HiCustomer welcome to Just Answer. I'm acuramstr.This is a very common problem on this model. You have a bad speed sensor. Acura makes a kit for repairing this problem. It is not a hard thing to replace but you need a set of tamper proof torques bits to get the cover off. The part number of the kit is 06560-PY3-000 . It is located in the front of the differential next to the oil filter . Here are the instructions for replacement.