Service bulletin 20890

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.

NHTSA's summary

20890 ? Customer Advisory Letter. On these dual rear-wheel vehicles, the rear-wheel lug nuts and studs may be damaged during the removal and attachment process. Damaged lug nuts and studs could result in a loose or detached wheel. This condition may be noticeable during normal vehicle maintenance and torque checks. Customers are being advised to immediately inspect their vehicle's rear-wheel lug nuts and studs for damage and replace them if necessary. Customers are also being advised to continue this inspection as part of normal vehicle maintenance and that replacement lug nuts and/or studs are available from their local GM dealer.

The document

• NHTSA's copy of the document (PDF)
• If that address does not open, try this one

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

Wheels, Wheel nuts and studs

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

• Bulletins for another vehicle
• Report an error on this page
• Report an error by email