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Service bulletin 00503

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 id10005760
Published by NHTSA2004-03-15
Manufacturer's number00503
Manufacturer's date2003-12-04
NHTSA componentSERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP

NHTSA's summary

VSC LIGHT ON CONDITION WITH DIAGNOSTIC TROUBLE CODE C1203 IN THE SKID CONTROL COMPUTER MEMORY. A MODIFICATION TO THE SKID CONTROL COMPUTER LOGIC HAS BEEN MADE TO PREVENT THIS CONDITION. *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

Brakes, Anti-lock brakes

Trouble codes named

C1203

Vehicles listed
TOYOTA 4 RUNNER2003

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
50542005-09-02. Service bulletin. DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM (FROM NOVEMBER, 2002). 00400-RM105-9U1. 00400-RM100-1U1. *TT
44022005-08-20. Service bulletin. ABS WITH EBD & BA & TRAC & VSC SYSTEM (DIAGNOSTICS). REPAIR MANUAL CORRECTION. 2003 4RUNNER. 00400-RM100-1U1. *TT
44702005-07-28. Service bulletin. REPAIR MANUAL CORRECTION - ABS WITH EBD & BA & TRAC & VSC SYSTEM (DIAGNOSTICS). 00400-RM100-1U1. *TT