Car is throwing a ton of codes and I have no idea where to begin

papertowel

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Buick Ownership
2013 regal turbo premium 3
I was driving around and pushing the car hard when all of a sudden it started to brake and then immediately gave an engine light and a service stabilitrak warning while also cutting the engines power. I managed to limp the car back home and the next day I got a code reader and it gave me 6 different codes, 2 for power train and 4 for chassis (pictures included). I have been suspicious something might be wrong with the car for a while now because of a few things. first of all my range has dropped significantly, when I fill up the tank completely it says my range is around 280 miles give or take about 20 when it should be closer to about 400 and I have had to fill it up way more often then normal. secondly it has been having problems cranking in the morning. it will sit and struggle for a couple of seconds before firing up and its only for the first time you start it each day, after that it starts just fine until the next day. I do not know if it is possibly the cold temps we have had recently but it seems to do it even when its not that cold out. the car also at times feels like it has less power then it should but that could just be placebo. I would think it would be something with the fuel pressure regulator or the pump its self seeing as those are signs of them going bad plus the fact that the code it gives me is for that, but what is confusing is why it also threw so many other electrical codes at the same time. I am pretty stumped at the moment and I have no clue where to begin diagnosing the issue.

Screenshot_20250127_150620_RepairSol2.jpg, Screenshot_20250127_150613_RepairSol2.jpg

Powertrain codes:
P0089-00
P228c-00

Chassis codes
EBCM:
U0073-00
C0242-00
MAASM:
U0121-00
PBCM:
C0561-71
 
I do not remember exactly when we replaced it last but it is relatively recent like less then a year ago, maybe about 8 months ago?
 
Still wouldn't hurt to go have your Battery Checked (even if it's not a year old).
Most Automotive Parts Stores will check it for you for free (AutoZone, Advance Auto,
O'reily's, NAPA, etc...).
 
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I was driving around and pushing the car hard when all of a sudden it started to brake and then immediately gave an engine light and a service stabilitrak warning while also cutting the engines power. I managed to limp the car back home and the next day I got a code reader and it gave me 6 different codes, 2 for power train and 4 for chassis (pictures included). I have been suspicious something might be wrong with the car for a while now because of a few things. first of all my range has dropped significantly, when I fill up the tank completely it says my range is around 280 miles give or take about 20 when it should be closer to about 400 and I have had to fill it up way more often then normal. secondly it has been having problems cranking in the morning. it will sit and struggle for a couple of seconds before firing up and its only for the first time you start it each day, after that it starts just fine until the next day. I do not know if it is possibly the cold temps we have had recently but it seems to do it even when its not that cold out. the car also at times feels like it has less power then it should but that could just be placebo. I would think it would be something with the fuel pressure regulator or the pump its self seeing as those are signs of them going bad plus the fact that the code it gives me is for that, but what is confusing is why it also threw so many other electrical codes at the same time. I am pretty stumped at the moment and I have no clue where to begin diagnosing the issue.

Screenshot_20250127_150620_RepairSol2.jpg, Screenshot_20250127_150613_RepairSol2.jpg

Powertrain codes:
P0089-00
P228c-00

Chassis codes
EBCM:
U0073-00
C0242-00
MAASM:
U0121-00
PBCM:
C0561-71
I'd start with fuses
 
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