Still trying to get my 2001 SLK320 transmission sorted out. Shifts great when placed in drive, both up and down, and touch shifter works the way it should up and down through gears. Only problem is when I step down to floor on accelerator pedal and engage passing gear, it stays in passing gear and will not shift up to next gear, no matter what. Pull over, shut off engine, remove and reinsert key and start car, and all is as it should be and shifts fine both automatically, and with touch shifter. Does this every time I step down to passing gear. I have searched and researched and have not found any info similar to my problem. Checked passing gear button under pedal and it clicks up and down without sticking, and lastly no codes shown. Transmission fluid is full and appears and smells fresh. Anyone experience anything like this, or know what possible possible problem is?