"Since last month the throttle body signal came on."
Pardon my ignorance. I know what a throttle body is/does, but what’s a “throttle body signal” ?
The car’s computer must be storing at least one DTC (diagnostic trouble code). Is that the case? Do you know specifically which code(s) are involved?
P.S. I hope you misspoke when you said you are getting advice from a “body shop.” I would think you meant service/repair shop.
CSA