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Service bulletin 101201

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 id621773
Published by NHTSA2001-10-01
Manufacturer's number101201
Manufacturer's date2001-03-01
NHTSA componentUNKNOWN OR OTHER

NHTSA's summary

INFORMATION REGARDING DIAGNOSTIC TROUBLE CODES (DTC'S) P1641 AND P1654 ON MODEL YEAR 2001 WITH VIN 192555 AND EARLIER. *TT

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Trouble codes named

P1641, P1654

Vehicles listed
AM GENERAL HUMMER2001

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