U0126: owner reports and bulletins

Network / communication. We haven't written the explanation for this code yet. Below is what owners and manufacturers have filed with NHTSA.

Got U0126 on your scanner? Tell the mechanic your year, make, model and any symptoms and you'll get the likely cause and what to check first. Ask about this code.

What owners report to NHTSA

5 complaints filed with NHTSA mention U0126, 5 of them since 2015, across 4 different models. The component owners most often filed it under: service brakes.

Manufacturer service bulletins that name U0126

72 technical service bulletins and manufacturer communications filed with NHTSA mention U0126, from 5 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • CHEVROLET SILVERADO 2500 (2020), bulletin 10178356: This Preliminary information communicates an issue with theElectronic Brake Control Module incorrectly mapping DTC U0126 as aU0131 and directs the dealership to follow the diagnostics for the U0126.
  • GMC SIERRA 2500 (2020), bulletin 10178356: This Preliminary information communicates an issue with theElectronic Brake Control Module incorrectly mapping DTC U0126 as aU0131 and directs the dealership to follow the diagnostics for the U0126.
  • LAND ROVER RANGE ROVER (2014), bulletin 10203420: Model: 15MY 3.0L and 5.0L Petrol Supercharger Derivatives only - ABS kdiagnostic Trouble Code U0126-87 Lost communication with Steering Angle fSensor' with no cause evident without any related cusstomer symptoms
  • CADILLAC ESCALADE (2015, 2016, 2017, 2018), bulletin 10164757: This Preliminary Information communication provides information to the technician about vehicles that may have any of these concerns remote keyless entry, passive Entry and Start Inoperative, No Fob detect message on dri…
  • CHEVROLET SILVERADO 1500 (2014, 2015, 2016, 2017), bulletin 10164757: This Preliminary Information communication provides information to the technician about vehicles that may have any of these concerns remote keyless entry, passive Entry and Start Inoperative, No Fob detect message on dri…
  • GMC SIERRA 1500 (2014, 2019, 2015, 2016), bulletin 10164757: This Preliminary Information communication provides information to the technician about vehicles that may have any of these concerns remote keyless entry, passive Entry and Start Inoperative, No Fob detect message on dri…

Sources: NHTSA Office of Defects Investigation complaint database and manufacturer communications file, snapshots September 2026. A complaint or bulletin that mentions a code is a report about that vehicle, not a statement that the code has one cause.