# Service bulletin 9100641

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: 11021842
- Published by NHTSA: 2025\-08\-13
- Manufacturer's number: 9100641
- Manufacturer's date: 2025\-08\-05
- NHTSA component: POWER TRAIN

## NHTSA's summary

Symptoms/Condition: Shifter reports loss communication AND NO OTHER MODULES report the condition. Diagnostic: Please make sure ONLY shifter reports loss communication. If there are other modules reporting loss communication, then follow the existing service procedure Repair Procedure: 1. Verify Complaint \- ESM reports a Loss of Communication \(LOC\) DTC, but no other modules do. \- If multiple modules report the same LOC, the ESM is not the cause \(its not a gateway module\). 2. Read DTCs \- Relevant codes: U0101, U0140, U0155, U0129, U11C3, U0402, U0422, U0423, U0415, U145D. \- If multiple LOC DTCs are present: a. Check battery health, system voltage, and TCM \(including valve body\). b. If TCM goes offline, ESM may falsely report LOC DTCs. 3. Check Environmental Data \- Look for voltage/system issues at the same mileage. a. If DTCs clear, do not replace ESM. b. If not, inspect: b.1 Module connectors/pins: If damaged, dont repair shifter. b.2 TCM connectors/pins: Same rule. b.3 AGSM connectors/pins: If damaged, repair shifter. b.4 AGSM wiring harness: If damaged, dont repair shifter. 4. Review Past Service \- Confirm battery and TCM\-related repairs are still effective. a. If not, fix and clear DTCs. b. If yes, continue. 5. Check for Other LOCs \- If other modules report LOC to the same module, inspect that module. \- If not, repair the AGSM. Additional Description: \- The ESM only communicates with the TCM and is fully controlled by it. \- In non\-combustion engines, the TCM is replaced by the PCM. \- If a stored DTC in the ESM disappears and doest return, do not replace the ESM.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11021842-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11021842-9999.pdf)

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

## Components

Transmission and driveline

## Trouble codes named

U0101, U0129, U0140, U0155, U0402, U0415, U0422, U0423, U11C3, U145D

## Vehicles listed

- 2024 to 2026 JEEP GRAND CHEROKEE
- 2024 to 2026 JEEP GRAND CHEROKEE 4XE
- 2024 to 2026 JEEP GRAND CHEROKEE L
- 2024 to 2025 JEEP GRAND WAGONEER
- 2024 to 2025 JEEP WAGONEER

## 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

## 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 \(850RE Transmission Only\)
- [08\-289\-26 REV. A](/bulletins/11035971.md), 2026-08-06, Service bulletin: POWER TRAIN. Transmission Control Module \(TCM\) Diagnostic N/A \- This bulletin was released in error. SYMPTOM:
- [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.
- [08\-289\-26](/bulletins/11035313.md), 2026-07-29, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN. Transmission Control Module \(TCM\) Diagnostic Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following DTCs: ● P2797\-00 \- Auxiliary Transmission Fluid Pump Performance ● P1625\-00 \- Park Pawl System Failure NOTE: Park system still functions, no impact to park engagement. NOTE: Vehicle will not experience unintended movement. Customers may also experience one or more of the following: ● Vehicle no start due to battery discharge. ● 'Start/stop inop' message. ● 'Service Transmission' message on in Instrument Panel Cluster \(IPC\).
- [113528](/bulletins/11035187.md), 2026-07-23, Service bulletin: POWER TRAIN. SHAFT \- AXLE HALF
- [113529](/bulletins/11035186.md), 2026-07-23, Service bulletin: POWER TRAIN. SHAFT \- AXLE HALF
- [21\-053\-26](/bulletins/11034906.md), 2026-07-08, Service bulletin: POWER TRAIN. Service Transmission Message Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set the following Diagnostic Trouble Code \(DTC\): ● P2797\-00 \- Auxiliary Transmission Fluid Pump Performance. Customers may also comment on the following: ● Engine Stop\-Start \(ESS\) does not operate. ● "Service Transmission" message displayed in the Instrument Panel Cluster \(IPC\). This bulletin involves inspecting and possibly replacing the transmission oil pump motor.
- [21\-041\-26 REV. A](/bulletins/11034324.md), 2026-07-02, Service bulletin: POWER TRAIN. Transmission Auxiliary Oil Pump Failure Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set \*\*one or more the following Diagnostic Troubles Code \(DTCs\): ● U0287\-00 \- Lost Communication With Transmission Fluid Pump Module 1.\*\* ● P0B0D\-00 \- Electric/Auxiliary Transmission Fluid Pump Motor Control Module. Customers may also comment on the following: ● Vehicle is in limp mode. This bulletin involves replacing the transmission oil pump.
- [21\-049\-26](/bulletins/11033870.md), 2026-06-16, Service bulletin: POWER TRAIN. Flash: Transmission Control Module \(TCM\) Updates Customers may experience one or more of the following: ● Intermittently during low‑speed parking maneuvers when the driver moves from Drive \(D\) to Reverse \(R\) at the exact moment the Engine Stop/Start \(ESS\) system shuts the engine off. ● When the timing aligns, the engine will not automatically restart, and the Instrument Panel Cluster \(IPC\) displays a shift to park to start reated message. ● NOTE: The behavior results from safety logic that prevents the PCM from restarting the engine while the transmission is in an engaged gear. NOTE: No Diagnostic Trouble Codes \(DTCs\) or Malfunction Indicator Lamp \(MIL\) are set because the system is functioning as designed. NOTE: This may appear as an ESS stall, but it is actually a controlled inhibit, not a malfunction. NOTE: The condition is difficult to reproduce due to the timing window required. This bulletin involves inspecting and possibly reprogramming the PCM and Transmission Control Module \(TCM\) with the latest available software.
- [18\-058\-26](/bulletins/11033868.md), 2026-06-16, Service bulletin: POWER TRAIN. Flash: Powertrain Control Module \(PCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must exhibit/set one of the following Diagnostic Trouble Codes \(DTCs\): ● P1CEA \- Boost Side Evap Purge System Performance. ● P0300\-00 \- Random/Multiple Cylinder Misfire Detected ● P0301\-00 \- Cylinder 1 Misfire ● P0302\-00 \- Cylinder 2 Misfire ● P0303\-00 \- Cylinder 3 Misfire ● P0304\-00 \- Cylinder 4 Misfire Customers may also experience one or more of the following: ● Engine RPM fluctuations at low vehicle speeds after extended idling. ● An ignition\-off draw or battery drain condition. ● Sluggish engine performance and misfires. ● Engine knocking when the accelerator is pressed hard or quickly This bulletin involves inspecting and possibly reprogramming the PCM and Transmission Control Module \(TCM\) with the latest available software.

JSON: [/v1/bulletins/11021842](/v1/bulletins/11021842)

[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%209100641&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11021842&vehicle=Service%20bulletin%209100641)