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Service bulletin 99066B

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id613602
Published by NHTSA2000-07-25
Manufacturer's number99066B
Manufacturer's date2000-05-01
Replaces99066A
NHTSA componentENGINE AND ENGINE COOLING:ENGINE:GASOLINE

NHTSA's summary

SOME OWNERS MAY EXPERIENCE A SERVICE ENGINE SOON LIGHT, MISFIRE, ROUGH IDLE OR HARD START. **MR

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Engine

Vehicles listed
CADILLAC K SERIES1999
CHEVROLET C SERIES1996 to 1999
CHEVROLET G SERIES1996
CHEVROLET G SERIES1997 to 1999
CHEVROLET K SERIES1996 to 1999
CHEVROLET L SERIES1996 to 1999
CHEVROLET M SERIES1996 to 1999
CHEVROLET P SERIES1996 to 1999
CHEVROLET S SERIES1996 to 1999
CHEVROLET T SERIES1996
CHEVROLET T SERIES1997, 1998, 1999
CHEVROLET W41996, 1997, 1998, 1999
FORD L SERIES1996
FORD L SERIES1999
GMC C SERIES1996 to 1999
GMC G SERIES1996 to 1999
GMC K SERIES1996 to 1999
GMC L SERIES1997 to 1998
GMC M SERIES1996 to 1999
GMC P SERIES1996 to 1999
GMC S SERIES1996 to 1999
GMC T SERIES1996
GMC T SERIES1997, 1998, 1999
GMC W41996, 1997, 1998, 1999
OLDSMOBILE T SERIES1996 to 1998

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
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000604003B2003-04-28. Service bulletin. ROUGH IDLE AFTER START, AND/OR A SERVICE ENGINE SOON (SES) LIGHT. VARIOUS MODELS INCLUDING THE 1995 CHEVROLET AND GMC S/T MODELS. *TT
0306040142003-04-15. Service bulletin. OIL PRESENT AROUND TURBO AREA, OIL LEVEL LOW, OIL PRESSURE GAUGE MAY DROP. *TT
0206040602003-03-28. Service bulletin. AUTOMATIC ENGINE SHUTDOWN FEATURE. *TT
0206010242002-10-09. Service bulletin. 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. CUSTOMERS MAY COMPLAIN THAT THE ENGINE WILL NOT START. *JG
0206030022002-05-21. Service bulletin. CUSTOMERS MAY COMPLAIN THAT THE ENGINE WILL NOT START. *SLC
0206040062002-04-02. Service bulletin. 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. 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. 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