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Service bulletin 876506A

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 id615087
Published by NHTSA2000-12-27
Manufacturer's number876506A
Manufacturer's date1998-07-01
Replaces876506
NHTSA componentUNKNOWN OR OTHER

NHTSA's summary

SOME VEHICLES MAY EXHBIT A MALFUNCTION INDICATOR LAMP ILLUMINATION AND POSSIBLY A NO-START CONDITION WITH A P1621 AND / OR A P1336 DIAGNOSTIC TROUBLE CODE SET, AND VARIOUS DIAGNOSTIC TROUBLE CODES RELATED TO THE THEFT DETERRENT SYSTEM. *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.

Trouble codes named

P1336, P1621

Vehicles listed
CHEVROLET S SERIES1998
GMC S SERIES1998

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