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Diagnostic trouble code · Cadillac

B305A on Cadillac vehicles

B305A is named on 8 Cadillac model years (2016–2019): 20 manufacturer filings and 0 owner reports in NHTSA’s files, across ATS, CTS.

Body 8 model years 20 manufacturer filings

Which Cadillac model years name B305A

Source: NHTSA manufacturer communications and complaints
Model yearFiled underBulletinsOwner reports
2016 Cadillac ATSSteering4—
2016 Cadillac CTSSteering4—
2017 Cadillac ATSSteering3—
2017 Cadillac CTSSteering3—
2018 Cadillac ATSSteering2—
2018 Cadillac CTSSteering2—
2019 Cadillac ATSSteering1—
2019 Cadillac CTSSteering1—

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.

Steering 16 Electrical System 4
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Cadillac filings that name B305A

Source: NHTSA manufacturer communications

Bulletins and campaigns Cadillac filed with NHTSA whose summary names B305A. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

What B305A means

Source: SAE J2012 / OBD-II

B305A 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. The record above is what Cadillac 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 B305A a known problem on Cadillac vehicles?

It is a documented one: NHTSA's files hold 20 manufacturer filings and 0 owner reports naming B305A on 8 Cadillac model years (2016–2019). 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 Cadillac models does B305A appear on most?

2016 ATS (4 documents), 2016 CTS (4 documents), 2017 ATS (3 documents).

Does B305A on a Cadillac 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.