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Diagnostic trouble code

P11A9

1 owner report and 365 manufacturer filings across 22 model years from Nissan, Volkswagen.

PowertrainManufacturer-specific365 manufacturer filings1 owner report

Where P11A9 shows up

Source: NHTSA manufacturer communications and complaints
Model yearFiled underBulletinsOwner reports
2019 Volkswagen Golf / GTIEquipment56—
2021 Volkswagen AtlasEquipment38—
2020 Volkswagen AtlasEquipment29—
2020 Volkswagen Golf / GTIEquipment29—
2021 Volkswagen Golf / GTIEquipment22—
2019 Volkswagen AtlasEquipment19—
2020 Volkswagen JettaEquipment19—
2019 Volkswagen JettaEquipment19—
2020 Volkswagen PassatEngine And Engine Cooling19—
2019 Volkswagen PassatEquipment19—
2019 Volkswagen TiguanEquipment19—
2020 Volkswagen TiguanEngine And Engine Cooling18—
2021 Volkswagen JettaEquipment13—
2018 Volkswagen JettaEquipment9—
2018 Volkswagen PassatEquipment7—
2017 Volkswagen PassatEquipment7—
2016 Volkswagen PassatEquipment7—
2018 Volkswagen AtlasEquipment6—
2018 Volkswagen Golf / GTIElectrical System4—
2017 Volkswagen Golf / GTIEquipment4—
2017 Volkswagen JettaEngine And Engine Cooling2—
2025 Nissan RogueEngine—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

Equipment 184Engine And Engine Cooling 78Engine 12Electrical System 11Structure 6Power Train 6
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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.

The vehicle was recalled and when they reprogrammed the ECM, a code P11a9 appeared which led to the VCR actuator
2025 Nissan RogueAug 28, 2026NHTSA owner report

Manufacturer filings that name it

Source: NHTSA manufacturer communications

Service bulletins and campaigns whose filed summary names P11A9. Quoting the document number at a service desk is often the fastest route to a diagnosis someone has already written down.

What P11A9 means

Source: SAE J2012 / OBD-II

P11A9 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 P11A9

Source: NHTSA files and the OBD-II standard

Why does this page not define P11A9?

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 P11A9 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.