TSB Document:

• Sorry, the NHTSA has not posted this TSB document yet.

You can still get the detailed info from Hummer for this TSB. Call your local Hummer dealer's service department & ask for a copy of TSB# 09-04-21-005D.

Affected Component: POWER TRAIN:DRIVELINE

Summary

GM: THE SERVICE 4WD LIGHT IS ON AND A TROUBLE CODE IS SET. THIS IS A SOFTWARE PROBLEM. *RM

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