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Service bulletin 21-NA-177

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10217102
Published by NHTSA2022-08-04
Manufacturer's number21-NA-177
Manufacturer's date2022-07-25
NHTSA componentSTEERING

NHTSA's summary

This service bulletin provides repair information to correct a customer concern of Service Power Steering DIC Message, DTC C0051 58 - Steering Wheel Angle Sensor Error Set.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Steering

Trouble codes named

C0051

Vehicles listed
BUICK ENCORE GX2020, 2021, 2022
CHEVROLET TRAILBLAZER2021, 2022

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
PI0281L2025-06-12. Service bulletin. This preliminary informational (PI) bulletin provides information to dealership personnel that may be helpful when addressing underbody component corrosion with customers.
25-NA-0652025-04-24. Service bulletin. This informational bulletin instructs the tech when fuel/fluid is needed to be tested and where it can be sent for analysis.
16-NA-1092025-02-28. Service bulletin. This service bulletin provides a procedure inspecting for excess grease or Sealant on the Exterior of the steering gear due to seeing grease or sealant on certain locations on the gear.
24-NA-2392025-01-30. Service bulletin. This informational bulletin provides a guide on how to diagnose and test for vibrations utilizing the PicoScope.
04-06-01-029K2024-12-04. Service bulletin. This informational bulletin explains Unscheduled Supplemental Services and the importance of GM Simplified Maintenance Schedules.
03-00-91-001I2023-11-22. Service bulletin. This service bulletin provides a vibration analysis worksheet the technician can use in conjunction with the appropriate Vibration Analysis-Road testing procedure when diagnosing vibration concerns.
15-00-89-004F2023-09-08. Service bulletin. This service bulletin provides technicians with updated information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
N222371150-032023-06-05. Service bulletin. Customer Satisfaction Program. Message sent to dealers to announce the final VINs were released.
PI0281J2023-05-04. Service bulletin. This preliminary informational (PI) bulletin provides information to dealership personnel which may be helpful when addressing underbody component corrosion with customers.
N222371150-022023-03-22. Service bulletin. Customer Satisfaction Program. Due to the industry-wide semiconductor shortage, the heat feature on the steering wheel is not functional on certain 2022-2023 model year vehicles listed above, built beginning January 6, 2022. The affected vehicle owners should have been made aware of the condition at sale, and notified that once parts are available, they would be eligible for a no additional cost retrofit to enable the feature. Dealers are to replace the heated steering wheel control module.