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# 3221C.

Affected Component: ENGINE AND ENGINE COOLING

Summary

SERVICE ENGINE SOON LIGHT DUE TO A P0171 DIAGNOSTIC TROUBLE CODE. *EH 3221A NOT YET RECEIVED. *TT UPDATE. *TT

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