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Service bulletins for the 1999 GMC T-Series

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.

53 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

Only bulletins with component: Engine are shown. Show all

Bulletins, newest first
0306040142003-04-15. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:DIESEL. OIL PRESENT AROUND TURBO AREA, OIL LEVEL LOW, OIL PRESSURE GAUGE MAY DROP. *TT
0206040602003-03-28. Service bulletin. ENGINE AND ENGINE COOLING. AUTOMATIC ENGINE SHUTDOWN FEATURE. *TT
0206010242002-10-09. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE. ON CERTAIN VEHICLES, SUCH AS THE CHEVROLET AND GMC WT 5500 MEDIUM DUTY TILT CAB MODELS, THE ENGINES MAY EXPERIENCE ROCKER ARM DAMAGE OR ROCKER BRIDGE DAMAGE FOLLOWING OVERHAUL OF THE CYLINDER HEAD IF THE VALVE BRIDGE STUD INSTALLED DEPTH IS INCORRECT. *TT
0206030022002-06-10. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:DIESEL. CUSTOMERS MAY COMPLAIN THAT THE ENGINE WILL NOT START. *JG
0206030022002-05-21. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:DIESEL. CUSTOMERS MAY COMPLAIN THAT THE ENGINE WILL NOT START. *SLC
0206040062002-04-02. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE. SOME CUSTOMERS MAY COMMENT ON SERVICE ENGINE SOON LAMP ON, MALFUNCTION INDICATOR LAMP ILLUMINATIONS INTERMITTENTLY, DIAGNOSTIC TROUBLE CODE SET, BLOWN FUSES, AND ENGINE WILL NOT START. *TT
000601023A2002-03-25. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE. INFORMATION USED WHEN DIAGNOSING NOISE CONDITIONS SUCH AS ENGINE RATTLE NOISE, SPARK KNOCK AT 2000 - 2500 RPM RANGE, UNDER A MODERATE TO HEAVY LOAD WITH A WARMED UP ENGINE. *TT
99066D2002-03-25. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE. SOME OWNERS MAY EXPERIENCE A SERVICE ENGINE SOON LIGHT, MISFIRE, ROUGH IDLE ORHARD START DUE TO A DEPOSIT BUILD-UP ON THE SEQUENTIAL CENTRAL PORT FUEL INUJECTOR (SCPI) POPPET VALVE(S). *TT
000604003A2002-03-22. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE. SOME CUSTOMERS MAY COMMENT ON ROUGH IDLE AFTER START UP, ESPECIALLY AFTER SETTING OVERNIGHT. *TT
0106020112002-02-15. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE. INFORMATION REGARDING CHEVROLET AND GMC 6-7F MEDIUM DUTY TILT CAB MODELS WITH ISUZU DIESEL ENGINE, ENGINE OVERHEATS, TEMPERATURE GAUGE READS HOT, AUDIBLE WARNING ALARM SOUNDS, AND CHECK GAUGE LAMP ON. *YH
8665032000-12-27. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. SOME VEHICLES MAY SET A FALSE OBD II WITH DIAGNOSTIC TROUBLE CODE P1404. *TT
0006040142000-10-11. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE. SOME CUSTOMERS MAY COMMENT ON HARD, NO, OR SLOW START, BACKFIRE OR KICKBACK DURING CRANK / START, GRINDING OR UNUSUAL NOISES DURING CRANK, DIAGNOSTIC TROUBLE CODE P0338. *TT
99066B2000-07-25. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE. SOME OWNERS MAY EXPERIENCE A SERVICE ENGINE SOON LIGHT, MISFIRE, ROUGH IDLE OR HARD START. **MR
990782000-04-06. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE. CERTAIN VEHICLES EQUIPPED WITH DIESEL ENGINES MAY EXHIBIT ENGINE AIR INDUCTION CONTAMINATION. *TT
9906010202000-01-14. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE. SOME CUSTOMERS MAY COMMENT ABOUT A KNOCKING OR GRINDING NOISE WITH THE ENGINE RUNNING. *TT
9906010202000-01-11. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE. VEHICLES MAY EXHIBIT A KNOCKING OR GRINDING NOISE WITH THE ENGINE RUNNING. *TT
866503A1999-03-08. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. SUBJECT REGARDING OBD II DIAGNOSTIC TROUBLE CODE (DTC) P1404 (REFLASH VCM). *YC

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.