when ign.on,or running at dead stop,
my truck is in 2wd by default,when i
push the button for 4wd high i can here it
engage and the light comes on as it should,
but when i push the 4 wd low button
i can not here anything, and the light flash's
for about 30 sec.and then goes to 4wd high,
no codes on scan,

03 sierra, ext.cab 5.3
thanks for any help

 

You might have to be in Neutral to engage 4wd Low

 

yes neutral

 

that did it,

thanks
guy's