Charging Issues - System Malfunction

A few question will undoubtedly be asked by myself and others, each will probably have different goals in mind when asked, so do your best to answer what you can.,
How did you get the dtc code P3203 ?

If you Gen 3 2012 Prius Plug-in UK model is waiting until the traction battery fans stop, and now is waiting several hours after being plugged in to start charging, my first thought is that the traction battery temps are getting higher than normal.
One way of checking that is using the DrPrius app Dr. Prius App with an ODB2 bluetooth adapter.

By the way, some of your terminology is somewhat confusing to US readers, especially if only read once or skimmed through, since the US standard is 120 volts at most home outlets and 220 volts uses different plug and socket combinations.
So more info about which EVSE you are using and at which switch setting ( 120 volt or 220 volt ) you use most of the time, and if the cars behavior is different when using your two different EVSEs
or when switching voltage settings on the switchable EVSE.

Mostly, does exactly the same behavior happen when your switchable EVSE is set at the 120 volt switch than plugged into the car.

 

I can finally see the pics you attached to your OP,
so when you took the second pic you were charging at Type 1 120 volts, yes?
I remember with my 2014 Plug-in that Type 2 220 volt charging took about 2 hours to fully charge the battery form 0% EV / State Of Charge to 100% SOC.
DrPrius is a great app for Toyota hybrid battery stats, I also use the Car Scanner app for the engine related info. Car Scanner ELM OBD2 – The best car OBD2 diagnostic solution for iOS and Android in your pocket!

Screenshots of DrPrius are all over this forum. If you have a question about what you are looking at with the app, a screenshot always helps along with a description how you were driving ( edit: charging or waiting to charge ) the car when you took the pic. plus anything else you think of to add.

I'd check the hybrid battery cooling air inlet and fans to see if they need cleaning, while you wait for the OBD2 adapter to arrive.

I'm also not finding anything related to the 2012 Plugin with a Diagnostic Trouble Code / DTC P3203. I see one here at priuschat related to a 2007 Prius, but I think that might be misleading after reading it and some of the other links for different model Toyota cars.

 

If your issue really is about the traction batteries temp being to high to start charging when you plug in, one thing you can try to help get an idea or two, after charge has finished to 100% SOC, let the car sit for at least a few hours or overnight. Than, take the car out for a short drive, using about 10% of the battery or about 90% SOC. Than plug in and see if the charge starts when plugged in.

Also, if you haven't checked already, just in case, double check that somehow a charging schedule hasn't been programmed into the charge settings.

 

So, you went 5 miles in HV, DrPrius shows SOC at 22% , you say battery temps look OK to you.

Just sayin, when you plugged in and got the dtc - what SOC / EV miles - was the car showing?

Do you get the same dtc when you plugin with 90% SOC / 10 EV mile of range?

Your 2012 PiP still showing 13 EV miles of range?

 

Sorry I didn't catch these sooner......

These pics didn't show up until you made your second post in this thread and your post count was than 5 posts.
This pic of your MID message is saying there is an issue with the charging system.
What that issue is I still don't have a clue yet. I can't find anything related to your 2012 Plug-in with a P3203 code. But at least I'm now focused on the charging system error.

Two things I've noticed. DrPrius is still not working in your 2012 Plugin correctly, I believe. My first clue was the voltage and state of charge don't raise and fall together like they should. The graphs are not showing the right cell / module count either. Your car has 4 banks of lithium cells ( maybe 22 cells per bank but I don't have the exact number of cells per bank ).
Did the adapter you mentioned you were going to get arrive yet?

Don't worry that your posts might be long, I can only imagine how frustrating it must be for you to try to figure out what is wrong with the data you are seeing.

With my understanding of DrPrius screens, it looks all wrong to me. Which begs the question, is the dtc P3202 the right error code and if it is what does it point to in the charging system.

Here is a random DrPrius screenshot from my 2017 prime which has a very similar battery configuration to the 2012 plug-in , so you can see what the screens are supposed to look like.
charged to 100 % -
discharge to 0% -

 

Looking through the 2013 Plug-in owners manual pdf file
https://attachments.priuschat.com/attachment-files/2015/08/80039_MY13_Prius_Plug_in_QRG.pdf

gave me two ideas you might want to try.

After plugging in get in the car and turn it on ( Press the ON button twice with your foot off the brake ) and if you see anything on the MID indicating why it's not charging, please take a pic and post it.

Another thing you can try is to plug in, unplug, than plug in again. - In the Gen 4 this overrides the scheduled charge time ( if scheduling has been programmed in ) and starts charging immediately. - rinse and repeat to see if you can get charging to start sooner than the 5 hour wait ( as posted above ).

 

Looks like we got lucky with the 3 plugin and replugin dance starting the car charging. Yes, I heard the sound, but it's hard for me to put it in context of where the sound might be coming from just looking at the back of the battery. Do you think that sound is maybe coming from the front of the battery just behind the rear seat, or maybe from under the rear seat cushion, both on the (uk) driver side? If that sound is not coming from either of those locations getting as close to where you think it might be could be helpful.

Can the DrPrius app clear the code it's showing? If it can clear the colde, does the code come back?
I'm also concerned aboujt the 1st message on the MID in the video, the one before the charging has stopped message. Tnat message along with the sound you are concerned about is the reason I'd like to get an idea of where that sound is coming from.

I checked some DrPrius videos and now see that your DrPrius screenshots are good and show the way DrPrius is meant to show the graphs for the Gen 3 Prius Plugin.