Red triangle, no code, reset, then nothing (2002 Prius)

I've seen lightning do some strange things without a direct strike, such as fuse the control box for my well pump. There could also have been an interaction between the phone and the car. Probably a rare event, but I'd make sure the phone is off if left in the car.

 

The car threw Hybrid Codes and apparently your Elm can't decode them. Too bad you dumped the codes they would have told you exactly what it was unhappy about. On a 2002 start thinking about a new Hybrid Pack.

Cabin temp may have gotten excessive and overheated the hybrid pack maybe? If your car does not have a real good tint job on the hatch window and that hatch package cover is not extended the hybrid pack area takes a real sun beating and can quickly overheat.
heat is the killer on the Hybrid pack. Whether from external or load heat.

You didn't post your area you live so no idea what your weather is like.

On mine to extend Hybrid pack life I extend the roll out package cover and then built a little foil insulator that fits on top of that package cover. I used a foam foil covered cover sheet of poly insulation cut to exact size to the hatch area. The foam come in 4 x 8 sheets at Home Depot used to insulate wall's.

Now the car can sit out in the sun and that hatch floor area stays cool. In fact I have only heard the battery fan come on once in 7 years and that was because it sat in the sun all day on a blazing hot cloudless Florida day pre foam sheet. After I herd that fan come on I realized what was happening and dealt with it.

Good tint job...insulated foam sheet...and always put Heat Shield Sun Shade in the front window. Alot of electronics in the cabin that don't need to get 110 degree's everyday.

Its amazing how many people down here with brand new cars don't even put in a window shade in there car. Car interior gets like 125 degree's down here. Stupid.

 

Oh you have a 2002...sorry thought it was a Gen2 with a hatch. Your already covered as you have no hatch.

Lots of threads of Battery pack replacements here just search but not alot of G1's though. Lots of rebuilders now.

Sounds like you took a lightning ground strike near your home. May have been close to the car and caused your issue. Rare but very possible.
Look around your property and the roof area for damage. Surprised it didn't take out your tv's. Man do I have lightning story's down here.

Please put NYC in your location to the left like mine so we know where you live.

 

You know, I gotta be frank with you primuspaul. The Gen I will sometimes just appear to randomly give you codes. The key here is consistency (ie: is the code consistently coming back) and reliable/stable 12V power. If I get a code on my Gen I, I usually reset it and see if it comes back. Others will caution against this but they usually don't own a Gen I.

My idea as to what happened in your situation is that your car was doing what it was supposed to, to protect the battery. Obviously the sun heated up your car to the point your phone shut itself off to protect the battery. Your car was doing the same. To avoid this in the future, always try to park in the shade (even if you have to walk farther). This is especially important for a Gen I since the batteries are probably frail at this point.

 

Just speculation, might have been your inverter. went through two of those on my 2002 before I gave up on it.