Need help! Misfire and U0401-71 Code?

[speedelevated]

Hi friends!
I am dealing with an issue and really hoping for help. I have been chasing an issue with strange jerking/bucking for a while and tried a list of things but after a transmission reset, my transmission is acting immensely worse and it seems that my transmission is causing the problem. (7K bill, ouch) Anyways, this was the start to the problem. Today it got worse.
The Regal (2.0T) has 144,000 miles on it and today while pulling out of work, I got the dreaded flashing check engine. It was a cylinder 3 misfire!
I ran the full vehicle scan on my OBD2 and a bunch of codes popped up! What are all of these codes?! I’ve never had it pull all of these codes before. After the misfire I restarted the vehicle and it drove fine the rest of the way home, aside from some jumpy RPMs that I think are caused by my slippy transmission. I noticed the heater isn’t working especially well but it works after running full blast for an extended period. I am so confused and concerned. I am supposed to travel home for the holidays tomorrow!

Here are the codes:

ECM:
P0303/P0300-00 Cylinder 3 misfire
P0089-00 Fuel Pressure Regulator Performance

Brakes/ABS:
U0401-71 Invalid Data Received from Engine Control Module - Actuator Stuck

HVAC Control Module:
U0198-00 Lost Communication With Telematic Control Module

HVAC Controls:
B1325-03 Control Module Power Circuit - Low Voltage

Radio
U15E1-00 LIN Bus 14 Lost Communication With Device
B1325-03 Control Module Power Circuit - Low Voltage
U0078-00 Control Module Communication Low Speed CAN Bus Off
U0198-00

Any help is appreciated!!

 

[luke_dubs]

This is a situation where you get a lot of codes, but a good majority of them are caused by one, maybe two codes. Personally, if I was in your shoes, I'd start with that cylinder 3 misfire. See what's causing it, and fix whatever could be wrong. Then, clear the codes and see if any others pop up. Chances are that the ECM codes are the main issues. At least, that's what I think. Hopefully others chime in.

 

[bugspop1]

I agree, if you have a Misfire in Cylinder 3, Clean or Change the Spark Plug
and test the Coil Pack. Those are the first two things I'd check.
Clear you Codes, then move on!