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Service bulletin 99066C

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 id617575
Published by NHTSA2001-03-19
Manufacturer's number99066C
Manufacturer's date2000-11-14
Replaces99066B
NHTSA componentVEHICLE SPEED CONTROL:CRUISE CONTROL

NHTSA's summary

SOME OWNERS OF 1996 - 1998 MODEL YEAR S/T, M/L, C/K, G, P AND W4 TRUCKS, THAT ARE REGISTERED IN CALIFORNIA, EQUIPPED WITH 4.3L, 5.0L OR 5.7L ENGINE, AND CALIFORNIA EMISSIONS, 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

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

Throttle and cruise control

Vehicles listed
CADILLAC C/K SERIES1999
CADILLAC CADILLAC TRUCK
CHEVROLET C/K SERIES1996 to 1999
CHEVROLET CHEVROLET TRUCK
CHEVROLET G SERIES1996
CHEVROLET G SERIES1997 to 1999
CHEVROLET M/L1997 to 1999
CHEVROLET M/L SERIES1996
CHEVROLET P SERIES1996 to 1999
CHEVROLET S/T SERIES1996 to 1999
CHEVROLET W41996, 1997, 1998, 1999
GMC C/K SERIES1996 to 1999
GMC G SERIES1996 to 1999
GMC GMC TRUCK
GMC M/L SERIES1996 to 1999
GMC P SERIES1996 to 1999
GMC S/T SERIES1996 to 1999
GMC W41996, 1997, 1998, 1999
OLDSMOBILE OLDSMOBILE TRUCK
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
99066C2001-03-21. Service bulletin. SOME OWNERS OF 1996 - 1999 S/T, M/L, C/K, G, P AND W4 TRUCKS 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
99066A2000-04-10. Service bulletin. SOME VEHICLES THAT ARE REGISTERED IN CALIFORNIA, EQUIPPED WITH A 4.3L, 5.0L OR 5.7L ENGINE AND CALIFORNIA EMISSIONS, MAY EXPERIENCE A SERVICE ENGINE SOON LIGHT, MISFIRE, ROUGH IDLE OR HARD START. *TT
0006040032000-04-06. Service bulletin. SOME CUSTOMERS MAY COMMENT ON ROUGH IDLE AFTER START UP, AND / OR A SERVICE ENGINE SOON (SES) LIGHT ILLUMINATED. *TT
776306A2000-04-06. Service bulletin. FUEL SOLENOID DRIVER LOCATED ON THE SIDE OF THE FUEL INJECTION PUMP FAILED, CAUSING VEHICLE TO NO START OR STALL.
7671011997-07-24. Service bulletin. DELAYED UPSHIFT (ADJUST ACCELERATOR CABLE/TPS/KICKDOWN SWITCH). *TW