# U0673 on the 2025 Jeep Wagoneer

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

Nobody has written a description of this code yet.

## Bulletins for this model year that name U0673

- [11038540](https://open.wenmarpro.com/bulletins/11038540), 2026-10-16: 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 \(DTCs\): ● \*\*P2237\-00 \- O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 1. ● P2240\-00 \- O2 Sensor Positive Current Control Circuit/Open Bank 2 Sensor 1. ● P2251\-00 \- O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 1. ● P2254\-00 \- O2 Sensor Negative Current Control Circuit/Open Bank 2 Sensor 1. ● P2243\-00 \- O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1. ● P2247\-00 \- O2 Sensor Reference Voltage Circuit/Open Bank 2 Sensor 1. ● P015B\-00 \- O2 Sensor Delayed Response \- Lean To Rich Bank 1 Sensor 1. ● P015D\-00 \- O2 Sensor Delayed Response \- Lean To Rich Bank 2 Sensor 1. ● P2AF6\-00 \- Starter Relay 3 Stuck Off. ● P0E7C\-00 \- Coolant Bypass Valve "B" Control Circuit Low. ● P0E7D\-00 \- Coolant Bypass Valve "B" Control Circuit High. ● P0E7E\-00 \- Coolant Bypass Valve "B" Control Circuit Range/Performance. ● P0E7F\-00 \- Coolant Bypass Valve "B" Control Circuit Stuck/Open. ● U063C\-00 \- Lost Communication With Coolant Bypass Valve Actuator "B". ● P0100\-00 \- Mass Or Volume Air Flow Sensor "A" Circuit. ● P0101\-00 \- Mass Or Volume Air Flow Sensor "A" Circuit Range/Performance. ● P0461\-00 \- Fuel Level Sensor "A" Circuit Range/performance. ● P0073\-00 \- Ambient Air Temperature Sensor Circuit "A" High. ● P0072\-00 \- Ambient Air Temperature Sensor Circuit "A" Low. ● P062B\-00 \- Internal Control Module Fuel Injector Control Performance. ● B1810\-00 \- Driver Door Shorted Low. ● B25C7\-00 \- Redundant Driver Door Shorted Low.\*\* ● U0673\-00 \- Lost Communication With Ion Sense Module \(in active or stored status\). ● P00C6\-00 \- Fuel Rail Pressure Too Low \- Engine Cranking \(in active or stored status\). ● P2C90\-00 \- Crankcase Ventilation System \- Hose "A" Disconnected \(in active or stored status\). This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software.
- [11038539](https://open.wenmarpro.com/bulletins/11038539), 2026-10-16: 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 \(DTCs\): ● \*\*P2237\-00 \- O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 1. ● P2240\-00 \- O2 Sensor Positive Current Control Circuit/Open Bank 2 Sensor 1. ● P2251\-00 \- O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 1. ● P2254\-00 \- O2 Sensor Negative Current Control Circuit/Open Bank 2 Sensor 1. ● P2243\-00 \- O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1. ● P2247\-00 \- O2 Sensor Reference Voltage Circuit/Open Bank 2 Sensor 1. ● P015B\-00 \- O2 Sensor Delayed Response \- Lean To Rich Bank 1 Sensor 1. ● P015D\-00 \- O2 Sensor Delayed Response \- Lean To Rich Bank 2 Sensor 1. ● P2AF6\-00 \- Starter Relay 3 Stuck Off. ● P0E7C\-00 \- Coolant Bypass Valve "B" Control Circuit Low. ● P0E7D\-00 \- Coolant Bypass Valve "B" Control Circuit High. ● P0E7E\-00 \- Coolant Bypass Valve "B" Control Circuit Range/Performance. ● P0E7F\-00 \- Coolant Bypass Valve "B" Control Circuit Stuck/Open. ● U063C\-00 \- Lost Communication With Coolant Bypass Valve Actuator "B". ● P0100\-00 \- Mass Or Volume Air Flow Sensor "A" Circuit. ● P0101\-00 \- Mass Or Volume Air Flow Sensor "A" Circuit Range/Performance. ● P0461\-00 \- Fuel Level Sensor "A" Circuit Range/performance. ● P0073\-00 \- Ambient Air Temperature Sensor Circuit "A" High. ● P0072\-00 \- Ambient Air Temperature Sensor Circuit "A" Low. ● P062B\-00 \- Internal Control Module Fuel Injector Control Performance. ● B1810\-00 \- Driver Door Shorted Low. ● B25C7\-00 \- Redundant Driver Door Shorted Low.\*\* ● U0673\-00 \- Lost Communication With Ion Sense Module \(in active or stored status\). ● P00C6\-00 \- Fuel Rail Pressure Too Low \- Engine Cranking \(in active or stored status\). ● P2C90\-00 \- Crankcase Ventilation System \- Hose "A" Disconnected \(in active or stored status\). This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software.
- [11038503](https://open.wenmarpro.com/bulletins/11038503), 2026-10-16: 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 \(DTCs\): ● \*\*P2237\-00 \- O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 1. ● P2240\-00 \- O2 Sensor Positive Current Control Circuit/Open Bank 2 Sensor 1. ● P2251\-00 \- O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 1. ● P2254\-00 \- O2 Sensor Negative Current Control Circuit/Open Bank 2 Sensor 1. ● P2243\-00 \- O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1. ● P2247\-00 \- O2 Sensor Reference Voltage Circuit/Open Bank 2 Sensor 1. ● P015B\-00 \- O2 Sensor Delayed Response \- Lean To Rich Bank 1 Sensor 1. ● P015D\-00 \- O2 Sensor Delayed Response \- Lean To Rich Bank 2 Sensor 1. ● P2AF6\-00 \- Starter Relay 3 Stuck Off. ● P0E7C\-00 \- Coolant Bypass Valve "B" Control Circuit Low. ● P0E7D\-00 \- Coolant Bypass Valve "B" Control Circuit High. ● P0E7E\-00 \- Coolant Bypass Valve "B" Control Circuit Range/Performance. ● P0E7F\-00 \- Coolant Bypass Valve "B" Control Circuit Stuck/Open. ● U063C\-00 \- Lost Communication With Coolant Bypass Valve Actuator "B". ● P0100\-00 \- Mass Or Volume Air Flow Sensor "A" Circuit. ● P0101\-00 \- Mass Or Volume Air Flow Sensor "A" Circuit Range/Performance. ● P0461\-00 \- Fuel Level Sensor "A" Circuit Range/performance. ● P0073\-00 \- Ambient Air Temperature Sensor Circuit "A" High. ● P0072\-00 \- Ambient Air Temperature Sensor Circuit "A" Low. ● P062B\-00 \- Internal Control Module Fuel Injector Control Performance. ● B1810\-00 \- Driver Door Shorted Low. ● B25C7\-00 \- Redundant Driver Door Shorted Low.\*\* ● U0673\-00 \- Lost Communication With Ion Sense Module \(in active or stored status\). ● P00C6\-00 \- Fuel Rail Pressure Too Low \- Engine Cranking \(in active or stored status\). ● P2C90\-00 \- Crankcase Ventilation System \- Hose "A" Disconnected \(in active or stored status\). This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software.
- [11038502](https://open.wenmarpro.com/bulletins/11038502), 2026-10-16: 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 \(DTCs\): ● \*\*P2237\-00 \- O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 1. ● P2240\-00 \- O2 Sensor Positive Current Control Circuit/Open Bank 2 Sensor 1. ● P2251\-00 \- O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 1. ● P2254\-00 \- O2 Sensor Negative Current Control Circuit/Open Bank 2 Sensor 1. ● P2243\-00 \- O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1. ● P2247\-00 \- O2 Sensor Reference Voltage Circuit/Open Bank 2 Sensor 1. ● P015B\-00 \- O2 Sensor Delayed Response \- Lean To Rich Bank 1 Sensor 1. ● P015D\-00 \- O2 Sensor Delayed Response \- Lean To Rich Bank 2 Sensor 1. ● P2AF6\-00 \- Starter Relay 3 Stuck Off. ● P0E7C\-00 \- Coolant Bypass Valve "B" Control Circuit Low. ● P0E7D\-00 \- Coolant Bypass Valve "B" Control Circuit High. ● P0E7E\-00 \- Coolant Bypass Valve "B" Control Circuit Range/Performance. ● P0E7F\-00 \- Coolant Bypass Valve "B" Control Circuit Stuck/Open. ● U063C\-00 \- Lost Communication With Coolant Bypass Valve Actuator "B". ● P0100\-00 \- Mass Or Volume Air Flow Sensor "A" Circuit. ● P0101\-00 \- Mass Or Volume Air Flow Sensor "A" Circuit Range/Performance. ● P0461\-00 \- Fuel Level Sensor "A" Circuit Range/performance. ● P0073\-00 \- Ambient Air Temperature Sensor Circuit "A" High. ● P0072\-00 \- Ambient Air Temperature Sensor Circuit "A" Low. ● P062B\-00 \- Internal Control Module Fuel Injector Control Performance. ● B1810\-00 \- Driver Door Shorted Low. ● B25C7\-00 \- Redundant Driver Door Shorted Low.\*\* ● U0673\-00 \- Lost Communication With Ion Sense Module \(in active or stored status\). ● P00C6\-00 \- Fuel Rail Pressure Too Low \- Engine Cranking \(in active or stored status\). ● P2C90\-00 \- Crankcase Ventilation System \- Hose "A" Disconnected \(in active or stored status\). This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software.
- [11026797](https://open.wenmarpro.com/bulletins/11026797), 2025-12-23: 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 \(DTCs\): ● \*\*U0673\-00 \- Lost Communication With Ion Sense Module \(in active or stored status\). ● P00C6\-00 \- Fuel Rail Pressure Too Low \- Engine Cranking \(in active or stored status\). ● P2C90\-00 \- Crankcase Ventilation System \- Hose "A" Disconnected \(in active or stored status\). ● P0116\-00 \- Engine Coolant Temperature Sensor 1 Performance \(in active or stored status\). ● 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 \(in active or stored status\).\*\* ● P1CEA \- Boost Side EVAP Purge System Performance \*\*\(in active or stored status\).\*\* ● P2AF6 \- Dual Starter Relay Stuck \*\*\(in active or stored status\).\*\* ● P026E \- Charge Air Cooler Coolant Pump Performance \*\*\(in active or stored status\).\*\* Customers may also comment on one or more of the following: ● \*\*Oil Level High Warning in the Instrument Panel Cluster \(IPC\). ● Engine will not start.\*\* ● 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 cycle. This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software.
- [11026796](https://open.wenmarpro.com/bulletins/11026796), 2025-12-23: 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 \(DTCs\): ● \*\*U0673\-00 \- Lost Communication With Ion Sense Module \(in active or stored status\). ● P00C6\-00 \- Fuel Rail Pressure Too Low \- Engine Cranking \(in active or stored status\). ● P2C90\-00 \- Crankcase Ventilation System \- Hose "A" Disconnected \(in active or stored status\). ● P0116\-00 \- Engine Coolant Temperature Sensor 1 Performance \(in active or stored status\). ● 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 \(in active or stored status\).\*\* ● P1CEA \- Boost Side EVAP Purge System Performance \*\*\(in active or stored status\).\*\* ● P2AF6 \- Dual Starter Relay Stuck \*\*\(in active or stored status\).\*\* ● P026E \- Charge Air Cooler Coolant Pump Performance \*\*\(in active or stored status\).\*\* Customers may also comment on one or more of the following: ● \*\*Oil Level High Warning in the Instrument Panel Cluster \(IPC\). ● Engine will not start.\*\* ● 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 cycle. This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software.