⌘K
Find a vehicle
RecallsCompareNewsPricing
Your vehicle
VIN decoderWindow stickerProblems by systemTitle brands
Federal filings
Service bulletinsOwner complaintsInvestigationsEarly Warning reportsWarranty extensionsDriver-assist crashesTrouble codes
Browse the record
GuidesRankingsAll makesQuarterly reportsWhat is in the data
Paperwork
Repair Claim KitCar CheckFor attorneysFor expert witnessesFor repair shopsRecall disclosure formRecall fix sheets
Tools and data
Recall WatchFleet VIN checkCost calculatorsCar crosswordAPI & data
Sign inGarage
Federal filingsHome›Trouble codes› U1518
Diagnostic trouble code

U1518

0 owner reports and 55 manufacturer filings across 21 model years from Buick, Cadillac, Chevrolet.

Network Manufacturer-specific 55 manufacturer filings

Where U1518 shows up

Source: NHTSA manufacturer communications and complaints
Model yearFiled underBulletinsOwner reportsParts
2021 Cadillac XT4Equipment4—
2020 Cadillac XT4Electrical System4—Battery →
2021 Cadillac XT5Electrical System4—Battery →
2020 Cadillac XT5Electrical System4—Battery →
2021 Cadillac XT6Equipment4—
2020 Cadillac XT6Electrical System4—Battery →
2022 Cadillac XT4Equipment3—
2019 Cadillac XT4Electrical System3—Battery →
2022 Cadillac XT5Not specified3—
2019 Cadillac XT5Electrical System3—Battery →
2022 Cadillac XT6Electrical System3—Battery →
2019 Buick LaCrosseElectrical System2—Battery →
2022 Chevrolet CamaroNot specified2—
2021 Chevrolet CamaroElectrical System2—Battery →
2020 Chevrolet CamaroElectrical System2—Battery →
2019 Chevrolet CamaroNot specified2—
2018 Chevrolet CamaroElectrical System2—Battery →
2023 Cadillac XT4Electrical System1—Battery →
2023 Cadillac XT5Electrical System1—Battery →
2023 Cadillac XT6Equipment1—
2023 Chevrolet CamaroElectrical System1—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.

Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.

U1518 by make

The same record, one make at a time: the model years, bulletins and owner reports that name U1518 on that maker’s vehicles.

Cadillac 14Chevrolet 6

What it gets filed under

Electrical System 30 Equipment 20 Not specified 5

55 manufacturer filings name U1518. 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.

Read the filingsSearch every bulletin →
Photo: Compagnons / Unsplash

Manufacturer filings that name it

Source: NHTSA manufacturer communications

Service bulletins and campaigns whose filed summary names U1518.

What U1518 means

Source: SAE J2012 / OBD-II

U1518 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.

From here
Get a model's new bulletins by email See what owners reported Look up a bulletin by its number Watch a VIN for new recalls

Common questions about U1518

Source: NHTSA files and the OBD-II standard

Why does this page not define U1518?

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 U1518 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.

Where to go next

pages beside this code
Filed alongside B3055 Another code that appears in the same filings and owner reports as U1518.Filed alongside B3060 Another code that appears in the same filings and owner reports as U1518.Vehicle 2021 Cadillac XT4 The model year U1518 is filed against most often.The data Trouble codes by API GET /v1/dtc joins every code to bulletins and owner reports — free tier, no card.