No gears no codes

[josefdavid]

Sorry for the bad grammar. I've recently had a mechanic use a stethoscope type device and he said there's some whining and waning coming from the black panel that covers the housing for the solenoids. I recall that being able to throw a check engine light if anything and any fault occurred. So I'm still wondering why have no check engine light if a bad solenoid is the cause of the problem......