code 37 on 91 ram

can someone tell me what could be the prob with a 37 code(fault in part trottle unlock soileniod driver circuit)? truck runs slightly rich and hesitates a little. just reworked heads and cleaned all carbon out of intake and egr.

also, what is code 45. the chart i have only lists a 44 and a 46 code???

anyone have any idea about this???

37 is your torque converter solenoid lockup/unlock circuit open or short, and 45 is the overdrive solenoid circuit. Chect that your harnes is connected to your trany securely