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Service bulletin 08-07-30-021

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 id10025402
Published by NHTSA2008-08-07
Manufacturer's number08-07-30-021
Manufacturer's date2008-04-01
NHTSA componentLATCHES/LOCKS/LINKAGES:DOORS:LATCH; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; ENGINE AND ENGINE COOLING:ENGINE

NHTSA's summary

LOSS OF HIGH SPEED GMLAN COMMUNICATIONS, INTERMITTENT NO CRANK, IPC GAUGE FLUCTUATION, INTERMITTENT DOOR LOCK CYCLING, TRANSMISSION MAY NOT SHIFT, DTCS U0073, U0100, U0101, U0102, 70140 (REPAIR BACKED OUT TERMINAL IN TRANSMISSION HARNESS CONNECTOR). *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

Electrical system, Engine, Latches and locks, Transmission and driveline, Automatic transmission, Door latch, Instrument cluster, Transmission control module

Trouble codes named

U0073, U0100, U0101, U0102

Vehicles listed
CADILLAC ESCALADE2007, 2008
CADILLAC ESCALADE ESV2007, 2008 (the catalog's model; the bulletin names a series or trim of it)
CADILLAC ESCALADE EXT2007, 2008 (the catalog's model; the bulletin names a series or trim of it)
CADILLAC XLR2007, 2008
CHEVROLET CORVETTE2007, 2008
CHEVROLET CORVETTE Z062007, 2008 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SILVERADO2007, 2008
CHEVROLET SUBURBAN 15002007, 2008 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET TAHOE2007, 2008
GMC SIERRA2007, 2008
GMC YUKON2007, 2008

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
PIT52082023-12-26. Service bulletin. Fuel Gauge Shows Empty After Refueling And DTC P2636.
PIT5195B2023-12-26. Service bulletin. Speedometer Needle Accuracy Information.
PIT51952023-12-26. Service bulletin. Speedometer Needle Accuracy Information
PIT52082023-12-11. Service bulletin. Fuel Gauge Shows Empty After Refueling And DTC P2636.
PIT5195B2023-12-11. Service bulletin. Speedometer Needle Accuracy Information.
PIT51952023-12-11. Service bulletin. Speedometer Needle Accuracy Information
07-08-49-020R2023-10-18. Service bulletin. This informational bulletin provides information for the IPC odometer programming method quick reference guide.
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.
PIT5195G2022-06-13. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that the speedometer needle appears to be inaccurate. Dealer should advise the customer the specification for speedometer needle accuracy is +/- 2 MPH at any given speed when looking straight at the needle.
06-00-89-031D2021-09-07. Service bulletin. OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification