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Home›Trouble codes›U0121› Chevrolet
Diagnostic trouble code · Chevrolet

U0121 on Chevrolet vehicles A module has stopped hearing from the anti-lock brake controller

U0121 is named on 15 Chevrolet model years (2016–2023): 50 manufacturer filings and 1 owner report in NHTSA’s files, across Suburban, Tahoe, Silverado, Silverado 2500HD, Trax and 3 more.

Network 15 model years 50 manufacturer filings 1 owner report

Which Chevrolet model years name U0121

Source: NHTSA manufacturer communications and complaints
Model yearFiled underBulletinsOwner reports
2016 Chevrolet SuburbanSteering7—
2016 Chevrolet TahoeSteering7—
2017 Chevrolet SuburbanSteering5—
2017 Chevrolet TahoeSteering5—
2016 Chevrolet SilveradoElectrical System4—
2016 Chevrolet Silverado 2500HDEquipment4—
2019 Chevrolet TraxElectrical System3—
2018 Chevrolet TraxElectrical System3—
2017 Chevrolet TraxElectrical System3—
2016 Chevrolet TraxElectrical System3—
2017 Chevrolet Bolt EVElectrical System2—
2016 Chevrolet EquinoxEquipment2—
2023 Chevrolet TraverseService Brakes—1
2020 Chevrolet TraxElectrical System1—
2018 Chevrolet Bolt EVElectrical System1—

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.

Electrical System 22 Steering 8 Equipment 7 Suspension 3
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Chevrolet filings that name U0121

Source: NHTSA manufacturer communications

Bulletins and campaigns Chevrolet filed with NHTSA whose summary names U0121. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

What U0121 means

Source: SAE J2012 / OBD-II

A module has stopped hearing from the anti-lock brake controller.

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

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

Source: NHTSA files and the OBD-II standard

Is U0121 a known problem on Chevrolet vehicles?

It is a documented one: NHTSA's files hold 50 manufacturer filings and 1 owner report naming U0121 on 15 Chevrolet model years (2016–2023). 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 Chevrolet models does U0121 appear on most?

2016 Suburban (7 documents), 2016 Tahoe (7 documents), 2017 Suburban (5 documents).

Does U0121 on a Chevrolet 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.

Where to go next

pages beside this code
Filed alongside P0300 Another code that appears in the same filings and owner reports as U0121.Filed alongside B3055 Another code that appears in the same filings and owner reports as U0121.Vehicle 2016 Chevrolet Suburban The model year U0121 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.