Today while driving the van on the freeway at 55mph, stopped at a red light. Went to go, van didn’t shift and that was when I knew it was in limp mode.
Code P0750. “shift solenoid A”.
Is this how these things like this fail? I expected to experience some sort of shifting issue, or some precursor before it just fails like that.
I found a few breakdowns on the net for the solenoid pack plug pin diagrams. I tested each solenoid, and it was at 2 Ohms resistance all across, which electrically, is acceptable from what I’m reading.
The weird thing is, when I clear the codes and disconnect the battery, the van shows no codes until I start it. The code shows up within seconds. How does the vehicle know this solenoid is bad, without sending it a command and it failing to actuate?
If I do the above, ( clear the code) and start the van and put in in drive real fast, It goes into 1st gear, as indicated on the dash and physically you can feel the van go into gear as normal. Seconds later, the gear selector flashes, Goes into D and then disengages and harshly reengages.
I’m imaging the van going into 1st as normal before that code is set, coming up with that code, then disengaging 1st and going full line pressure and going into 2nd, or limp mode.
I have read around, and I understand it isn’t always the solenoid pack, which is why I wanted to Ohm test it, I expected a no brainer answer, showing one of them bad, but that isn’t the case.
Does anyone know how this vehicle KNOWS error code P0750 exists, without the vehicle being driven, put in drive, or any other thing other than starting it and 2 seconds later it popping up?
My point is, I feel like its wire or ECM related. I want to properly diagnose this issue and not just throw parts on it.
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