I recently replaced my 4.7L auto, 2wd, dakota's ecu because of a check engine light (an internal memory check sum error). I purchased a used one with the same part#. When I started it up, the check engine light went away but my abs light started flashing and beeping. I was wondering if there is something I have to reset on the abs system to stop this flashing. I put the old ecu back in, but the abs is still flashing and beeping (annoying). Any help would be appreciated.

 

Check to make sure you connected everything correctly.

 

did you try unhooking the battery for a while? and yes indeed check your conection, it wouldn't hurt to check inside your plugs to make sure none of the pins pulled out of the module when pulling the plug out. corosion can make pins weak, and sticky.