Sounds light you need to change the neutral safety switch. You should be able to start it in drive. This could account for the limp mode..
OK thats totally different. Miscomunicatoin, I think. Then just like my dodge truck the solenoid package needs replaced. I have the exact same problem. I can downshift to low and it will start in second , but not first. If i leave it in drive it starts in third. This is just a worn out solenoid package. I am going to take mine out and see if I can find Orings, So I can repolace them all in the package. None of my solenoids are bad, Its just the seals that are bad. This might be your case also. But I would check fuses and the TPS,TRS first. Because this is part of what the TCM uses to control the shifting process. Also check you MAF, this si also part of the process, yet minor.
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Trouble Code: P0846
A/T 2/4 Pressure Switch Circuit Malfunction
Possible Causes:
2/4 pressure is incorrect, or internal transmission faults exist
2/4 pressure switch circuit is open, shorted to ground or power
2/4 pressure switch is damaged or it has failed
TCM relay power circuit to L/R switch is open (loss of B+)
PCM/TCM has failed
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Starting the engine is not the starting I am referring to. I mean starting from a stop, like a red light.
The engine starts fine. The starting I am referring to is like starting from a red light or stop sign then the tranny "starts" in drive not first and never shifts.
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