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Jeep U0673

Lost Communication With Ion Sense Module (in active or stored status)

DriveUnknown. The supplied diagnostic record does not establish whether the vehicle is safe to drive.
ChargeUnknown. The supplied diagnostic record does not establish whether charging is safe or applicable.
ServiceContact an authorized Jeep dealer or qualified service provider for diagnosis, particularly if the MIL is illuminated and U0673 is active or stored.
Confidence95%

Quick answer

U0673 indicates lost communication with the Ion Sense Module, recorded in active or stored status. Verified applicability is limited to the 2025 Jeep Wagoneer in the United States.

This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.

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1. What does U0673 mean?

U0673 indicates lost communication with the Ion Sense Module, recorded in active or stored status. Verified applicability is limited to the 2025 Jeep Wagoneer in the United States.

2. Technical explanation

The verified diagnostic meaning is: “Lost Communication With Ion Sense Module (in active or stored status).” This is a communication-related DTC. The supplied official manufacturer communications list U0673-00 among DTCs that may be present when the Malfunction Indicator Lamp (MIL) is illuminated. No further root-cause or repair detail is established by the supplied evidence.

3. What system is affected?

Ion Sense Module communication. The specific vehicle system classification is not otherwise established by verified evidence.

4. How serious is this code?

Unknown. The supplied diagnostic record does not establish severity.

5. Symptoms you may notice

  • Malfunction Indicator Lamp (MIL) illumination is identified in the supplied official manufacturer communication.
  • Whether other symptoms occur is not yet established by verified evidence.

6. Possible causes

  • Loss of communication with the Ion Sense Module is the verified code meaning.
  • The underlying cause of that communication loss is not yet established by verified evidence.

7. Can I still drive the vehicle?

Unknown. The supplied diagnostic record does not establish whether the vehicle is safe to drive.

8. Can I charge the vehicle?

Unknown. The supplied diagnostic record does not establish whether charging is safe or applicable.

9. What you can safely do

  • Arrange diagnosis by an authorized Jeep service provider if the MIL is illuminated and U0673 is present.
  • Do not attempt high-voltage or module repair procedures based on this information.

10. Step-by-step troubleshooting

  1. Confirm the exact stored or active DTC with a suitable diagnostic scan tool.
  2. Have a qualified service provider evaluate the vehicle using the applicable manufacturer diagnostic information.
  3. No specific wiring, connector, module, or programming procedure is established by the supplied evidence.

11. When to contact service

Contact an authorized Jeep dealer or qualified service provider for diagnosis, particularly if the MIL is illuminated and U0673 is active or stored.

12. What the service center may check

  • Retrieve and document active and stored DTCs.
  • Evaluate U0673 using applicable Jeep manufacturer diagnostic information.
  • The exact service checks are not yet established by verified evidence.

13. Possible repair or resolution

  • A specific repair resolution is not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA Manufacturer Communication 11026796: 18-022-25 REV. A, published December 17, 2025. It identifies MIL illumination and lists U0673-00 among DTCs that may be exhibited/set.
  • NHTSA Manufacturer Communication 11026797: 18-023-25 REV. A, published December 17, 2025. It identifies MIL illumination and lists U0673-00 among DTCs that may be exhibited/set.

16. Recall information

  • No recall information was supplied or established by verified evidence.

17. Official manufacturer information

Verified applicability: 2025 Jeep Wagoneer, United States. Official source: NHTSA manufacturer communications 11026796 and 11026797, both published December 17, 2025. https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2025-2026.zip#nhtsa_id=11026796 ; https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2025-2026.zip#nhtsa_id=11026797

19. Frequently asked questions

What does Jeep code U0673 mean?

It means “Lost Communication With Ion Sense Module (in active or stored status).”

Which vehicles are verified for this code entry?

The supplied evidence verifies applicability for the 2025 Jeep Wagoneer in the United States.

Does U0673 illuminate the check-engine light?

The supplied official manufacturer communications identify MIL illumination and list U0673-00 among DTCs that may be exhibited or set.

Is it safe to drive with U0673?

Not yet established by verified evidence.

What repair fixes U0673?

Not yet established by verified evidence.

20. Sources & verification

ReferenceVerified
Jeep U0673: Lost Communication With Ion Sense Module (in active or… | EV Diagnostics