2010 Prius error codes C1241, U0073 and P0517

My check engine light had been on steady for a long while and i didn,t really bother because the car drives fine and torque didnt not pick the codes. Recently, i got the mini vci and ran a health check and it pulled the following codes.

i read that C1241 means that the 12V power supplied to the ECU was abnormally low and i know that the car had a dent at the rear near the 12V battery section. Could it really be the brake power supply that could be causing this error. now the car feels like i am going to hit someone when i sometimes hit the brake.

Also i search this forum and didn't get any information on P0517, what could this mean?

 

12v battery was changes January 2014, I couldn't get the OEM Battery or Optima so I used a regular battery that fits...
Diagnostics check on IG Off started at 11.9 V and gradually declined to 11.4v after 2 minutes

I recall now that I once saw the brake power supply taped with a black tape (didn't know what it was then.... I will recheck it to be double sure.

 

Owned the car for 14 months, I got it when the mileage was 65000 and now it is 80756 miles

 

@macman I earlier had some prius knocking sound issue in the mornings and engine hesitation while driving, I took the car for a scan and it threw up misfire codes on cylinders 1 to 3. I initially used heet water remover additive and it reduced the knocking sound duration but the codes stayed, then i read here about the intake manifold cleaning campaign and implemented that. I cleared the codes afterwards but the misfire on cylinder 1 stayed. The car drives fine by the way.So I decided to use chevron pro Gard addictive to clean the injectors, which I am doing now, after a while I will clear the code and see if it stays then if it does, I intend to change the spark plugs....I hope this is a good line of action though.

 

@friendly_jacek, yes i did the ERG cleaning as illustrated in the post which i had read earlier. The EGR piping was clogged, i passed a small toothbrush through the piping to clean it up (i used petrol),cleaned the intake valve and MAF sensor (i used CRC mass air flow cleaner) . I didn't take the manifold out but tried to reach all four manifold cylinders and the small hole leading to the engine.

 

@macman408, You were definitely right on this, i looked at the 12 v battery section to check for corrosion and loose connection and i found not only did i have some corrosion issue, it appears that the brake power control may be faulty (is there a way to test this) and the other connector to the skid control has been severed so there is no connection so to speak.

I am going to need some help on this and to think that i driven the car like this since.

I have checked ebay and amazon for a replacement brake power supply but found nothing for the 2010.



power sup