4l60e transmission harness plug-can it be installed backwards?

[rickpaw]

As title says, can the plug be installed backwards, as in 180* off? I'm getting the codes below, and start to think the trans does not get 12v power. I check the fuse for trans and it's good. Have 12v power at the panel. Ran the car in gear on jackstands, and the trans never shifted. VSS works, as it was showing speed on my Torque app. Fluid level is good. I dropped the pan and replaced the filter. Trans is never been removed from the engine, and it's a dropout from a 01 Silverado.



P0758 shift solenoid b electrical
P0740 tcc solenoid circuit/ open
P0753 shift solenoid A electrical

I did not install the plug when the engine/trans were out of the car, and had to feel my way between the tunnel and trans to put in the plug. It snapped in tight so I thought it went in correctly. Harness is from PSI.