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Service Bulletin #:  02-07-30-024B Date: August 2005 Subject:  Diagnosis of Cracked or Broken Transmission Case Model(s): 2006 and Prior Cars and Light Duty Trucks2006 and Prior Hummer H22006 Hummer H32005-2006 Saab 9-7Xwith 4L60/4L60-E... Read More

Service Bulletin #:  02-07-30-001D Date: December 2005 Subject:  Diagnostic Information on Diagnostic Trouble Code (DTC) P0894 and P1870 Model(s): 2000-2006 GM Passenger Cars and Light Duty Trucks2003-2006 Hummer H22006 Hummer H32005-2006... Read More

Service Bulletin #:  01-07-30-036F Date: February 2006 Subject:  Diagnostic Tips for Automatic Transmission DTC P0756, Second, Third, Fourth Gear Start Model(s): 2007 and Prior Passenger Cars and Light Duty Trucks2003-2007 Hummer H22006... Read More

Bulletin No: 03.08.42.012Subject: Twilight Sentinel/Automatic Headlamp Control Not Functioning Correctly or is Inoperative (Reprogram BCM) 2000-2004 Chevrolet Corvette with Automatic Headlamp Control (RPO T82) ConditionSome customers may comment that... Read More

Attached below two one-page PDF documents consisting of an electrical diagram for the 2006 automatic AC system.General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those... Read More

Service Bulletin #:  06-00-89-031 Date: June 2006 Subject:  Engine and Automatic Transmission/Transaxle Identification Model(s): 2004 - 2007 GM Passenger Cars and Trucks (Including Saturn)2004-2007 Hummer H22006-2007 Hummer H32005-2007... Read More

Service Bulletin #:  05-07-30-023 Date: September 2005 Subject:  New Product Announcement -- Hydra-Matic 6L80 Automatic Transmission Model(s): 2006 Cadillac STS-V, XLR-V2006 Chevrolet Corvettewith 6L80 Automatic Transmission (RPO MYC)... Read More

Service Bulletin #:  03-07-30-043a Date: May 2005 Subject:  Information Regarding Automatic Transmission Shift Lock Control Function Model(s): 2007 and Prior Passenger Cars and Trucks (Including Saturn)2007 and Prior HUMMER H2, H32005 ... Read More

2008 Hydra-Matic 6L80 (MYC) 2008 Model Year SummaryHydra-Matic 6L80 six-speed automatic Car & Truck transmission New application: Hummer H2, SUT Modular design for application flexibility Full descriptions of new or changed features NEW... Read More

Some owners of a 2007-08 Corvette equipped with US8 Radio and U66 Speaker System may comment of an Auto Volume Error message displayed on the radio when the Auto Volume button is pressed. The concern may be intermittent and will occur when the button... Read More