U0129: 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 U0129 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

8 complaints filed with NHTSA mention U0129, 7 of them since 2015, across 8 different models. The component owners most often filed it under: service brakes.

Manufacturer service bulletins that name U0129

13 technical service bulletins and manufacturer communications filed with NHTSA mention U0129, from 4 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • DODGE CHALLENGER (2021), bulletin 10222994: Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further inves…
  • DODGE CHARGER (2021), bulletin 10222992: Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further inves…
  • CHRYSLER 300 (2021), bulletin 10222991: Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further inves…
  • CHEVROLET SILVERADO 1500 (2019, 2020), bulletin 10176304: This Preliminary information communicates an issue with the engine wiring harness shorting at the left front cylinder head causing any of the following issues: -IPC gauges sweeping while driving -Several IPC warning mess…
  • GMC SIERRA 1500 (2019, 2020), bulletin 10176304: This Preliminary information communicates an issue with the engine wiring harness shorting at the left front cylinder head causing any of the following issues: -IPC gauges sweeping while driving -Several IPC warning mess…

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.