C056D on the 2018 Chevrolet Impala
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
Nobody has written a description of this code yet.
| 19NA182 | 2019-09-23. Service bulletin. This technical bulletin provides repair information to correct a customer concern of "Steering Assist Is Reduced" Message and One of The Following DTCs Are Set: C056D, U0415. |
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1 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.