The compliance date for vehicle manufacturers consist of a phase-in starting September 1, 2008:
“ All new light vehicles must be equipped with an ESC system that meets the requirements of the standard by September 1, 2012.” Page 3 of the FMVSS 126.
Currently vehicle manufacturers equipped about 26% of model year 2006 light vehicles sold in the US with ESC. An increase to 71% is expected by model year 2011 with 100% ESC equipped vehicles by model year 2012.
This applies to roadworthy vehicles with a gross weight rating of 4,536 kg (10,000 lbs) or less.