Transmission on 1998 Honda Passport

The transmission lite did not come on until they reflushed the transmission, after we had it towed over 100 miles, from it being serviced 2 days prior, and when we took it back to repair shop, they reflushed put 9.1 qts. the transmission lite now comes on and sometimes sounds like it is slipping when you accelerate. Do I need a new transmission. Could it be the ECM..Where is the ECM located? Thank you.

Asked by for the 1998 Honda Passport
It's hard to say if you need a transmission or not. I have only seen one transmission go bad in a Passport and they tend to be trouble free. The biggest problem I see is an fluid level issue. I would make sure that the oil level is correct first and if so it will most likely have to be diagnosed to find the problem.