is on WHY ?! can it be read by a computer ?
I recently changed my alternator and now the warning light on traction control on 2004 Pontiac Grand Prix GTP
Short anwser is it may have nothing to do with alternator...but codes can be read with a few scanners but not all.
you may need to reset the computer...all you have to do to re-set is remove the neg cable from your battery for 10 min. and then reconnect. hope this helps