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Service bulletin 20NA156

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 id10214201
Published by NHTSA2022-06-21
Manufacturer's number20NA156
Manufacturer's date2022-01-27
NHTSA componentEQUIPMENT ADAPTIVE/MOBILITY; SUSPENSION:REAR:AXLE:SPINDLE; SUSPENSION:REAR:AXLE:NON-POWERED AXLE ASSEMBLY; SERVICE BRAKES

NHTSA's summary

This technical bulletin provides a procedure to replace the rear axle c-clips if found the cause of the customers concern.

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

Brakes, Equipment and accessories, Suspension

Vehicles listed
CHEVROLET COLORADO2015, 2016, 2017, 2018, 2019, 2020, 2021
GMC CANYON2015, 2016, 2017, 2018, 2019, 2020, 2021

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

Recalls for the same vehicles and component
21V4970002021-07-01. EQUIPMENT:OTHER:LABELS
20155752015-11-30. Accessories
15V2780002015-05-12. SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC:CALIPER
20151922015-05-11. Brakes

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

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.
17-NA-3942025-04-26. Service bulletin. This technical bulletin provides a procedure for lubricating the rear leaf springs and re-torque the bolts to correct a squeak, clunking noise.
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.
05-03-07-009L2025-03-08. Service bulletin. This service bulletin provides information on Wheel Alignment Specifications, Requirements and Recommendations for GM Vehicles.
17-NA-3942025-03-06. Service bulletin. This technical bulletin provides a procedure for lubricating the rear leaf springs and re-torque the bolts to correct a squeak, clunking noise.
21-NA-0432025-02-12. Service bulletin. This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
17-NA-3942025-01-18. Service bulletin. This technical bulletin provides a procedure for lubricating the rear leaf springs and re-torque the bolts to correct a squeak, clunking noise.
PIT5696H2024-12-12. Service bulletin. This preliminary information discusses potential for a code C0010.5A to store in the brake controller which appears to be setting falsely or is induced by the customer.
21-NA-0432024-12-10. Service bulletin. This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
05-03-08-002J2024-09-20. Service bulletin. This service bulletin provides information to dealership personnel on diagnosis and replacement of shock absorber and strut due to fluid leak.