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Technical Service Bulletins of the 1999 GMC C6

There have been 15 technical service bulletins issued for the 1999 GMC C6.

1 1999 GMC C6 engine TSB (Bulletin 020604026A)

Bulletin Date:	Nov. 1, 2002
Component:	Engine.
Bulletin Summary:	Engine backfire and related driveability issues.
Vehicles covered in this TSB:	1999 Chevrolet B7, 2000 Chevrolet B7, 2001 Chevrolet B7, 2002 Chevrolet B7, 1999 Chevrolet C6, 2000 Chevrolet C6, 2001 Chevrolet C6, 2002 Chevrolet C6, 1999 Chevrolet C7, 2000 Chevrolet C7, 2001 Chevrolet C7, 2002 Chevrolet C7, 1999 GMC B7, 2000 GMC B7, 2001 GMC B7, 2002 GMC B7, 1999 GMC C6, 2000 GMC C6, 2001 GMC C6, 2002 GMC C6, 1999 GMC C7, 2000 GMC C7, 2001 GMC C7, 2002 GMC C7.

2 1999 GMC C6 gasoline engine TSB (Bulletin 020604026)

Bulletin Date:	Jun. 1, 2002
Component:	Gasoline engine.
Bulletin Summary:	This bulletin is being issued to assist technicians in efficiently diagnosing and correcting backfire and other related driveability concerns.
Vehicles covered in this TSB:	1999 Chevrolet B7, 2000 Chevrolet B7, 2001 Chevrolet B7, 2002 Chevrolet B7, 1999 Chevrolet C6, 2000 Chevrolet C6, 2001 Chevrolet C6, 2002 Chevrolet C6, 1999 Chevrolet C7, 2000 Chevrolet C7, 2001 Chevrolet C7, 2002 Chevrolet C7, 1999 GMC B7, 2000 GMC B7, 2001 GMC B7, 2002 GMC B7, 1999 GMC C6, 2000 GMC C6, 2001 GMC C6, 2002 GMC C6, 1999 GMC C7, 2000 GMC C7, 2001 GMC C7, 2002 GMC C7.

3 1999 GMC C6 manual transmission TSB (Bulletin 020729005)

Bulletin Date:	Jun. 1, 2002
Component:	Manual transmission.
Bulletin Summary:	Subject regarding vibration or transmission output shaft damage / oil seal leak on conventional cab medium duty models.
Vehicles covered in this TSB:	1997 Chevrolet C6, 1998 Chevrolet C6, 1999 Chevrolet C6, 2000 Chevrolet C6, 2001 Chevrolet C6, 2002 Chevrolet C6, 1997 Chevrolet C7, 1998 Chevrolet C7, 1999 Chevrolet C7, 2000 Chevrolet C7, 2001 Chevrolet C7, 2002 Chevrolet C7, 1997 GMC C6, 1998 GMC C6, 1999 GMC C6, 2000 GMC C6, 2001 GMC C6, 2002 GMC C6, 1997 GMC C7, 1998 GMC C7, 1999 GMC C7, 2000 GMC C7, 2001 GMC C7, 2002 GMC C7.

4 1999 GMC C6 gasoline engine TSB (Bulletin 000601013A)

Bulletin Date:	May. 1, 2002
Component:	Gasoline engine.
Bulletin Summary:	Information pertaining to the release of the exhaust manifold / turbocharger heat shield.
Vehicles covered in this TSB:	1998 Chevrolet C6, 1999 Chevrolet C6, 2000 Chevrolet C6, 2001 Chevrolet C6, 2002 Chevrolet C6, 1998 Chevrolet C7, 1999 Chevrolet C7, 2000 Chevrolet C7, 2001 Chevrolet C7, 2002 Chevrolet C7, 1998 GMC C6, 1999 GMC C6, 2000 GMC C6, 2001 GMC C6, 2002 GMC C6, 1998 GMC C7, 1999 GMC C7, 2000 GMC C7, 2001 GMC C7, 2002 GMC C7.

5 1999 GMC C6 alternator/generator/regulator TSB (Bulletin 010603003)

Bulletin Date:	Mar. 1, 2001
Component:	Alternator/generator/regulator.
Bulletin Summary:	Some drivers may comment that the generator upper mounting bolt is breaking on certain conventional medium duty models.
Vehicles covered in this TSB:	1996 Chevrolet C6, 1997 Chevrolet C6, 1998 Chevrolet C6, 1999 Chevrolet C6, 2000 Chevrolet C6, 1996 Chevrolet C7, 1997 Chevrolet C7, 1998 Chevrolet C7, 1999 Chevrolet C7, 2000 Chevrolet C7, 1996 GMC C6, 1997 GMC C6, 1998 GMC C6, 1999 GMC C6, 2000 GMC C6, 1996 GMC C7, 1997 GMC C7, 1998 GMC C7, 1999 GMC C7, 2000 GMC C7.

6 1999 GMC C6 windshield wiper/washer TSB (Bulletin 010843002)

Bulletin Date:	Mar. 1, 2001
Component:	Windshield wiper/washer.
Bulletin Summary:	Some customers may comment that the windshield (w/s) washer reservoir shows an unexplained reduced fluid level after vehicle operation.
Vehicles covered in this TSB:	1990 Chevrolet C6, 1991 Chevrolet C6, 1992 Chevrolet C6, 1993 Chevrolet C6, 1994 Chevrolet C6, 1995 Chevrolet C6, 1996 Chevrolet C6, 1997 Chevrolet C6, 1998 Chevrolet C6, 1999 Chevrolet C6, 2000 Chevrolet C6, 2001 Chevrolet C6, 1990 Chevrolet C7, 1991 Chevrolet C7, 1992 Chevrolet C7, 1993 Chevrolet C7, 1994 Chevrolet C7, 1995 Chevrolet C7, 1996 Chevrolet C7, 1997 Chevrolet C7, 1998 Chevrolet C7, 1999 Chevrolet C7, 2000 Chevrolet C7, 2001 Chevrolet C7, 1990 GMC C6, 1991 GMC C6, 1992 GMC C6, 1993 GMC C6, 1994 GMC C6, 1995 GMC C6, 1996 GMC C6, 1997 GMC C6, 1998 GMC C6, 1999 GMC C6, 2000 GMC C6, 2001 GMC C6, 1990 GMC C7, 1991 GMC C7, 1992 GMC C7, 1993 GMC C7, 1994 GMC C7, 1995 GMC C7, 1996 GMC C7, 1997 GMC C7, 1998 GMC C7, 1999 GMC C7, 2000 GMC C7, 2001 GMC C7.

7 1999 GMC C6 brake antilock abs warning light TSB (Bulletin 000525004)

Bulletin Date:	Dec. 1, 2000
Component:	Brake antilock abs warning light.
Bulletin Summary:	Some drivers may comment about the abs lamp illuminating. An abs diagnostic trouble code 0281 - brake switch circuit may have been set on those vehicles equipped with hydraulic brakes. The diagnostic trouble code will be stored in memor
Vehicles covered in this TSB:	1995 Chevrolet B7, 1996 Chevrolet B7, 1997 Chevrolet B7, 1998 Chevrolet B7, 1999 Chevrolet B7, 2000 Chevrolet B7, 1995 Chevrolet C6, 1996 Chevrolet C6, 1997 Chevrolet C6, 1998 Chevrolet C6, 1999 Chevrolet C6, 2000 Chevrolet C6, 1995 Chevrolet C7, 1996 Chevrolet C7, 1997 Chevrolet C7, 1998 Chevrolet C7, 1999 Chevrolet C7, 2000 Chevrolet C7, 1995 GMC B7, 1996 GMC B7, 1997 GMC B7, 1998 GMC B7, 1999 GMC B7, 2000 GMC B7, 1995 GMC C6, 1996 GMC C6, 1997 GMC C6, 1998 GMC C6, 1999 GMC C6, 2000 GMC C6, 1995 GMC C7, 1996 GMC C7, 1997 GMC C7, 1998 GMC C7, 1999 GMC C7, 2000 GMC C7.

8 1999 GMC C6 gasoline engine TSB (Bulletin 000604047)

Bulletin Date:	Nov. 1, 2000
Component:	Gasoline engine.
Bulletin Summary:	Some medium duty models with 3126 caterpillar diesel engine and allison automatic transmission may exhibit an engine speed power takeoff (pto) operation returning to idle for no apparent reason.
Vehicles covered in this TSB:	1998 Chevrolet C6, 1999 Chevrolet C6, 2000 Chevrolet C6, 2001 Chevrolet C6, 1998 Chevrolet C7, 1999 Chevrolet C7, 2000 Chevrolet C7, 2001 Chevrolet C7, 1998 GMC C6, 1999 GMC C6, 2000 GMC C6, 2001 GMC C6, 1998 GMC C7, 1999 GMC C7, 2000 GMC C7, 2001 GMC C7.

9 1999 GMC C6 automatic transmission cooling unit and lines TSB (Bulletin 00070)

Bulletin Date:	Oct. 31, 2000
Component:	Automatic transmission cooling unit and lines.
Bulletin Summary:	General motors has decided that a defect which relates to motor vehicle safety exists in certain medium duty vehicles. Some of these vehicles exhibit a condition in which transmission fluid may leak from a heat degraded transmission fluid
Vehicles covered in this TSB:	1999 Chevrolet B7, 2000 Chevrolet B7, 1999 Chevrolet C6, 2000 Chevrolet C6, 1999 Chevrolet C7, 2000 Chevrolet C7, 1999 GMC B7, 2000 GMC B7, 1999 GMC C6, 2000 GMC C6, 1999 GMC C7, 2000 GMC C7.

10 1999 GMC C6 automatic transmission cooling unit and lines TSB (Bulletin 00070)

Bulletin Date:	Sep. 1, 2000
Component:	Automatic transmission cooling unit and lines.
Bulletin Summary:	Subject regarding transmission oil cooler line degradation.
Vehicles covered in this TSB:	1999 Chevrolet B7, 2000 Chevrolet B7, 1999 Chevrolet C6, 2000 Chevrolet C6, 1999 Chevrolet C7, 2000 Chevrolet C7, 1999 GMC B7, 2000 GMC B7, 1999 GMC C6, 2000 GMC C6, 1999 GMC C7, 2000 GMC C7.

11 1999 GMC C6 clutch assembly TSB (Bulletin 000731001)

Bulletin Date:	Sep. 1, 2000
Component:	Clutch assembly.
Bulletin Summary:	Experiencing noisy release bearing, slipping clutch or inoerative clutch.
Vehicles covered in this TSB:	1993 Chevrolet B7, 1994 Chevrolet B7, 1995 Chevrolet B7, 1996 Chevrolet B7, 1997 Chevrolet B7, 1998 Chevrolet B7, 1999 Chevrolet B7, 2000 Chevrolet B7, 1990 Chevrolet C6, 1991 Chevrolet C6, 1992 Chevrolet C6, 1993 Chevrolet C6, 1994 Chevrolet C6, 1995 Chevrolet C6, 1996 Chevrolet C6, 1997 Chevrolet C6, 1998 Chevrolet C6, 1999 Chevrolet C6, 2000 Chevrolet C6, 1990 Chevrolet C7, 1991 Chevrolet C7, 1992 Chevrolet C7, 1993 Chevrolet C7, 1994 Chevrolet C7, 1995 Chevrolet C7, 1996 Chevrolet C7, 1997 Chevrolet C7, 1998 Chevrolet C7, 1999 Chevrolet C7, 2000 Chevrolet C7, 1993 GMC B7, 1994 GMC B7, 1995 GMC B7, 1996 GMC B7, 1997 GMC B7, 1998 GMC B7, 1999 GMC B7, 2000 GMC B7, 1990 GMC C6, 1991 GMC C6, 1992 GMC C6, 1993 GMC C6, 1994 GMC C6, 1995 GMC C6, 1996 GMC C6, 1997 GMC C6, 1999 GMC C6, 2000 GMC C6, 1990 GMC C7, 1991 GMC C7, 1992 GMC C7, 1993 GMC C7, 1994 GMC C7, 1995 GMC C7, 1996 GMC C7, 1997 GMC C7, 1998 GMC C7, 1999 GMC C7, 2000 GMC C7.

12 1999 GMC C6 structure TSB (Bulletin 000863001)

Bulletin Date:	Feb. 1, 2000
Component:	Structure.
Bulletin Summary:	Some vehicles may experience on the cab assist step cracking around the mounting bolts.
Vehicles covered in this TSB:	1995 Chevrolet C6, 1996 Chevrolet C6, 1997 Chevrolet C6, 1998 Chevrolet C6, 1999 Chevrolet C6, 2000 Chevrolet C6, 1995 Chevrolet C7, 1996 Chevrolet C7, 1997 Chevrolet C7, 1998 Chevrolet C7, 1999 Chevrolet C7, 2000 Chevrolet C7, 1995 GMC C6, 1996 GMC C6, 1997 GMC C6, 1998 GMC C6, 1999 GMC C6, 2000 GMC C6, 1995 GMC C7, 1996 GMC C7, 1997 GMC C7, 1998 GMC C7, 1999 GMC C7, 2000 GMC C7.

13 1999 GMC C6 structure TSB (Bulletin 000863001A)

Bulletin Date:	Feb. 1, 2000
Component:	Structure.
Bulletin Summary:	Some owners may comment on the cab assist step cracking around the mounting bolts.
Vehicles covered in this TSB:	1995 Chevrolet C6, 1996 Chevrolet C6, 1997 Chevrolet C6, 1998 Chevrolet C6, 1999 Chevrolet C6, 2000 Chevrolet C6, 1995 Chevrolet C7, 1996 Chevrolet C7, 1997 Chevrolet C7, 1998 Chevrolet C7, 1999 Chevrolet C7, 2000 Chevrolet C7, 1995 GMC C6, 1996 GMC C6, 1997 GMC C6, 1998 GMC C6, 1999 GMC C6, 2000 GMC C6, 1995 GMC C7, 1996 GMC C7, 1997 GMC C7, 1998 GMC C7, 1999 GMC C7, 2000 GMC C7.

14 1999 GMC C6 cooling system radiator assembly TSB (Bulletin 990620014)

Bulletin Date:	Jul. 1, 1999
Component:	Cooling system radiator assembly.
Bulletin Summary:	On some medium duty conventional models, the radiator surge tank cap contacting underside of hood.
Vehicles covered in this TSB:	1998 Chevrolet C6, 1999 Chevrolet C6, 1998 Chevrolet C7, 1999 Chevrolet C7, 1998 GMC C6, 1999 GMC C6, 1998 GMC C7, 1999 GMC C7.

15 1999 GMC C6 engine TSB (Bulletin 990604022)

Bulletin Date:	Jul. 1, 1999
Component:	Engine.
Bulletin Summary:	Concerns with the coolant alarm and oil pressure alarm activating when the vehicle is stopped and the engine returns to idle.
Vehicles covered in this TSB:	1999 Chevrolet B7, 1999 Chevrolet C6, 1999 Chevrolet C7, 1999 GMC B7, 1999 GMC C6, 1999 GMC C7.

Also see GMC vehicle common problems.

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