Engine sounds rough and loud while accelerating

Your HV battery maybe going bad and the ICE is working harder to compensate for a weak battery.

Have you tried the Dr. Prius app to look at the HVbattery?

Posted via the PriusChat mobile app.

 

You can get a good idea of the health of your HV battery when you put it under stress, high charging and discharging current. Use the Dr. Pruis app while driving under hard acceleration (discharging) and regenerative braking (charging) and watch the voltage difference readings. The higher the voltage difference value is, the more unhealthy your battery is. Look at the "demo mode" in the app and you see what I am talking about.

If you already paid for the license, I would run the life expectancy test. If you have not paid for for the license, I would not pay for it unless you are very interested in the result of the test. You can get a good idea of the health of you battery without running the test by watching the voltage difference value as described above.

Posted via the PriusChat mobile app.

 

Better start saving up some money for some HV battery work. In all seriousness though...

Good god dude! Those are the highest battery temps i think ive ever seen, especially in the winter. Quit driving that poor car for an afternoon and clean the battery fan and recheck those temps. The cells are just being overheated from what i can see so far. Good temp range for the battery will usually be around cabin temp after you drive around for a couple hours and the cabin temp equalizes better.

Yeah they are equally overheated and the mid cell temp gap is around what it usually is. I bet your battery is fine but check that fan asap.

 

yup possible. As they die internally the connection lessons and the available charge lessons. so as the car tries to use them and charge them most of the energy turns into heat instead of going to the battery as charge. If you have cleaned it and it's still that high in the winter it's best to take the battery apart and test the cells individually.

 

At 300k miles. You’ll need additives to make it easier for your engine. Try this additives from BG. https://a.co/d/3nLpzlJ

 

Those temps are fine and will show in red when its too hot and you will hear the fan on high trying to cool it down.

Just keep driving it until you get another code to show you which modules are bad.

No need to take it all apart yet and spend money when you do not need to.

I second some aditives like fuel cleaners

The engine will run longer than normal to keep the engine temp as needed in the winter.