harsh or slipping feeling during kickdown events under throttle. ● Transmission fluid odor \(burnt smell\). This bulletin involves reprogramming the TCM with the latest available software.
- [21\-055\-26](/bulletins/11035057.md), 2026-07-18, Service bulletin: POWER TRAIN. Flash: Transmission Control Module \(TCM\) Updates Customers may comment on one or more of the following: SYMPTOM: ● Harsh or slipping feeling during upshifts \(1st \- 5th\). ● Harsh or slipping feeling during kickdown events under throttle. ● Transmission fluid odor \(burnt smell\). This bulletin involves reprogramming the TCM with the latest available software.
- [21\-054\-26](/bulletins/11035056.md), 2026-07-18, Service bulletin: POWER TRAIN. Flash: Transmission Control Module \(TCM\) Updates Customers may comment on one or more of the following: SYMPTOM: ● Harsh or slipping feeling during upshifts \(1st \- 5th\). ● Harsh or slipping feeling during kickdown events under throttle. ● Transmission fluid odor \(burnt smell\).
- [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.
- [08\-417\-25](/bulletins/11027239.md), 2026-01-07, Service bulletin: POWER TRAIN. Drivetrain Control Module \(DTCM\) Software Update Customers may experience one or more of the following: ● Rear axle bind during slow speed turning. Feels like the 4WD is active. ● While moving above 5 kph \(3.1 mph\) transmission goes into limp mode. This bulletin involves flashing the DTCM to the latest software level.

JSON: [/v1/bulletins/11006985](/v1/bulletins/11006985)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%2021-048-24&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11006985&vehicle=Service%20bulletin%2021-048-24)