My car a Infiniti G 35X with about 230000 Miles on it is not shift when it is supposed to.When I open the throttle at 40 mph the rpm’s jump up to about 6000, this doesn’t happen at lower gears. No extra power is going to the tires. I hooked up a scan tool and was monitoring the data and it said I was only about 2000 RPM. Two of the codes I found for the transmissions wereP1815 M-Mode Switch

P0615 Voltage Level Monitoring I-Shifter Park LED: Open Load

I was trying to look up the codes mean, but I’m having little to no luck. I was just borrowing the scan tool so I didn’t really do anything on it except for look for codes.