C056D: 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 C056D 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

11 complaints filed with NHTSA mention C056D, 11 of them since 2015, across 9 different models. The component owners most often filed it under: steering.

Manufacturer service bulletins that name C056D

81 technical service bulletins and manufacturer communications filed with NHTSA mention C056D, from 4 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • BUICK ENCLAVE (2018, 2019, 2020, 2021), bulletin 10201321: This Preliminary information communicates informationto diagnose DTC C056D or C056E.
  • CADILLAC XT5 (2017, 2018, 2019, 2020), bulletin 10201321: This Preliminary information communicates informationto diagnose DTC C056D or C056E.
  • CHEVROLET BLAZER (2019, 2020, 2021, 2022), bulletin 10201321: This Preliminary information communicates informationto diagnose DTC C056D or C056E.
  • GMC ACADIA (2017, 2018, 2019, 2020), bulletin 10201321: This Preliminary information communicates informationto diagnose DTC C056D or C056E.
  • GMC TERRAIN NA (2022, 2018, 2019, 2020), bulletin 10213253: This service bulletin provides repair information to correct a customer concern of a Service AWD Message in DIC at Ignition On with DTC C056D Set.
  • CHEVROLET TRAVERSE (2018, 2019, 2020, 2021), bulletin 10213253: This service bulletin provides repair information to correct a customer concern of a Service AWD Message in DIC at Ignition On with DTC C056D Set.

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.