U0402
8 owner reports and 97 manufacturer filings across 27 model years from Chrysler, Fiat, Jeep, Ram.
Where U0402 shows up
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports | Parts |
|---|---|---|---|---|
| 2025 Jeep Grand Cherokee | Power Train | 10 | — | |
| 2024 Jeep Grand Cherokee | Power Train | 10 | — | |
| 2016 Jeep Cherokee | Electrical System | 9 | — | Battery → |
| 2016 Chrysler 200 | Power Train | 8 | — | |
| 2023 Jeep Grand Cherokee | Power Train | 7 | — | |
| 2025 Jeep Grand Wagoneer | Power Train | 6 | — | |
| 2024 Jeep Grand Wagoneer | Power Train | 6 | — | |
| 2025 Jeep Wagoneer | Power Train | 6 | — | |
| 2024 Jeep Wagoneer | Power Train | 6 | — | |
| 2017 Jeep Renegade | Electrical System | 5 | — | Battery → |
| 2025 Ram 1500 | Power Train | 3 | 1 | |
| 2026 Jeep Grand Cherokee | Power Train | 3 | — | |
| 2023 Jeep Grand Wagoneer | Power Train | 3 | — | |
| 2023 Jeep Wagoneer | Power Train | 3 | — | |
| 2022 Ram 1500 | Engine | 3 | — | |
| 2016 Fiat 500 | Fuel/Propulsion System | 2 | — | Fuel pump → |
| 2017 Jeep Cherokee | Power Train | 1 | 1 | |
| 2022 Jeep Wrangler | Electrical System | — | 2 | Battery → |
| 2017 Ram Promaster City | Power Train | 2 | — | |
| 2017 Chrysler 200 | Power Train | 1 | — | |
| 2018 Chrysler 300 | Service Brakes | — | 1 | Brake pads → |
| 2022 Chrysler Pacifica | Power Train | — | 1 | |
| 2017 Fiat 500 X | Power Train | 1 | — | |
| 2016 Fiat 500 X | Engine | 1 | — | |
| 2021 Jeep Compass | Engine | — | 1 |
Showing the 25 model years where U0402 appears most; it is on file for 27 in total.
A model year appears here because the code is named in its record, not because every one of these vehicles sets it. Counts are mentions in the federal files, not failure rates — nobody publishes the denominator.
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U0402 by make
The same record, one make at a time: the model years, bulletins and owner reports that name U0402 on that maker’s vehicles.
What it gets filed under
What owners said
Source: NHTSA complaint databaseOwners’ own words, one per nameplate, scrubbed of anything identifying. These are unverified reports filed with NHTSA — they are what was said, not a finding that it was true.
The battery and alternator were tested and found to be functioning properly, and diagnostic trouble code U0402 was identified
It is the fifth repair attempt since I bought the vehicle on April 1, 2026: April 8 (valve body replaced), June 22 (TCM voltage codes P1DB9, P1614, U0402), August 25 (stability control warning), and October 6 (control module going offline…
Diagnostic codes recorded include U0402 (invalid data from transmission control module) and U1003 (CAN communication fault)
“Digit-verified cel stored codes p0973 in Tim and in pcm, abs bcm u0418 u0402, u422, alll are stored erased codes, no updates, removed air box to access ground and Tim connector, inspected harness from Tcm to transmission, removed and…
OBD code was U0402 (implausible data received from TCM) and (P1DD2 torque request signal from TCM denied)
97 manufacturer filings name U0402. Start with what the maker wrote down.
A code names the test that failed, not the part. A bulletin that names it is often a diagnosis someone has already written down — quote its number at the service desk.
Manufacturer filings that name it
Source: NHTSA manufacturer communicationsService bulletins and campaigns whose filed summary names U0402.
- 21-016-25 REV. C Service bulletin2025-08-15 · Power Train
- Valve Body Replacement 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): ● U0101 - Lost Communication With The Transmission Control Module (TCM). ● U0402 - Implausible Data Received From TCM. ● U0418 - Implausible Data Received From Brake System Control Module 1. Customers may als
- 21-016-25 REV. B Service bulletin2025-08-07 · Power Train
- Valve Body Replacement 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): ● U0101 - Lost Communication With The Transmission Control Module (TCM). ● U0402 - Implausible Data Received From TCM. ● U0418 - Implausible Data Received From Brake System Control Module 1. Customers may als
- 9100641 Service bulletin2025-08-05 · Power Train
- Symptoms/Condition: Shifter reports loss communication AND NO OTHER MODULES report the condition. Diagnostic: Please make sure ONLY shifter reports loss communication. If there are other modules reporting loss communication, then follow the existing service procedure Repair Procedure: 1. Verify Complaint - ESM reports a Loss of Communication (LOC) DTC, but no other modules do. - If multiple module
- 21-016-25 REV. A Service bulletin2025-05-18 · Power Train
- "Valve Body Replacement 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): ● U0101 - Lost Communication With The Transmission Control Module (TCM). ● U0402 - Implausible Data Received From TCM. ● U0418 - Implausible Data Received From Brake System Control Module 1. Customers may al
- 21-016-25 Service bulletin2025-02-14 · Power Train
- "Valve Body Replacement 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): ● U0101 - Lost Communication With The Transmission Control Module (TCM). ● U0402 - Implausible Data Received From TCM. ● U0418 - Implausible Data Received From Brake System Control Module 1. Customers may a
- 21-016-25 Service bulletin2025-02-14 · Power Train
- "Valve Body Replacement 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): ● U0101 - Lost Communication With The Transmission Control Module (TCM). ● U0402 - Implausible Data Received From TCM. ● U0418 - Implausible Data Received From Brake System Control Module 1. Customers may a
What U0402 means
Source: SAE J2012 / OBD-IIU0402 sits in the generic range of the OBD-II standard, so it means the same thing on every vehicle sold in the United States — but WhichTrim does not carry a definition for it and will not invent one. What is on this page is the record: who named it and on what.
A stored code names the test that failed, never the part that caused it. It is the starting point of a diagnosis, not its conclusion — the same code has several possible causes and the cheap one is not always right.
Common questions about U0402
Source: NHTSA files and the OBD-II standardCan I keep driving with U0402 stored?
Nobody can answer that from the code alone, and a site that does is guessing. A steady light means a fault was logged and the car should be checked soon; a flashing light means a severe misfire — slow down and get it seen as soon as possible, because severe misfire can quickly damage the catalytic converter. The safe read of this page is the mileage and the components, not permission.
Does a code mean the car is recalled?
No. Recalls are filed by campaign and matched by VIN, and none of them are triggered by a scan tool. If you want to know whether an open recall applies to one specific vehicle, check the VIN at nhtsa.gov/recalls — that is the only source that settles it.
Why do the counts here differ from other sites?
Because these are not estimates. Every number on this page is a count of documents in NHTSA's own files: manufacturer communications that name the code in their filed summary, and owner complaints that name it in the narrative. We do not model, weight or extrapolate them.
Will clearing the code fix it?
Clearing turns the light off and erases the freeze-frame data a technician would have used to work out what happened. If the condition is still there the code returns, usually within a few drive cycles, and the diagnosis now starts from less information than before.