C0550: owner reports and bulletins

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

Got C0550 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

6 complaints filed with NHTSA mention C0550, 5 of them since 2015, across 4 different models. The component owners most often filed it under: steering.

Manufacturer service bulletins that name C0550

1 technical service bulletins and manufacturer communications filed with NHTSA mention C0550, from 1 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • BUICK ENVISION (2016, 2017), bulletin 10111712: This Preliminary Information communication provides information to the technician about vehicles that have a Service AWD message and/or flashing Rear Drive Warning Instrument Panel Cluster indicator. Technician may find …

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.