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Service bulletin PIP-4647A

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 id10032869
Published by NHTSA2010-06-04
Manufacturer's numberPIP-4647A
Manufacturer's date2009-06-01
NHTSA componentPOWER TRAIN:AUTOMATIC TRANSMISSION; STEERING:GEAR BOX (OTHER THAN RACK AND PINION)

NHTSA's summary

GMC/CHEVROLET/SAAB/HUMMER: BIND/TIE-UP IN FOURTH GEAR, NO SECOND OR FOURTH GEARS, OVERRUN CLUTCH DISTRESS. DURING DISASSEMBLY OF THE TRANSMISSION TECHNICIANS MAY FIND THAT THE 2-4 BAND (ITEM 602 IN SI DOCUMENT 1553208) AND THE OVERRUN CLUTCH (645) ARE BOTH DISTRESSED WHILE NO OTHER CLUTCHES ARE DAMAGED. *PE

The document

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

Components

Steering, Transmission and driveline, Automatic transmission, Steering gear

Vehicles listed
CHEVROLET COLORADO2009
CHEVROLET EXPRESS2009
CHEVROLET SILVERADO2009
CHEVROLET TAHOE2009
CHEVROLET TRAILBLAZER2009
GMC CANYON2009
GMC ENVOY2009
GMC SAVANA2009
GMC SIERRA2009
GMC YUKON2009
HUMMER H32009
SAAB 9-7X2009

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

Other bulletins for the same vehicles and component
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PIP3366C2018-08-20. Service bulletin. This Preliminary information communicates to the dealer technician thatLight Duty Trucks equipped with automatic transmissions and 4 wheel drive may exhibit a condition of grinding/ratcheting type noise when shifting the automatic transmission into park while the transfer case is in 4 wheel drive low (4LO) range. Dealers technician's are advised this condition should be deemed a normal characteristic of 4WD low operation.
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