2 codes after rear main seal replacement.

[Joey0918]

Just got done with the Rear Main Seal. Now I am running into these two codes....
First code is-P0761-Shift Solenoid C Performance or Stuck Off
Second code-P0778-Pressure Control Solenoid B Electrical

The PRNDS lights are illuminated constantly. What would cause these codes? I know I am currently low on trans fluid and I believe that is the reason the car will not move unless i am at 4K. I am kind of at a loss with this. Any help with this would be greatly appreciated.

[agart]

Did you reconnect the transmission sensors? Don't mean to state the obvious but sometimes it's the obvious things that we forget.

[Joey0918]

Did you reconnect the transmission sensors? Don't mean to state the obvious but sometimes it's the obvious things that we forget.

I did. I triple checked all the connections
ob

[rollerton]

What would cause these codes? I know I am currently low on trans fluid .

I think you answered your own question. Those Solenoids wont function without pressure, and low fluid means no pressure.

[Joey0918]

I think you answered your own question. Those Solenoids wont function without pressure, and low fluid means no pressure.

That would make sense wouldn't it.

I did however run into a major problem last night which resulted in my input shaft going out. Sucks to be me here. 3 time this week pulling the transmission. Oh well. Here we go again.

[bmash3]

I was having the same issues as OP was with the illuminating PRNDS and the check engine light that read code p0778 only. I also knew I was low on trans fluid and that was probably the cause of both the illuminating PRNDS and the check engine light. I got the fluid changed at the dealership (costly as hell but couldn't find anywhere else to do it and it seemed like a difficult DIY) and got them to clear the code. The car's been running pretty normal I would say since with no problems but today the check engine light came back on (again the car seems the be running fine) so I got the code checked and it was p0778 again. I explained how I recently got a trans fluid change done and dude at advanced auto parts said sometimes the code comes back and takes a few days to get cleared but I don't know. Any ideas? I'm afraid it could be a bigger problem but I'm not sure and would very much so appreciate your input.
Driving an 04 A4 1.8T