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Jeep U0402

Implausible data received from TCM **NOTE: Prior any shifter replacement Refer to TSB-4582 2024-2025 WS - Valve Body Replacement. Recomen

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceService is recommended because U0402 concerns implausible TCM data and the supplied manufacturer communications provide diagnostic and bulletin guidance. The urgency and drivability impact are not established by the supplied evidence.
Confidence95%

Quick answer

U0402 indicates implausible data received from the Transmission Control Module (TCM). For certain 2024–2025 WS vehicles, the verified manufacturer communication says to refer to TSB 21-016-25 concerning valve-body replacement before replacing a shifter.

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

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Unraveling Jeep Code U0402Car_Fix_DTC

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1. What does U0402 mean?

U0402 indicates implausible data received from the Transmission Control Module (TCM). For certain 2024–2025 WS vehicles, the verified manufacturer communication says to refer to TSB 21-016-25 concerning valve-body replacement before replacing a shifter.

2. Technical explanation

The supplied verified evidence defines U0402 as “Implausible Data Received From TCM.” It is a communication/data-plausibility diagnostic code involving information received from the Transmission Control Module. The evidence does not establish a single failed part from U0402 alone.

3. What system is affected?

Transmission Control Module (TCM) data/communications. The supplied evidence also associates U0402 with the Electric Gear Shift Module context in manufacturer communication 9100437/9100437Rev1.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • A verified manufacturer communication states that customers may also comment on symptoms, but the supplied evidence excerpt does not identify those comments.
  • Not yet established by verified evidence.

6. Possible causes

  • The verified evidence does not establish a definitive cause from U0402 alone.
  • Manufacturer communication 9100641 identifies U0402 as relevant when diagnosing multiple loss-of-communication DTCs and directs checks of battery health, system voltage, and the TCM, including the valve body, when multiple loss-of-communication DTCs are present.
  • For the applicable 2024–2025 WS context, manufacturer communication 21-016-25 concerns valve-body replacement; this does not establish that every U0402 event requires valve-body replacement.

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

  • Record all stored diagnostic trouble codes before clearing them.
  • Arrange diagnosis by an authorized Jeep service facility or qualified technician.
  • Do not assume the shifter requires replacement based on U0402 alone; the verified manufacturer communication directs reference to TSB 21-016-25 before shifter replacement in the stated 2024–2025 WS context.

10. Step-by-step troubleshooting

  1. Check whether U0402 is accompanied by other loss-of-communication DTCs.
  2. When multiple loss-of-communication DTCs are present, verified manufacturer communication 9100641 directs checks of battery health, system voltage, and the TCM, including the valve body.
  3. Follow the applicable manufacturer diagnostic procedure. The supplied evidence does not provide further step-by-step testing instructions.

11. When to contact service

Service is recommended because U0402 concerns implausible TCM data and the supplied manufacturer communications provide diagnostic and bulletin guidance. The urgency and drivability impact are not established by the supplied evidence.

12. What the service center may check

  • Retrieve and document all DTCs, including whether U0101, U0140, U0155, U0129, U11C3, U0402, U0422, U0423, U0415, or U145D are also present, as listed in manufacturer communication 9100641.
  • If multiple loss-of-communication DTCs are present, check battery health and system voltage.
  • If multiple loss-of-communication DTCs are present, check the TCM, including the valve body.
  • Before any shifter replacement in the stated 2024–2025 WS context, refer to TSB 21-016-25 concerning valve-body replacement.

13. Possible repair or resolution

  • Not yet established by verified evidence.
  • The supplied communications do not support replacing a shifter solely because U0402 is stored.
  • For the stated 2024–2025 WS context, the verified communication directs review of TSB 21-016-25 before shifter replacement.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA Manufacturer Communication 21-016-25, published February 14, 2025: lists U0402, U0101, and U0418 and is referenced by later manufacturer communication for 2024–2025 WS valve-body replacement guidance before shifter replacement.
  • NHTSA Manufacturer Communication 9100641, published August 5, 2025: lists U0402 among relevant codes; when multiple loss-of-communication DTCs are present, it directs checks of battery health, system voltage, and the TCM including the valve body.
  • NHTSA Manufacturer Communication 9100437, published November 19, 2024, and 9100437Rev1, published October 24, 2025: identify U0402 as implausible data received from the TCM and direct reference to the valve-body bulletin before shifter replacement in the stated 2024–2025 WS context.

16. Recall information

  • Not yet established by verified evidence. The supplied sources are manufacturer communications/technical service bulletins, not recall records.

17. Official manufacturer information

Verified NHTSA-hosted manufacturer communications: 21-016-25 (NHTSA ID 11014380 and 11014387), 9100641 (NHTSA ID 11021842), 9100437Rev1 (NHTSA ID 11024582), and 9100437 (NHTSA ID 11010695).

19. Frequently asked questions

What does Jeep code U0402 mean?

The supplied verified evidence defines U0402 as “Implausible Data Received From TCM.”

Does U0402 prove that the shifter is defective?

No. The supplied evidence does not establish the shifter as the cause. In the stated 2024–2025 WS context, the manufacturer communication says to refer to TSB 21-016-25 on valve-body replacement before any shifter replacement.

What should be checked when U0402 occurs with multiple loss-of-communication codes?

Manufacturer communication 9100641 directs checks of battery health, system voltage, and the TCM, including the valve body.

Is it safe to drive or charge with U0402?

Not yet established by verified evidence.

20. Sources & verification

ReferenceVerified
Jeep U0402: Implausible data received from TCM **NOTE: Prior any… | EV Diagnostics