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Odd tiptronic behavior

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This morning I took a turn a bit too fast and almost lost control of the vehicle. PSM worked overtime to save my butt by helping me correct the oversteer and slow the car down (Carrera 4S). I know I should be more careful, and this is definitely a learning lesson regarding the limits of adhesion on the car.

After I got the car pointed straight, I gently got back on the gas pedal, but the transmission behaved as if it was in neutral (gear selector and dash light indicated "D". Three more blips of the accelerator and still no go. I decided to coast to a stop (about 100 feet), put it in neutral (with foot on the brake), waited two seconds, put the car back in "D" and then it behaved normally (starting in 2nd gear, no flashing lights, no slipping). Drove the car for a while and everything was back to normal.

A few hours later, I was testing out the brakes and wouldn't you know it, after a hard stop, again the same problem.

Called the mechanic, he says it may be a valve of some sorts or low/old transmission fluid. He is booked solid until the end of next week, but I am curious as to this odd behavior. I have done many hard stops before and never had any tranny issue.

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