U1345
0 owner reports and 15 manufacturer filings across 6 model years from Buick, Chevrolet.
Where U1345 shows up
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports | Parts |
|---|---|---|---|---|
| 2022 Chevrolet Bolt EUV | Power Train | 3 | — | |
| 2022 Chevrolet Bolt EV | Engine | 3 | — | |
| 2018 Chevrolet Traverse | Electrical System | 3 | — | Battery → |
| 2019 Buick Enclave | Engine | 2 | — | |
| 2019 Chevrolet Traverse | Engine | 2 | — | |
| 2017 Chevrolet Traverse | Electrical System | 2 | — | Battery → |
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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U1345 by make
The same record, one make at a time: the model years, bulletins and owner reports that name U1345 on that maker’s vehicles.
What it gets filed under
15 manufacturer filings name U1345. 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 U1345.
- 22-NA-139 Service bulletin2022-07-26 · Power Train
- This service bulletin provides repair information to correct a customer concern of a Malfunction Indicator Lamp (MIL) Illuminated and/or Driver Information Center (DIC) Displays Service Transmission Now, Unable to Shift Soon or Service Transmission, Unable to Shift Message with DTC U1345 or U135A Set.
- 22-NA-139 Service bulletin2022-07-01 · Power Train
- This service bulletin provides repair information to correct a customer concern of a Malfunction Indicator Lamp (MIL) Illuminated and/or Driver Information Center (DIC) Displays Service Transmission Now, Unable to Shift Soon or Service Transmission, Unable to Shift Message with DTC U1345 or U135A Set.
- PIC6463 Service bulletin2022-06-30 · Electrical System
- This Preliminary information communicates to the dealer if a vehicle comes in for an MIL or a message with DTC U1345 Engine Control Module LIN Bus 1 (or Bus 21) and/or DTC U135A that engineering is working on the issue and to clear the codes and return to the customer, Mil and message still may be one but at that time will drive normally for the next 100 ignition cycles.
- 19NA215 Service bulletin2019-09-17 · Structure
- This technical bulletin provides repair information to correct a customer concern of Service Engine Soon (SES) Lamp Illuminated, and technician finding DTC U1345 set.
- PIT5609A Service bulletin2019-06-13 · Engine And Engine Cooling
- This Preliminary information communicates SES lamp with DTC U1345. Inspect connection at the upper and lower Aero Shutters for water. Clean and repair as needed.
- PIT5609 Service bulletin2018-03-27 · Electrical System
- This Preliminary information communicatesSES lamp with DTC U1345. Inspect connection at the upper and lower Aero Shutters for water. Clean and repair as needed.
What U1345 means
Source: SAE J2012 / OBD-IIU1345 is a manufacturer-specific code: the second character is a 1, 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 U1345
Source: NHTSA files and the OBD-II standardWhy does this page not define U1345?
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 U1345 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.