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Service bulletin 051903

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 id10003652
Published by NHTSA2003-10-28
Manufacturer's number051903
Manufacturer's date2003-05-19
NHTSA componentELECTRICAL SYSTEM

NHTSA's summary

2003 MODEL YEAR CK TRUCKS AND G-VANS WITH GREATER THAN 8600 GVW AND MANUAL HVAC CONTROLS MAY SET A DIAGNOSTIC TROUBLE CODE C0550 AND TURN ON THE ANTI-LOCK BRAKE SYSTEM (ABS) TELLTALE LAMP ON THE INSTRUMENT PANEL. *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

Electrical system

Trouble codes named

C0550

Vehicles listed
CHEVROLET CHEVROLET2003

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