{"nhtsa_id":11021837,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-08-13","date":"2025-08-05","document_id":"18-077-25","mfr_campaign":null,"replaces":null,"component":"UNKNOWN OR OTHER","mfr_system":null,"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11021837-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11021837-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11021837","components":[],"codes":["P00C6","P018B","P0461","P0604","P060C","P06DD","P2C90","U0104","U0405"],"topics":[],"vehicles":[{"make":"JEEP","model":"GRAND WAGONEER","year_from":2023,"year_to":2023,"match":"exact","vehicle_ids":["2023_jeep_grand-wagoneer"]},{"make":"JEEP","model":"WAGONEER","year_from":2023,"year_to":2023,"match":"exact","vehicle_ids":["2023_jeep_wagoneer"]}],"as_of":"2026-10-19","note":"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.","attribution":[]}