# Service bulletin 18\-077\-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: 11021837
- Published by NHTSA: 2025\-08\-13
- Manufacturer's number: 18\-077\-25
- Manufacturer's date: 2025\-08\-05
- NHTSA component: UNKNOWN OR OTHER

## 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 \(DTCs\):\*\* ● \*\*U0104\-00 \- Lost Communication With Cruise Control Module. \(NA Market Only\) ● U0405\-00 \- Invalid Data Received From Cruise Control Module. \(NA Market Only\)\*\* ● P018B \- Fuel Pressure Sensor "B" Circuit Range/Performance. ● P00C6 \- Fuel Rail Pressure Too Low \- Engine Cranking Bank 1. ● P06DD \- Engine Oil Pressure Control Circuit Performance/Stuck Off. ● P0461 \- Fuel Level Sensor "A" Circuit Range/Performance. ● P2C90\-00 \- Crankcase Ventilation System \- Hose "A" Disconnected. ● P0604\-00 \- Internal Control Module Random Access Memory Ram Error. ● P060C\-00 \- Internal Control Module Main Processor Performance. Customer may also experience one or more of the following: ● Undesirable vehicle drivability behavior causing a Shift to Park event during Engine Stop Start \(ESS\) while Adaptive Cruise Control \(ACC\) is active. ● Pressing the ACC button while ESS is active can shift the vehicle to park. ● Idle speed oscillations observed when in "Snow" and "Mud" modes. ● Poor engine performance \(undershoots engine speed\) for ESS and for non\-ESS engine start. ● Screen two incorrectly pops up on the Instrument Cluster Panel \(IPC\) for five seconds during "Terrain" and "Rock" mode. ● Poor or reduced Air Conditioning \(A/C\) performance during wide open throttle or heavy acceleration. \*\*In addition, the following software enhancement is available: ● Software update to prevent false DTC detection of U0104\-00, U0405\-00 and P018B. \(NA Market Only\)\* 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-11021837-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11021837-9999.pdf)

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

## Trouble codes named

P00C6, P018B, P0461, P0604, P060C, P06DD, P2C90, U0104, U0405

## Vehicles listed

- 2023 JEEP GRAND WAGONEER
- 2023 JEEP WAGONEER

JSON: [/v1/bulletins/11021837](/v1/bulletins/11021837)

[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%2018-077-25&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11021837&vehicle=Service%20bulletin%2018-077-25)