U0115: 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 U0115 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

1 complaints filed with NHTSA mention U0115, 1 of them since 2015, across 1 different models. The component owners most often filed it under: unknown or other.

Manufacturer service bulletins that name U0115

2 technical service bulletins and manufacturer communications filed with NHTSA mention U0115, from 2 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • MERCEDES-MAYBACH S 580 (2021), bulletin 11005285: Complaint Check engine light illuminates. No driveability complaint. Fault codes U0115 and U0168 stored in ISA control unit Cause ISA control unit software Remedy Clear fault codes and perform a test drive. If fault does…
  • MERCEDES-BENZ S 580 (2021), bulletin 11005285: Complaint Check engine light illuminates. No driveability complaint. Fault codes U0115 and U0168 stored in ISA control unit Cause ISA control unit software Remedy Clear fault codes and perform a test drive. If fault does…

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.