1998 Cadillac EL Dorado

Since it is a fault that occurs dynamically, that adds some difficulty in determining who is at fault. The only possibility of narrowing it down almost in certainty, is to change the wiring at the EBTCM. By that I mean making the RF the LF, and making the RR the LR. This is not an easy task, and in the wrong hands, can cause coincidental problems and frustration. The other possibility in narrowing it down somewhat, is swapping the hub(s) from side to side. The only problem with this, is if the same faults set, then you've only ruled out the hubs. If you swap the wiring at the EBTCM and the faults are the same, you've pretty much isolated all but the EBTCM. If you want to try, swap one hub and see what happens. It is your choice front or rear, the level of involvement is about a push.