Can a bad speed sensor trip the ETAX Relay 98 Plymouth Grand Voyager?

its a 3.0 v6 transmission type Ultradrive 41TE. I know the speed sensor was bad. But the "smart people" at AAMCO wouldn't change it. When i would drive it jumps around. fall to 0 MPH and the tcm throws a code putting it into "limp mode" but if you do it 10 -15 times a day it pops the ETAX- relay And im not going to because its under warranty. And its lifetime so im not messing with it. but is that possible? what could continuously trip it?