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Jeep U145D

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

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceService evaluation is appropriate because the verified bulletin directs diagnostic checks of battery health, system voltage, and the TCM/valve body when multiple LOC DTCs are present.
Confidence95%

Quick answer

For Jeep vehicles covered by the verified bulletin, U145D is listed as a relevant DTC in a loss-of-communication (LOC) diagnostic process. When multiple LOC DTCs are present, the bulletin 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.

Video guides

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DTC Jeep U145D Short ExplanationMaxidot Jeep

Videos are supporting material and never override OEM or regulator evidence.

1. What does U145D mean?

For Jeep vehicles covered by the verified bulletin, U145D is listed as a relevant DTC in a loss-of-communication (LOC) diagnostic process. When multiple LOC DTCs are present, the bulletin directs technicians to check battery health, system voltage, and the TCM, including the valve body.

2. Technical explanation

Verified evidence identifies U145D as a relevant code in NHTSA Manufacturer Communication 11021842 / 9100641. The available bulletin excerpt states that, if multiple LOC DTCs are present, technicians should check battery health, system voltage, and the transmission control module (TCM), including the valve body. It also states that if the TCM goes offline, further ESM-related diagnostic action is referenced, but the supplied evidence is truncated and does not establish the complete instruction.

3. What system is affected?

A loss-of-communication diagnostic process involving the TCM and, where applicable, the valve body. The supplied evidence also references battery health and system voltage.

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 verified bulletin directs checks of battery health, system voltage, and the TCM, including the valve body.
  • The supplied evidence does not establish a specific root cause for U145D alone.

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 the vehicle evaluated by a qualified Jeep service technician, particularly if U145D is accompanied by multiple loss-of-communication DTCs.
  • Record all stored DTCs before they are cleared, because the verified bulletin specifically distinguishes cases with multiple LOC DTCs.
  • Do not perform high-voltage, battery, TCM, or valve-body repair procedures without qualified service support.

10. Step-by-step troubleshooting

  1. Read and document all DTCs.
  2. If multiple LOC DTCs are present, check battery health.
  3. Check system voltage.
  4. Inspect and diagnose the TCM, including the valve body, as directed by the applicable service procedure.
  5. The supplied evidence references an ESM-related step if the TCM goes offline, but the full step is not established by the provided evidence.

11. When to contact service

Service evaluation is appropriate because the verified bulletin directs diagnostic checks of battery health, system voltage, and the TCM/valve body when multiple LOC DTCs are present.

12. What the service center may check

  • Retrieve all diagnostic trouble codes and determine whether multiple LOC DTCs are present.
  • Check battery health.
  • Check system voltage.
  • Check the TCM, including the valve body.
  • If the TCM goes offline, follow the applicable ESM diagnostic procedure; the supplied evidence does not provide the complete procedure.

13. Possible repair or resolution

  • Not yet established by verified evidence. The supplied bulletin excerpt provides diagnostic direction but does not establish a confirmed repair for U145D.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA Manufacturer Communication 11021842, identified as 9100641, published August 5, 2025. It lists U145D among relevant DTCs and directs checks of battery health, system voltage, and the TCM including valve body when multiple LOC DTCs are present.

16. Recall information

No recall relationship is established by verified evidence.

17. Official manufacturer information

Verified official source: NHTSA Manufacturer Communication 11021842: 9100641, published August 5, 2025: https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2025-2026.zip#nhtsa_id=11021842

19. Frequently asked questions

What does U145D mean on a covered Jeep?

The supplied verified evidence lists U145D as a relevant DTC in a loss-of-communication diagnostic process. It does not provide a complete standalone definition for U145D.

Which vehicles are covered by the verified evidence?

Jeep Grand Cherokee model years 2024 through 2026 in the United States, and Jeep Wagoneer model years 2024 through 2026 in the United States.

What should be checked when U145D appears with multiple LOC DTCs?

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

Is it safe to drive or charge with U145D?

Not yet established by verified evidence.

20. Sources & verification

Verified
Jeep U145D: If multiple LOC DTCs are present: a. Check battery health,… | EV Diagnostics