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Jeep U0422

If multiple LOC DTCs are present: a. Check battery health, system voltage, and TCM (including valve body). b. If TC

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceService is appropriate if U0422 is stored, especially when multiple LOC DTCs are present. The verified manufacturer communication provides a technician diagnostic direction but does not establish urgency, drivability, or charging restrictions.
Confidence95%

Quick answer

For Jeep Grand Cherokee and Wagoneer vehicles in the US model years 2024–2026, U0422 is identified in an official manufacturer communication as a relevant code when diagnosing loss-of-communication (LOC) DTCs. If multiple LOC DTCs are present, the communication directs technicians to check battery health, system voltage, and the TCM, including the valve body.

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 U0422 mean?

For Jeep Grand Cherokee and Wagoneer vehicles in the US model years 2024–2026, U0422 is identified in an official manufacturer communication as a relevant code when diagnosing loss-of-communication (LOC) DTCs. If multiple LOC DTCs are present, the communication directs technicians to check battery health, system voltage, and the TCM, including the valve body.

2. Technical explanation

The verified evidence does not provide a complete generic definition of U0422. It does establish that U0422 is among relevant DTCs in a manufacturer diagnostic communication addressing LOC DTCs. The same communication states that, when multiple LOC DTCs are present, battery health, system voltage, and the transmission control module (TCM), including its valve body, should be checked. It also states that where modules are on the same LOC, the ESM is not the cause because it is not a gateway module.

3. What system is affected?

Communication-network diagnosis and, under the stated multiple-LOC condition, battery/system-voltage and TCM/valve-body evaluation.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • Not yet established by verified evidence.

6. Possible causes

  • When multiple LOC DTCs are present, the official communication directs checks of battery health, system voltage, and the TCM, including the valve body.
  • The communication states that the ESM is not the cause when modules are on the same LOC because it is not a gateway module.

7. Can I still drive the vehicle?

Not yet established by verified evidence.

8. Can I charge the vehicle?

Not yet established by verified evidence.

9. What you can safely do

  • Have a qualified technician retrieve and review all stored DTCs, particularly whether multiple LOC DTCs are present.
  • Use the applicable manufacturer diagnostic process to assess battery health, system voltage, and the TCM including the valve body when multiple LOC DTCs are present.
  • Do not assume the ESM is the cause solely because modules share the same LOC; the official communication states that it is not a gateway module.

10. Step-by-step troubleshooting

  1. Read all DTCs.
  2. Determine whether multiple LOC DTCs are present.
  3. If multiple LOC DTCs are present, check battery health.
  4. If multiple LOC DTCs are present, check system voltage.
  5. If multiple LOC DTCs are present, check the TCM, including the valve body.

11. When to contact service

Service is appropriate if U0422 is stored, especially when multiple LOC DTCs are present. The verified manufacturer communication provides a technician diagnostic direction but does not establish urgency, drivability, or charging restrictions.

12. What the service center may check

  • Retrieve and assess all DTCs, including other LOC DTCs.
  • Check battery health when multiple LOC DTCs are present.
  • Check system voltage when multiple LOC DTCs are present.
  • Check the TCM, including the valve body, when multiple LOC DTCs are present.

13. Possible repair or resolution

  • Not yet established by verified evidence. The supplied official communication identifies diagnostic checks, not a confirmed repair outcome.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA Manufacturer Communication 11021842: 9100641, published August 5, 2025. It lists U0422 as a relevant code and directs checks of battery health, system voltage, and the TCM including valve body if multiple LOC DTCs are present.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified source: NHTSA Manufacturer Communication 11021842: 9100641, published 2025-08-05. https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2025-2026.zip#nhtsa_id=11021842

19. Frequently asked questions

What does U0422 mean on an applicable Jeep?

The supplied verified evidence does not provide a complete standalone definition. It identifies U0422 as a relevant DTC in a manufacturer communication concerning LOC DTC diagnosis.

What should be checked if U0422 appears with multiple LOC DTCs?

The official communication directs checks of battery health, system voltage, and the TCM, including the valve body.

Is the ESM the cause of a same-LOC issue?

According to the supplied communication, the ESM is not the cause when modules are on the same LOC because it is not a gateway module.

Does U0422 mean the vehicle is unsafe to drive or charge?

Not yet established by verified evidence.

20. Sources & verification

ReferenceVerified
Jeep U0422: If multiple LOC DTCs are present: a. Check battery health,… | EV Diagnostics