Whats the problem? You title the thread "Service Park Assist System" but say absolutely nothing about that, and just mention you have a loss of power and not being able to accelerate while on the highway.
Yes, what engine you have could make a BIG difference.
Can you provide a little more detail to the symptoms, whats the actual problem you're talking about?
The problem has happened year round. We bought the vehicle used. When you start it up, and put it into reverse, It gets boxes around PRND and the information center displays "Service Park Assist System" then you pull it down into drive and attempt to accelerate and there is no power, and the vehicle won't leave first gear or go more then 15mph. You come to a stop, put it in park, shut the car down, and start it back up, pull it into drive and its gone.
It will also happen when you are driving 65mph down the highway, you'll hear the warning chime, it gets boxes around PRND and you can't accelerate at all. The information center says service park assist system and eventually the transmission will clunk and the check engine light comes on, and the vehicle drives fine. You shut the car off and start it back up and the check engine light is off. It happens spiratically, you can't just make it do it. We have sense turned off the parking sensors in an attempt to bypass this happening and it will still do it.
What is the problem with the Park Assist System?
Good question. We don't know of any and have sense turned it off.
What Year is your Vehicle?
What Trim Level is your Vehicle?
What Transmission does your Vehicle have?
What Drivetrain System does your Vehicle have?
HOW many miles do you have on the vehicle?
2007 Jeep Commander 3.7L V6 Sport package. Stock automatic transmission, Stock drivetrain system, and right at 52k.
Have your reviewed the maintenance schedule in your Owner's Manual and made sure you have performed the required servicing/maintenance when its called for? If NOT have you at least performed it late and got it all kept up on the maintenance?
Yes, we service it regularly and anything that is needed at the time, we do.
Hopefully that helps. I know other people have had the problem, thats why I didn't elaborate too much on it. Sorry for the confusion.