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Service bulletins for the 2023 Jeep Wagoneer

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.

558 on file from NHTSA, as of 2026-10-19.

About P0604 on the 2023 Jeep Wagoneer: what the code means, and the bulletins and recalls about the same components.

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By component

By trouble code

Only bulletins with trouble code: P0604 are shown. Show all

Bulletins, newest first
18-043-262026-03-25. Service bulletin. ENGINE. 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): ● **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) ● P06DD-00 - Engine Oil Pressure Control Circuit Performance/stuck Off. (In Active or Stored status) ● P05BD-00 - Stop-Start Mode Switch Range/Performance. (In Active or Stored status) ● P0116-00 - Engine Coolant Temperature Sensor 1 Performance. (In Active or Stored status) ● P062B-00 - Internal Control Module Fuel Injector Control Performance. (In Active or Stored status) ● P018B-00 - Fuel Pressure Sensor "B" Circuit Range/Performance. (In Active or Stored status)** ● 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)** ● P018B-00 - Fuel Pressure Sensor "B" Circuit Range/Performance. **(In Active or Stored status)** ● P00C6-00 - Fuel Rail Pressure Too Low - Engine Cranking Bank 1. **(In Active or Stored status)** ● P06DD-00 - Engine Oil Pressure Control Circuit Performance/Stuck Off. **(In Active or Stored status)** ● P0461-00 - Fuel Level Sensor "A" Circuit Range/Performance. **(In Active or Stored status)** ● P2C90-00 - Crankcase Ventilation System - Hose "A" Disconnected. **(In Active or Stored status)** ● P0604
18-041-262026-03-25. Service bulletin. ENGINE. 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): ● **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). ● P018B-00 - Fuel Pressure Sensor "B" Circuit Range/Performance (In Active or Stored status). ● P00F3-00 - Humidity Sensor Circuit Range - Performance (In Active or Stored status). ● P0604-00 - Internal Control Module Random Access Memory RAM Error (In Active or Stored status). ● P060C-00 - Internal Control Module Main Processor Performance (In Active or Stored status). ● P0300 - Mul
18-044-262026-03-25. Service bulletin. ENGINE. 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): ● **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) ● P05BD-00 - Stop-Start Mode Switch Range/Performance. (In Active or Stored status) ● P0116-00 - Engine Coolant Temperature Sensor 1 Performance. (In Active or Stored status) ● P062B-00 - Internal Control Module Fuel Injector Control Performance. (In Active or Stored status) ● P0604-00 - Internal Control Module Random Access Memory Ram Error. (In Active or Stored status) ● P060C-00 - Internal Control Module Main Processor Performance. (In Active or Stored status)** ● P018B-00 - Fuel Pressure Sensor "B" Circuit Range/performance. **(In Active or Stored status)** ● P1CEA-00 - Boost Side EVAP Purge System Performance. **(In Active or Stored status)** ● P06DD-00 - Engine Oil Pressure Control Circuit Performance/Stuck Off. **(In Active or Stored status)** ● P00C6-00 - Fuel Rail Pressure Too Low - Engine Cranking. **(In Active or Stored status)** ● P0300-00 - Multiple Cylinder Misfire. **(In Active or Stored status)** Customers may also experience one or more of the following: ● **Oil Level High Warning in the Instrument Panel Cluster (IPC).** ● Fully Autonomous Parking Assist (FAPA) is not deactivated when accelerator pedal is pressed. ● Vehicle is not heating up fast enough at freezi
18-043-262026-03-25. Service bulletin. ENGINE. 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): ● **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) ● P06DD-00 - Engine Oil Pressure Control Circuit Performance/stuck Off. (In Active or Stored status) ● P05BD-00 - Stop-Start Mode Switch Range/Performance. (In Active or Stored status) ● P0116-00 - Engine Coolant Temperature Sensor 1 Performance. (In Active or Stored status) ● P062B-00 - Internal Control Module Fuel Injector Control Performance. (In Active or Stored status) ● P018B-00 - Fuel Pressure Sensor "B" Circuit Range/Performance. (In Active or Stored status)** ● 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)** ● P018B-00 - Fuel Pressure Sensor "B" Circuit Range/Performance. **(In Active or Stored status)** ● P00C6-00 - Fuel Rail Pressure Too Low - Engine Cranking Bank 1. **(In Active or Stored status)** ● P06DD-00 - Engine Oil Pressure Control Circuit Performance/Stuck Off. **(In Active or Stored status)** ● P0461-00 - Fuel Level Sensor "A" Circuit Range/Performance. **(In Active or Stored status)** ● P2C90-00 - Crankcase Ventilation System - Hose "A" Disconnected. **(In Active or Stored status)** ● P0604
18-041-262026-03-25. Service bulletin. ENGINE. 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): ● **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). ● P018B-00 - Fuel Pressure Sensor "B" Circuit Range/Performance (In Active or Stored status). ● P00F3-00 - Humidity Sensor Circuit Range - Performance (In Active or Stored status). ● P0604-00 - Internal Control Module Random Access Memory RAM Error (In Active or Stored status). ● P060C-00 - Internal Control Module Main Processor Performance (In Active or Stored status). ● P0300 - Mul
18-077-252025-08-13. Service bulletin. UNKNOWN OR OTHER. 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.
18-076-252025-08-13. Service bulletin. UNKNOWN OR OTHER. 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.
18-004-24 REV. B2024-08-13. Service bulletin. POWER TRAIN. "Flash: Powertrain Control Module (PCM) Updates Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble Codes (DTCs) have been set: ● **P00F3-00 - Humidity Sensor Circuit Range-performance.** ● P00C6-00 - Fuel Rail Pressure Too Low - Engine Cranking. ● P06DD-00 - Engine Oil Pressure Control Circuit Performance/Stuck Off. ● P0461-00 - Fuel Level Sensor ""A"" Circuit Range/Performance. ● P051B-00 - Crankcase Pressure Sensor Circuit Range/Performance. ● P2F64-00 - Ion Sense Feedback Circuit A. ● P0331-00 - Knock Sensor 2 Circuit Range/Performance. ● P0300-00 - Multiple Cylinder Misfire. ● P2C90-00 - Crankcase Ventilation System - Hose ""A"" Disconnected. ● P0011-00 - Bank 1 Camshaft 1 Position Timing Over Advanced Or System Performance. ● P0604-00 - Internal Control Module Random Access Memory Ram Error. ● P060C-00 - Internal Control Module Main Processor Performance. **Customers may also comment on the following: ● Undesirable vehicle drivability behavior causing the a Shift to Park event during Engine Stop Start (ESS) while Adaptive Cruise Control (ACC) is active. ● Pressing ACC button while ESS 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 5 seconds during Terrain and Rock mode. ● Vehicle performance complaints when coasting at lower speeds.** This bulletin involves reprogramming the PCM with the latest available software."
18004242024-03-18. Service bulletin. BACK OVER PREVENTION; ELECTRICAL SYSTEM; FUEL SYSTEM, GASOLINE; SERVICE BRAKES; EXTERIOR LIGHTING. Flash: Powertrain Control Module (PCM) Updates Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble Codes (DTCs) have been set: ? **P00C6-00 - Fuel Rail Pressure Too Low - Engine Cranking. ? P06DD-00 - Engine Oil Pressure Control Circuit Performance/Stuck Off. ? P0461-00 - Fuel Level Sensor "A" Circuit Range/Performance. ? P051B-00 - Crankcase Pressure Sensor Circuit Range/Performance. ? P2F64-00 - Ion Sense Feedback Circuit A. ? P0331-00 - Knock Sensor 2 Circuit Range/Performance. ? P0300-00 - Multiple Cylinder Misfire.** ? P2C90-00 - Crankcase Ventilation System - Hose "A" Disconnected. ? P0011-00 - Bank 1 Camshaft 1 Position Timing Over Advanced Or System Performance. ? 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.
18003242024-03-18. Service bulletin. ELECTRICAL SYSTEM; FUEL SYSTEM, GASOLINE; POWER TRAIN:MANUAL TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). Flash: Powertrain Control Module (PCM) Updates Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble Codes (DTCs) have been set: ? **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. This bulletin involves reprogramming the PCM with the latest available software.
18105232024-01-16. Service bulletin. ELECTRICAL SYSTEM; EXTERIOR LIGHTING; FUEL SYSTEM, GASOLINE. Flash: Powertrain Control Module (PCM) Updates Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble Codes (DTCs) have been set: ? P2C90-00 - Crankcase Ventilation System - Hose "A" Disconnected. ? P0011-00 - Bank 1 Camshaft 1 Position Timing Over Advanced Or System Performance. ? 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.
18104232023-12-18. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). Flash: Powertrain Control Module (PCM) Updates Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble Codes (DTCs) have been set: ? 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. This bulletin involves reprogramming the PCM with the latest available software.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.