U0442
0 owner reports and 14 manufacturer filings across 10 model years from Mazda.
Where U0442 shows up
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2018 Mazda CX-5 | Engine | 4 | — |
| 2019 Mazda CX-5 | Engine And Engine Cooling | 2 | — |
| 2019 Mazda CX-3 | Engine | 1 | — |
| 2025 Mazda CX-5 | Engine | 1 | — |
| 2024 Mazda CX-5 | Engine | 1 | — |
| 2023 Mazda CX-5 | Engine | 1 | — |
| 2022 Mazda CX-5 | Engine | 1 | — |
| 2021 Mazda CX-5 | Engine | 1 | — |
| 2020 Mazda CX-5 | Engine | 1 | — |
| 2019 Mazda MX-5 | Engine | 1 | — |
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.
What it gets filed under
Manufacturer filings that name it
Source: NHTSA manufacturer communicationsService bulletins and campaigns whose filed summary names U0442. Quoting the document number at a service desk is often the fastest route to a diagnosis someone has already written down.
- SA-011-262026-02-26 · Engine
- Some vehicles may display some (or all) of the following symptoms: • Check engine light on with DTC P061B • Light increase in engine rpms during acceleration • Transmission will not shift past 4th gear • Various U codes (U0401 ABS, U0401, U0415 FSC, U0301, U0316 SBS/MRCC, U0442 TCM) may be set
- SA-011-19a2019-05-13 · Engine And Engine Cooling
- Some vehicles may display some (or all) of the following symptoms: Check engine light on wit DTC P061B Surging on acceleration Transmission will not shift past 4th gear Various U codes (U0401 ABS, U0401, U0415 FSC, U0301, U0316 SBS/MRCC, U0442 TCM) may be set
- SA-011-192019-02-28 · Power Train
- Some vehicles may display some (or all) of the following symptoms: Check engine light on wit DTC P061B, Surging on acceleration, Transmission will not shift past 4th gear, Various U codes (U0401 ABS, U0401, U0415 FSC, U0301, U0316 SBS/MRCC, U0442 TCM) may be set.
- 01-015-18-3513a2018-10-23 · Engine
- Some vehicles may experience a lack of power and the check engine light on with DTC P061B:00 and U0401:00 stored in the PCM memory when engine cranking is interrupted and on A/T vehicles, DTC U0442:00 is also stored. This concern most likely occurs when the brake pedal is released during engine cranking. DTC P061B:00 - [PCM] Internal control module torque calculation performance problem. DTC U0401
What U0442 means
Source: SAE J2012 / OBD-IIU0442 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 U0442
Source: NHTSA files and the OBD-II standardCan I keep driving with U0442 stored?
Nobody can answer that from the code alone, and a site that does is guessing. A steady light generally means the fault was logged and the vehicle is in a reduced-risk mode; a flashing light means stop soon, because a misfiring engine can destroy a catalytic converter in minutes. 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.