I’m having an issue with the cruise control in our 09 Murano LE with 126,000 miles. Periodically it does not maintain speed when going up hills while travelling on highways. This includes long low grade hills. It is gradual decrease in speed loosing up to 5 or 6 MPH by the time we start to level out. Speedometer and GPS match and the tachometer is holding steady with a slight drop as the vehicle slows.
I think this may possibly be heat related. Most of the trips we make are 180 mile round trip visiting family by mostly highways. When we start out the cruise control works really well. But depending on the temperature the cruise control varies when it starts acting up. We live around the Philadelphia area. During the summer I could get anywhere between 15 to 45 minutes before it started and it still didn’t function properly on the return trip. But in the winter I can get the entire trip out without problems and sometimes the return trip back without problems if we stayed out there for several hours.
The engine is running well and there are no codes. When it slows down I can lightly apply my foot to the accelerator and bring back up to speed. Also there are no power issues when driving without the cruise control. The air cleaner is new and I cleaned the throttle body and sprayed the MAF sensor with MAF cleaner. Still have the original plugs.