C240 Mercedes with 220k miles. Car was in S (sport mode). I was driving slow on a busy interstate and floored it to change lanes. Something seemed like it slipped and then it went into limp mode in 2nd gear. I drove it about 3 miles, parked it and unhooked the battery cables. I started it and it clunked going into reverse. I got it out on the road and it was still stuck in 2nd gear.
I tried to drive it home about 70 miles so I drove about 50 mph in 2nd gear. Stopped for gas and it went into 1st gear. Unhooked the cables and let it sit for a while still stuck in 1st. Friend cleared all the codes, told me 3rd gear is out of it and it needs a new transmission.The car sat for a week. I started it, put it into reverse (no clunking noise), backed it out and when I took off it was in 1st gear, it shifted into 2nd but still will not shift into 3rd. When I slowed down and stopped it did not go back into 1st it was again stuck in 2nd. Read some articles that indicate it could be electrical.
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