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Diagnostic trouble code

P3055

2 owner reports and 108 manufacturer filings across 46 model years from Buick, Cadillac, Chevrolet, GMC.

PowertrainManufacturer-specific108 manufacturer filings2 owner reports

Where P3055 shows up

Source: NHTSA manufacturer communications and complaints
Model yearFiled underBulletinsOwner reports
2020 Chevrolet SilveradoElectrical System5—
2020 GMC SierraElectrical System5—
2021 Chevrolet SilveradoPower Train4—
2021 GMC SierraElectrical System4—
2018 Buick LaCrosseEquipment3—
2017 Buick LaCrosseEquipment3—
2020 Buick RegalEngine3—
2018 Buick RegalEngine3—
2021 Chevrolet BlazerElectrical System3—
2020 Chevrolet BlazerExterior Lighting3—
2020 Chevrolet EquinoxExterior Lighting21
2020 Chevrolet TraverseEngine21
2021 Buick EnclaveElectrical System2—
2020 Buick EnclaveEngine And Engine Cooling2—
2019 Buick EnclaveElectrical System2—
2018 Buick EnclaveElectrical System2—
2017 Buick EnclaveEngine And Engine Cooling2—
2019 Buick LaCrosseElectrical System2—
2019 Buick RegalEngine And Engine Cooling2—
2019 Cadillac CT6Engine And Engine Cooling2—
2018 Cadillac CT6Electrical System2—
2021 Cadillac XT4Engine And Engine Cooling2—
2020 Cadillac XT4Engine And Engine Cooling2—
2019 Cadillac XT4Electrical System2—
2021 Cadillac XT5Engine And Engine Cooling2—
2020 Cadillac XT5Engine And Engine Cooling2—
2019 Cadillac XT5Electrical System2—
2018 Cadillac XT5Engine And Engine Cooling2—
2021 Cadillac XT6Engine And Engine Cooling2—
2020 Cadillac XT6Engine And Engine Cooling2—
2019 Chevrolet BlazerEngine And Engine Cooling2—
2019 Chevrolet CruzeElectrical System2—
2018 Chevrolet CruzeEngine And Engine Cooling2—
2017 Chevrolet CruzeEngine And Engine Cooling2—
2021 Chevrolet EquinoxElectrical System2—
2021 Chevrolet MalibuElectrical System2—
2020 Chevrolet MalibuElectrical System2—
2019 Chevrolet MalibuEngine And Engine Cooling2—
2018 Chevrolet MalibuElectrical System2—
2021 Chevrolet TraverseElectrical System2—
2019 Chevrolet TraverseElectrical System2—
2018 Chevrolet TraverseElectrical System2—
2021 GMC AcadiaEngine And Engine Cooling2—
2020 GMC AcadiaEngine And Engine Cooling2—
2019 GMC AcadiaEngine And Engine Cooling2—
2018 GMC AcadiaElectrical System2—

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

Engine 43Electrical System 27Engine And Engine Cooling 25Exterior Lighting 4Power Train 4Equipment 2
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What owners said

Source: NHTSA complaint database

Owners’ own words, one per nameplate, scrubbed of anything identifying. These are unverified reports filed with NHTSA — they are what was said, not a finding that it was true.

on morning start-up there's an absurd amount of exhaust coming into the cabin area, the codes [P3055 and P3056] are registered from the computer of vehicle
2020 Chevrolet TraverseJan 13, 2025NHTSA owner report

Manufacturer filings that name it

Source: NHTSA manufacturer communications

Service bulletins and campaigns whose filed summary names P3055. Quoting the document number at a service desk is often the fastest route to a diagnosis someone has already written down.

What P3055 means

Source: SAE J2012 / OBD-II

P3055 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 P3055

Source: NHTSA files and the OBD-II standard

Why does this page not define P3055?

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 P3055 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.