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Service bulletin 08-07-30-023

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 id10025670
Published by NHTSA2008-08-28
Manufacturer's number08-07-30-023
Manufacturer's date2008-05-01
NHTSA componentPOWER TRAIN:AUTOMATIC TRANSMISSION

NHTSA's summary

4L60-E/4L65-E/4L70-E AUTOMATIC TRANSMISSION FLUID LEAK FROM OIL PUMP OR BELL HOUSING AREA (REPLACE TORQUE CONVERTER HUB-TO-OIL PUMP SEAL ASSEMBLY). ATTN: THIS BULLETIN APPLIES TO VEHICLES BUILT PRIOR TO DECEMBER 2007. *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

Transmission and driveline, Automatic transmission

Vehicles listed
CHEVROLET AVALANCHE2007, 2008
CHEVROLET EXPRESS2007, 2008
CHEVROLET SILVERADO2007, 2008
CHEVROLET SUBURBAN2007, 2008
CHEVROLET TAHOE2007, 2008
CHEVROLET TRAILBLAZER2008
CHEVROLET TRAILBLAZER 3602007 (the catalog's model; the bulletin names a series or trim of it)
GMC ENVOY2008
GMC ENVOY 3602007 (the catalog's model; the bulletin names a series or trim of it)
GMC SAVANA2007, 2008
GMC SIERRA2007, 2008
GMC YUKON2007, 2008
GMC YUKON XL2007, 2008
HUMMER H22007, 2008
SAAB 9-7X2007, 2008

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

Recalls for the same vehicles and component
08V3130002008-07-11. POWER TRAIN:AUTOMATIC TRANSMISSION

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
16-NA-1302023-03-08. Service bulletin. This service bulletin provides information for after installation of a replacement upper valve body, the transmission may have no Reverse and no 2nd gear.
06-00-89-031D2021-09-07. Service bulletin. OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification
06-00-89-031D2021-04-20. Service bulletin. OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification
150089004C2021-03-08. Service bulletin. This service bulletin provides technicians with updated information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
1308116001F2020-12-07. Service bulletin. The intent of this technical bulletin is to identify aftermarket ALDL or DLC interface devices as potential sources for causing multiple customer concerns that do not have other diagnostic methods to identify them.
PIT4585F2019-04-08. Service bulletin. This Preliminary Information communication provides information to the technician that the Serial Data Gateway Module (SDGM) may report "Crash Sense Failed" and the 300v Hybrid Battery Contactors will remain open until the Hybrid Powertrain Control Module's (HPCM) High Voltage (HV) DTCs are reset. And How to Reset.
PIP4681E2018-08-20. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that have a random bump, chuggle, or fishbite sensation when crowding the throttle slightly with the Torque Converter Clutch on while cruising at 35-60 miles per hour. Technician should follow all published Service Information diagnostics if the concern is repaired compare to a like vehicle with the same options.
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.
09-07-30-018D2018-06-04. Service bulletin. This informational bulletin provides a revision for 09-07-30-018C to add the 2014 model year and update the Labor Operation.
01-00-89-010J2018-05-21. Service bulletin. This informational bulletin provides a revision for 01-00-89-010I to add the 2013 model year.