# Service bulletin 18\-022\-25

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: 11018020
- Published by NHTSA: 2025\-05\-06
- Manufacturer's number: 18\-022\-25
- Manufacturer's date: 2025\-04\-29
- NHTSA component: POWER TRAIN
- Manufacturer's system: Powertrain Control Module

## NHTSA's summary

"Flash: Powertrain Control Module \(PCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● P1CEA \- Boost Side EVAP Purge System Performance. ● P2AF6 \- Dual Starter Relay Stuck. ● P026E \- Charge Air Cooler Coolant Pump Performance. Customers may also comment on one or more of the following: ● Low battery State of Charge \(SoC\) leading to battery replacement. ● Vehicle does not restart after an Engine Stop Start \(ESS\) event but will restart after an ignition cycl This bulletin involves reprogramming the PCM with the latest available software."

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11018020-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11018020-9999.pdf)

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

## Components

Transmission and driveline

## Trouble codes named

P026E, P1CEA, P2AF6

## Vehicles listed

- 2025 JEEP GRAND WAGONEER
- 2025 JEEP WAGONEER

## Other bulletins for the same vehicles and component

- [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.
- [9100672 Rev 3](/bulletins/11024605.md), 2025-10-29, Service bulletin: POWER TRAIN. Replacement components for transfer case are no longer available. To repair issue, use the following part numbers and follow the I\-sheet instructions for assembly: 68738079AA \- HOUSING 68738084AA \- CAM 68738085AA \- GEAR 68737112AA \- PLATE Please note that the part numbers listed here are transfer case components, not full transfer case part numbers.
- [9100437Rev1](/bulletins/11024582.md), 2025-10-29, Service bulletin: POWER TRAIN. The service shifter message comes on in the cluster and the lever gets stuck in park "P" and it can be present the follwoing DTC: \- U11E3 \- TCM Lost communication with ESM on D\-PT CAN \- U0103 \- Lost communication with Electric Gear Shift Module \- U0101\- Lost communication with DTCM \- U0418 \- Implausible Data Received From Brake System Control Module \- U0402 \- Implausible data received from TCM \*\*NOTE: Prior any shifter replacement Refer to TSB\-21\-016\-25 2024\-2025 WS \- Valve Body Replacement. Recommended Diagnosis procedure: 1. Confirm if U0101 \-Lost Communication with TCM or U0418 \-Implausible Data Received From Brake System Control Module are present, if so check the Valve Body CAN Terminals any corrosion. 2. Check the wiring connectors between the ESM and the TCM and check voltage. 3. Check the pin header for the ESM for any bent pins. 4. If wiring and voltage are good and the DTCs \(U11E3 \- TCM Lost communication with ESM on D\-PT CAN \& U0103 \- Lost communication with Electric Gear Shift Module\) are still present, erase them with the scan tool. Reset ECU. 5. if DTCs for loss communication are still active at the ESM and you are still unable to shift then replace the Shifter module.
- [21\-016\-25 REV. C](/bulletins/11022007.md), 2025-08-21, Service bulletin: POWER TRAIN. Valve Body 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 \(DTCs\): ● U0101 \- Lost Communication With The Transmission Control Module \(TCM\). ● U0402 \- Implausible Data Received From TCM. ● U0418 \- Implausible Data Received From Brake System Control Module 1. Customers may also comment on the following: ● Vehicle will go in limp\-in mode. After the vehicle enters limp\-in mode and has been shifted into Park, the vehicle will not shift into a forward or reverse gear This bulletin involves replacing the transmission valve body assembly.
- [9100641](/bulletins/11021842.md), 2025-08-13, Service bulletin: POWER TRAIN. 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.
- [21\-016\-25 REV. B](/bulletins/11021838.md), 2025-08-13, Service bulletin: POWER TRAIN. Valve Body 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 \(DTCs\): ● U0101 \- Lost Communication With The Transmission Control Module \(TCM\). ● U0402 \- Implausible Data Received From TCM. ● U0418 \- Implausible Data Received From Brake System Control Module 1. Customers may also comment on the following: ● Vehicle will go in limp\-in mode. After the vehicle enters limp\-in mode and has been shifted into Park, the vehicle will not shift into a forward or reverse gear. This bulletin involves replacing the transmission valve body assembly.
- [9100576](/bulletins/11018658.md), 2025-05-29, Service bulletin: POWER TRAIN. Transfer Case Motor Gear: Confirm the attachment points from the wiring routes when they inspect a shift motor on the t\-case. Review the connection of the connector X238A, make sure it's fully seated and that the lever is fully locked on the connector.
- [21\-016\-25 REV. A](/bulletins/11018490.md), 2025-05-20, Service bulletin: POWER TRAIN. "Valve Body 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 \(DTCs\): ● U0101 \- Lost Communication With The Transmission Control Module \(TCM\). ● U0402 \- Implausible Data Received From TCM. ● U0418 \- Implausible Data Received From Brake System Control Module 1. Customers may also comment on the following: ● Vehicle will go in limp\-in mode. After the vehicle enters limp\-in mode and has been shifted into Park, the vehicle will not shift into a forward or reverse gear This bulletin involves replacing the transmission valve body assembly."
- [18\-023\-25](/bulletins/11018125.md), 2025-05-07, 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 or more of the following Diagnostic Trouble Codes \(DTCs\): ● P1CEA \- Boost Side EVAP Purge System Performance. ● P2AF6 \- Dual Starter Relay Stuck. ● P026E \- Charge Air Cooler Coolant Pump Performance. Customers may also comment on one or more of the following: ● Low battery State of Charge \(SoC\) leading to battery replacement. ● Vehicle does not restart after an Engine Stop Start \(ESS\) event but will restart after an ignition cycl This bulletin involves reprogramming the PCM with the latest available software."

JSON: [/v1/bulletins/11018020](/v1/bulletins/11018020)

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