Date registered: Sep 2006
Vehicle: ML320 2000
Location: Orange County, CA
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Thank you all for your replies.
I took the car to 3 shops. One of them is Transmeister, which is supposed to be good at this.
All 3 took the car to a drive and then read the codes. Transmeister check the transmission fluid level. He said it is high. None checked the 13 pin connector.
I read the forum before I went. I was aware that the reason could be some of the switches. I asked them that, but none paid attention. They all said the problem is internal.
The thing is when I take the car to them, it is already stuck at the 3rd gear. However, in the morning, it shifts through the gears smoothly. I can drive on the highway with the highest gear at 2000 RPM or so. So, for some reason, transmission computer is getting locked up after a while.
I will look into the 13 pin connector. But, if it was dirty, should not gears work at all in the morning?
Also, sometimes when I put it in Reverse gear, it is not reading. It is sitting at Neutral. Is there something under the gear box that could be bad? But, again, everything works fine in the morning.