Triangle of Death and other warning lights...

welcome!

how many miles on her?

when you changed the 12v, you reset the trouble codes, and the car is able to be driven until they detect the problem again.
you will probably have to have a dealer read them with the proper diagnostic software. but first, open the inverter fluid reservoir and see if there is any movement in the fluid.

 

I just had the same thing happen. I replaced the inverter coolant pump about four months ago and the whole battery about a month ago. Not sure what else it could be. I have 160k miles.

 

I did the DIY test procedure for the 12v battery. It showed 11.9 when I first pushed the button and went to 12v. Then when II pushed the power button again, it stayed at 12V. I could not go to ready mode, due to all the lights on. Should I replace the battery first?

 

So I disconnected the battery for about 5 minutes and reconnected. All issues went away and it started up. checked battery voltage while running and it is 14.5V. Should I replace the battery??

 

if it's only a year old, i would try recharging it before replacing (ctek automatic charger/maintainer). 14.5 is the inverter, not the battery. you need a voltmeter, and test it at the jump point under the hood, after it has been off for 8 hours.

 

hope this works out, please keep us posted!

 

Replacing the 12 volt battery probably wasn't a bad idea just as an act of maintenance.
But I'm guessing it was never the problem and when the 12 volt was disconnected and then reconnected in replacement it just temporarily reset the codes, that were manifesting because of the real problem.

I don't know who "The Mechanic" is...
But reading the codes the first time would of saved some time.

Hope the issue is resolved.

 

I don't know how old the 12v battery is. I just replaced it. no issues so far.

 

I will see if the issue reappears, but my 12 battery voltage was low so I replaced it anyway. We shall See. It would be nice if the Screen would show some of the issues instead of requiring a code reader.

 

sorry to hear it it's hard enough finding a decent non dealer hybrid tech, never mind a mobile one.

 

Sorry to hear of the problems, but thank you for sharing as a waring to others.

p1121 is usually the 3-way coolant flow control valve.
Although some scanners (like torque pro) have is incorrectly crossreferenced/labled as accelerator position in the error description.

For under $75 you could have your own diagnostic code reader than also shows Hybrid battery and other data.
May be helpful for owners of an older prius
- Elm 327 Bluetooth OBDII adaptor ($20-$40)
- Torque Pro app (~$6)
Download on an android/phone tablet. Connect via bluetooth.


Please report back what your dealer finds.