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Service bulletin 677159

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 id51308
Published by NHTSA1997-06-27
Manufacturer's number677159
Manufacturer's date1997-02-01
NHTSA componentELECTRICAL SYSTEM:IGNITION:MODULE

NHTSA's summary

CLUNK NOISE ON ACCELERATION AFTER A CLOSED THROTTLE COAST DOWN (NEW TCC CALIBRATION). *TW

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

Electrical system, Ignition

Vehicles listed
CHEVROLET C SERIES(LIGHT)1996
CHEVROLET G SERIES1996
CHEVROLET P SERIES1996
GMC C SERIES(LIGHT)1996
GMC G SERIES1996
GMC P SERIES1996

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
7665041997-08-21. Service bulletin. MALFUNCTION INDICATOR LIGHT (MIL) ON, POOR DRIVEABILITY CONDITIONS (PERFORM FLASH CALIBRATION). *TW
677153A1997-08-21. Service bulletin. NO UPSHIFT/2ND GEAR ONLY AFTER COLD START-INTERMITTENT DTC 87 - HIGH RATIO ERROR (REPLACE EPROM). *TW
9774L60E13A1997-08-14. Service bulletin. CHUGGLE/SURGE ON TCC APPLY/NO DTC'S (REFLASH THE POWERTRAIN CONTROL MODULE (PCM)). *TW
569603A1997-06-27. Service bulletin. ELECTRICAL INTERFERENCE IN MOBILE (TWO-WAY) RADIO (REPROGRAM VCM-A). *TW