Ok guys, 99 F350 4x4 7.3 SRW 2 wheel abs. Been having intermittent speedo/od light flashing problem for a while but no abs light coming on. have it at the shop, so far they have replaced tranny & rear diff sensors, ring gear in the rear end was missing a tooth so rebuilt the rear end, still having the same issue. now they are saying its the abs control module which Ford discontinued & no one can rebuild this particular one. My main question is if the module was bad wouldn't the abs light be coming on?
so they are telling me the codes are: po500 vss circuit failure & c1123 vss signal short to ground

 

If the module is bad and the module is responsible for setting codes it is very likely that no code will be set.

 

allegedly they got codes, the advisor was "too busy" to look them up when i called, wow, really? might run by there this evening & have a face to face, or possibly a toe to toe. lol

 

so they are telling me the codes are: po500 vss circuit failure & c1123 vss signal short to ground