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Diagnostic trouble code · Subaru

B28A6 on Subaru vehicles

B28A6 is named on 7 Subaru model years (2022–2024): 19 manufacturer filings and 0 owner reports in NHTSA’s files, across Ascent, Legacy, Outback, Forester.

Body 7 model years 19 manufacturer filings

Which Subaru model years name B28A6

Source: NHTSA manufacturer communications and complaints
Model yearFiled underBulletinsOwner reports
2024 Subaru AscentElectrical System3—
2024 Subaru LegacyForward Collision Avoidance3—
2024 Subaru OutbackForward Collision Avoidance3—
2023 Subaru AscentForward Collision Avoidance3—
2023 Subaru LegacyForward Collision Avoidance3—
2023 Subaru OutbackForward Collision Avoidance3—
2022 Subaru ForesterForward Collision Avoidance1—

A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.

Forward Collision Avoidance 12 Electrical System 3 Lane Departure 3 Equipment 1
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Subaru filings that name B28A6

Source: NHTSA manufacturer communications

Bulletins and campaigns Subaru filed with NHTSA whose summary names B28A6. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

What B28A6 means

Source: SAE J2012 / OBD-II

B28A6 sits in the generic range of the OBD-II standard, so it means the same thing on every vehicle sold in the United States — but WhichTrim does not carry a definition for it and will not invent one. What is on this page is the record: who named it and on what.

A stored code names the test that failed, never the part that caused it. The record above is what Subaru and its owners have filed about it; the code’s page across every make has the whole file.

From here

Common questions

Source: NHTSA files and the OBD-II standard

Is B28A6 a known problem on Subaru vehicles?

It is a documented one: NHTSA's files hold 19 manufacturer filings and 0 owner reports naming B28A6 on 7 Subaru model years (2022–2024). Whether it is a problem on one particular car is a diagnosis, not a count — but a bulletin that names the code on your model year is the place to start.

Which Subaru models does B28A6 appear on most?

2024 Ascent (3 documents), 2023 Ascent (3 documents), 2024 Legacy (3 documents).

Does B28A6 on a Subaru mean it is recalled?

No. Recalls are filed by campaign and matched by VIN; no recall is triggered by a scan tool. Check the VIN at nhtsa.gov/recalls, or open the model year's page here for the campaigns filed against it.