2001 Dodge Ram 2500 4x4 5.9L gas,
If a tps and map were both bad or
either one defective on its own,
Would that cause a vehicle to not
shift into gear?
Yes, the Map sensor would control the vacume pressure responsible for shifting.
Yes, the Map sensor would control the vacume pressure responsible for shifting which is part of the process taking place up at the throttle body
Those trans don't shift on vacuum. They are fully electronically controlled and throttle position is transmitted by a cable from the throttle body to the trand. It probably needs the shift solenoid/ transducer/lock up solenoid kit replaced. Done quite a few myself.
As a side note, NEVER has Chrysler used vacuum to shift a trans
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