U3578
1 owner report and 50 manufacturer filings across 19 model years from Cadillac, Chevrolet, GMC.
Where U3578 shows up
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports | Parts |
|---|---|---|---|---|
| 2026 Cadillac Escalade | Not specified | 6 | — | |
| 2025 GMC Hummer EV | Not specified | 5 | — | |
| 2024 GMC Hummer EV | Not specified | 5 | — | |
| 2025 Chevrolet Silverado | Not specified | 3 | 1 | |
| 2025 Cadillac Escalade | Not specified | 3 | — | |
| 2026 Chevrolet Silverado | Not specified | 3 | — | |
| 2023 GMC Hummer EV | Not specified | 3 | — | |
| 2026 GMC Sierra | Not specified | 3 | — | |
| 2025 GMC Sierra | Not specified | 3 | — | |
| 2024 GMC Sierra | Not specified | 3 | — | |
| 2024 Cadillac Lyriq | Fuel/Propulsion System | 2 | — | Fuel pump → |
| 2023 Cadillac Lyriq | Fuel/Propulsion System | 2 | — | Fuel pump → |
| 2024 Chevrolet Blazer | Fuel/Propulsion System | 2 | — | Fuel pump → |
| 2024 Chevrolet Equinox | Fuel/Propulsion System | 2 | — | Fuel pump → |
| 2025 Cadillac Lyriq | Not specified | 1 | — | |
| 2025 Cadillac Optiq | Not specified | 1 | — | |
| 2026 Cadillac Vistiq | Not specified | 1 | — | |
| 2025 Chevrolet Blazer | Not specified | 1 | — | |
| 2025 Chevrolet Equinox | Not specified | 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.
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U3578 by make
The same record, one make at a time: the model years, bulletins and owner reports that name U3578 on that maker’s vehicles.
What it gets filed under
50 manufacturer filings name U3578. 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 U3578.
- PIP6081C Service bulletin2026-07-14 · Unknown Or Other
- This Pi is to let dealer know that a program issue has been released and to not replace any hard for codes P2C8A, P2C8B, U3577, U3578, U3579, U357A, U357B, U357C, U357D, U357E, U357F, U3580, U3581, U3582, U3583, U3584, U2BAA, U2BAB, U2BAC, U2BAD, U2BAE,
- PIP6081B Service bulletin2026-02-23 · Unknown Or Other
- This Pi is to let dealer know that a program issue has been released and to not replace any hard for codes P2C8A, P2C8B, U3577, U3578, U3579, U357A, U357B, U357C, U357D, U357E, U357F, U3580, U3581, U3582, U3583, U3584, U2BAA, U2BAB, U2BAC, U2BAD, U2BAE,
- PIP6081 Service bulletin2025-08-22 · Unknown Or Other
- This Pi is to let dealer know that a program issue has been released and to not replace any hard for codes P2C8A, P2C8B, U3577, U3578, U3579, U357A, U357B, U357C, U357D, U357E, U357F, U3580, U3581, U3582, U3583, U3584, U2BAA, U2BAB, U2BAC, U2BAD, U2BAE,
- PIP6021A Service bulletin2025-04-29 · Unknown Or Other
- This Preliminary Information communicates that, under certain conditions, a MIL (Malfunction Indicator Lamp) illumination or a "Service High Voltage" message may display on the IPC (Instrument Panel Cluster), and the 12V battery may experience discharge. In these instances, it is advised to perform BECM (Battery Energy Control Module) programming and execute the Manual Reset Shunt process. This ap
- PIP6021 Service bulletin2024-11-01 · Fuel/Propulsion System
- This Preliminary Information communicates that, under certain conditions, a MIL (Malfunction Indicator Lamp) illumination or a "Service High Voltage" message may display on the IPC (Instrument Panel Cluster), and the 12V battery may experience discharge. In these instances, it is advised to perform BECM (Battery Energy Control Module) programming and execute the Manual Reset Shunt process. This ap
What U3578 means
Source: SAE J2012 / OBD-IIU3578 is a manufacturer-specific code: the second character is a 3, which under the OBD-II standard hands the definition to whoever built the vehicle. The same code can mean one thing on a Ford and something unrelated on a Hyundai. Any site that prints a single definition for it is guessing.
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 U3578
Source: NHTSA files and the OBD-II standardWhy does this page not define U3578?
Because it cannot be defined honestly. The second character of a trouble code says who owns its meaning, and a 1 or a 3 hands that to the manufacturer. Sites that print one definition for a manufacturer-specific code are showing you one automaker's meaning and hoping it is yours.
Can I keep driving with U3578 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.