Please help: Acceleration issue, Red triangle, Engine light

Error codes should be present; if those lamps were on for two days; unless someone erased them. That should also show up on the dealership Techstream diagnostic tool - time and date of last reset/erasure. I'm no expert, but it sounds like a loose connection and/or poor ground connection someplace. If the dealership has the cars' complete maintenance history; they can start checking the contact points of the previous work done on the car. Also check the traction battery pack safety cut-off switch. There's been incidences where it wasn't reinstalled properly and broke contact when you hit a bump on the road. Hopefully the dealership will stand behind the cars they sell; because the previous incident clearly wasn't properly resolved. I can already hear the dealership "mouth-piece" saying "you bought a used car, we can't warranty it forever".....

Good Luck; Hope this helps

 

Next time you're in a situation like that, try to get the roadside service person to give you the actual, five-character, code(s), not just the English-language fortune cookie. Nobody at the dealership really wants to search through the repair manual to find a trouble code backwards from the fortune cookie, and especially not from a fortune cookie that came from some other tool and might be worded a little differently.

 

Yes, the car does track elapsed time and miles driven since a code clear. (The car doesn't actually record the date of the clear, as the ECUs don't give you any way to tell them what day it is. But a scan tool might read the elapsed time from the car, and subtract it from the scan tool's idea of the current date, and show you the result, as being the date the clear was done. That could be bogus if the date on the scan tool isn't set right.)

Nobody's scan tool should just clear any codes willy-nilly just in showing them.

Sometimes the human using the scan tool just can't resist pushing that button, though, even when they oughtta know better, and even when you're watching like a hawk. "I'll just help you out here and clear this—" "step away from the car!"

 

Did you end up finding an issue? I'm having the exact same error right now.

 

Do you have an error code to share? It seems like the OP in this thread was never given the actual error code, just somebody's version of a fortune-cookie paraphrase for it.

 

The HV battery ecu ("energy monitor") keeps track of the high voltage battery pack. Battery block voltages, temperatures, amperage- it measures all that and shares it with other ecu's - mainly the Hybrid Control ecu. It also controls the battery fan.

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It might even be better to start a new thread. Given that all we really know in this thread is that the original poster had some problem with that car (and wasn't given a code), and you're having some problem with your car (and haven't got a code yet) , there's no way to say if it's "the exact same error" or even closely related. A new thread specific to your situation and your trouble codes might help keep things focused.

 

"keep things focused?"
Bwa-ha-ha. You make good joke.

You know that 2 or 5 or 10 years from now, someone will revive this thread "Hey, did you ever find the cause, 'because I have the EXACT same problem!"
Ah, the power of a google search.

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No error codes yet, but I will ask them specifically about that and update as well! All the “symptoms” are the exact same though, randomly started having slowed/lagging acceleration and the same symbols lit up my dash (triangle of death, check engine, VSC, and little exclamation point). Mostly I’m just a grumpy and broke grad student and I am NOT in the mood to drop 1k+ on whatever this issue is. Please Prius gods, do not let it be the battery, Amen.

 

If you wanted to be able to get codes yourself, this thread shows several options for smartphone apps and devices- some are under $100.

https://priuschat.com/index.php?posts/3290690

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It was my hybrid battery It's a 2008 so makes sense.