There have been 12 technical service bulletins issued for the 1998 GMC C6.
| 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.
|
| 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.
|
| 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.
|
| 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,
|
| 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,
|
| 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.
|
| Bulletin Date: | May. 1, 2000 |
| Component: | Exterior lighting. |
| Bulletin Summary: | On some medium duty trucks equipped with a diesel engine, air brakes, and the engine shutdown feature, the multi-function alarm module may not perform certain features such as: no warning tone for air brake low pressure; no warning tone f |
| Vehicles covered in this TSB: |
1998 Chevrolet C6,
1998 Chevrolet C7,
1998 Chevrolet T6 Series,
1998 Chevrolet T7 Series,
1998 GMC C6,
1998 GMC C7,
1998 GMC T-series,
1998 GMC T7 Series.
|
| 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.
|
| 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.
|
| 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.
|
| Bulletin Date: | Nov. 1, 1998 |
| Component: | Automatic transmission. |
| Bulletin Summary: | Erratic or premature upshifts, harsh down shifts, engine lugging, or low power performance. |
| Vehicles covered in this TSB: |
1998 Chevrolet B7,
1998 Chevrolet C6,
1998 Chevrolet C7,
1998 GMC B7,
1998 GMC C6,
1998 GMC C7.
|
| Bulletin Date: | Jul. 1, 1998 |
| Component: | Service brakes. |
| Bulletin Summary: | Some vehicles equipped with air brakes and anti-lock brake systems, may exhibit brake control electrical harness chafing. |
| Vehicles covered in this TSB: |
1998 Chevrolet B7,
1998 Chevrolet C6,
1998 Chevrolet C7,
1998 GMC B7,
1998 GMC C6,
1998 GMC C7.
|
Also see
GMC vehicle common problems.