2008 gen 2 Prius. Car suddnely stopped working. Can start but will not stay running. Codes below

My prius recently stopped working suddenly while driving. After stopping it and trying to restart it it would turn on but not stay running and makes a lot of noise from the engine.


I got the codes read and they came back as:

C1241
C1242
C1311
C1377
C1378


I did check and the Am2 fuse was blown. After replacing it the dash lights returned and the car did run enough to drive forward and backward but after shutting it off again the problems returned.


Googling it brings up the inverter pump being the issue for blown am2 fuse and it not starting but the mechanic i brought it to says no, it's the hybrid battery but i checked the codes online and they all come back as being 12v power issues, brake/abs issues, and master solenoid/ECU issues.

So i am wary of this mechanic as he also said he thought it was the alternator originally (before reading codes) and Prius don't even have an alternator.



The nearest toyota dealership is in Sioux Falls SD, which is almost 110 miles away from me so i am hoping to get some help here before trying to get it towed all the way there.

 

I replaced the 12v with a new one (autozone replaced for free since mine was only 8 months old).

the old one was indeed dead and wouldn't hold a charge.


However this didn't fix the issue.
Car still turns on, red triangle appears, than shuts back off.

The fuse was only blown once
It has not blown since.

 

I will Do so today.

My 12v battery was indeed dead and I got it exchanged with a new one but upon starting the car it still shut off after a minute.

So 12v replacement will likely have removed the C1241 and C1242 codes

I will disconnect the pump and see what happens.

If it still won't start and stay running, would you suggest replacing the abs relays?

 

Just disconnected the inverter pump and same issue.

Car shuts off after a minute. Red triangle is on dash.

So replacing the 12v and disconnecting the pump did not work.
I already have replied all the fuses including the am2 fuse that was originally blown.

Aside from replacing a few of the relays, I'm not sure what else it could be.

If not the 12v or pump, what else could it be?

Should i replace the hybrid battery like the mechanic suggested even though the codes aren't for it?

 

Yes, all codes are for lack of power from the 12v amd for ABS/relays

I called Toyota dealership as well and they agreed its not hybrid battery codes but said they can't say for certain, over the phone, there Is no issue with it.


I already replaced the 12v battery.
Mine was dead (only 11.2) and the new one Is in but the issue persists
The C1421 code will likely be gone now if I read codes again though

I replaced every fuse in the engine fuse box as well
And have disconnected the inverter water pump still it runs for a minute then shuts back off.

The only thing I can think of to still try is to replace the ignition and ABS relays in the engine.

Aside from that what else can I do? If not the pump or 12v? It has a half a tank of gas in it. So it isn't out of gas.

The hybrid battery is down to 1 bar now so that was why I was going to try to replace it with a new one since maybe it's been drained too much to start the gas engine now.

 

I'll try to re-scan this afternoon but i don't think it will give me anything since the 12v was disonnected and replaced which usually erases codes and it won't stay on long enough anymore to go into ready mode to even drive (the read triangle does appear when turned on though).

 

Re scanned and got the following codes:

P3190
C1241
C1242
C1310
C1311
C1378

The only new code is the P3190 code which apparently is for poor engine power. The C1377 code from the first scan went away however.


As stated previously the 12v battery is brand new and tested to work. All fuses have also been replaced.


And i already have tried disconnecting the inverter pump which did not fix the issue.


Any advice on where to go next?

 

Scan codes are:


C1421 =

Low Battery Charge Faulty Battery Faulty Charging System Faulty Skid Control ECU (Brake Actuator Assembly)


C1242 =

• Faulty Battery
• Charging System
• Faulty Master Cylinder Solenoid (Skid Control ECU)

C3110 =

• Hybrid Control System
• Faulty Hybrid Control ECU

C3111 =

Faulty Anti-Lock Brake System (ABS) Main Relay 1 ABS Main Relay 1 harness is open or shorted ABS Main Relay 1 circuit poor electrical connection.


C1378 =

Faulty Skid Control ECU Skid Control ECU harness is open or shorted Skid Control ECU circuit poor electrical connection.

 

So you suggest replacing the hybrid battery? It was full when the issues started but now is down to almost being all white on the display.

 

The hybrid battery is clean and there is no debri or liquids on or near it. I've already disconnected and reconnected it and tested the orange plug to make sure it's in tight and pushed down.

I live in Minnesota, but it is currently summer. No animals have been under the hood and the wiring in the engine are chewed on or scratched apart/torn.

 

Right, i have read the codes online and most are for 12v and abs/relays/ECU.

I already replaced the 12v with a tested bran new one from Autozone and have replaced fuses to ensure none were blown affecting power like the AM2 fuse does for ignition.


Do you think replacing the abs and ignition relay might work? Any ideas you can think of to try?