U357B
0 owner reports and 49 manufacturer filings across 18 model years from Cadillac, Chevrolet, GMC.
Where U357B shows up
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2026 Cadillac Escalade | Unknown Or Other | 6 | — |
| 2025 GMC Hummer EV | Unknown Or Other | 5 | — |
| 2024 GMC Hummer EV | Unknown Or Other | 5 | — |
| 2025 Cadillac Escalade | Unknown Or Other | 3 | — |
| 2026 Chevrolet Silverado | Unknown Or Other | 3 | — |
| 2025 Chevrolet Silverado | Unknown Or Other | 3 | — |
| 2023 GMC Hummer EV | Unknown Or Other | 3 | — |
| 2026 GMC Sierra | Unknown Or Other | 3 | — |
| 2025 GMC Sierra | Unknown Or Other | 3 | — |
| 2024 GMC Sierra | Unknown Or Other | 3 | — |
| 2024 Cadillac Lyriq | Fuel/Propulsion System | 2 | — |
| 2023 Cadillac Lyriq | Fuel/Propulsion System | 2 | — |
| 2024 Chevrolet Blazer | Fuel/Propulsion System | 2 | — |
| 2024 Chevrolet Equinox | Fuel/Propulsion System | 2 | — |
| 2025 Cadillac Lyriq | Unknown Or Other | 1 | — |
| 2025 Cadillac Optiq | Unknown Or Other | 1 | — |
| 2026 Cadillac Vistiq | Unknown Or Other | 1 | — |
| 2025 Chevrolet Blazer | Unknown Or Other | 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 U357B. Quoting the document number at a service desk is often the fastest route to a diagnosis someone has already written down.
- PIP6081C2026-07-14 · 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,
- PIP6081B2026-02-23 · 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,
- PIP60812025-08-22 · 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,
- PIP6021A2025-04-29 · 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
- PIP60212024-11-01 · 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 U357B means
Source: SAE J2012 / OBD-IIU357B 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 U357B
Source: NHTSA files and the OBD-II standardWhy does this page not define U357B?
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 U357B 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.