Service bulletins for the 1999 GMC W4
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.
16 on file from NHTSA, as of 2026-10-19.
By type
By component
Only bulletins with component: Fuel system are shown. Show all
| 99066C | 2001-05-10. Service bulletin. FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS. SOME VEHICLES MAY EXPERIENCE A SERVICE ENGINE SOON LIGHT, MISFIRE, ROUGH IDLE OR HARD START DUE TO A DEPOSIT BUILD-UP ON THE SEQUENTIAL CENTRAL PORT FUEL INJECTOR (SCPI) POPPET VALVE(S). *TT |
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| 98048 | 1999-01-05. Service bulletin. FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM. VEHICLES EXHIBIT A CONDITION IN WHICH THE INJECTION PUMP GEAR MAY CONTAIN A MACHING BURR ON THE GEAR SURFACE. *YC |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.