2019 Prius hybrid system failure alarm/fail

2019 w/3500 miles. about 6 weeks ago i faced a 'hybrid system fail contact dealer' alarm. I did. took it in they said something about a cold battery. I went back home (180miles). did it again a couple weeks later only this time said 'to find safe spot and pull over'. did that. shut it down. started up with eco monitor screen up which showed batt being charged by gas engine. drove towards home. failed again about 15 miles from home. 24 hr svc not much help but that's another story. cycled system off then on periodically finally showed charging again. went home. parked it until dealer opened a couple days later. when started that morning system initialized, gas engine started but no current to battery. engine shut down. did that multiple times. dealer came and got vehicle and since that time the vehicle has not repeated failure (2 weeks now). dealer says there were no codes stored in ecu therefore they cannot do much until they get a code to track. what? no codes. I had 3 different circumstances with slightly different failure alarms all related to hybrid system fail. some showing eco monitor charge fail some not. anybody out there got a clue for me. dealer is trying but.....

 

Sorry first filed this in wrong category: 2019 w/3500 miles. about 6 weeks ago i faced a 'hybrid system fail contact dealer' alarm. I did. took it in they said something about a cold battery. I went back home (180miles). did it again a couple weeks later only this time said 'to find safe spot and pull over'. did that. shut it down. started up with eco monitor screen up which showed batt being charged by gas engine. drove towards home. failed again about 15 miles from home. 24 hr svc not much help but that's another story. cycled system off then on periodically finally showed charging again. went home. parked it until dealer opened a couple days later. when started that morning system initialized, gas engine started but no current to battery. engine shut down. did that multiple times. dealer came and got vehicle and since that time the vehicle has not repeated failure (2 weeks now). dealer says there were no codes stored in ecu therefore they cannot do much until they get a code to track. what? no codes. I had 3 different circumstances with slightly different failure alarms all related to hybrid system fail. some showing eco monitor charge fail some not. anybody out there got a clue for me. dealer is trying but.....

#1 Den Rand, A moment ago

 

that's a good thought and I was initially believing it was a factor as it seemed related to temp (initially) but after it occurred when car was left in heated garage that kinda lost inertia. subsequently it failed completely and the dealer sent a flatbed 320 miles round trip. of course the failure has not repeated itself since in the hands of the dealer, and it's been subjected to subzero temps. go figure. the last time I left home with it the car stranded me for a couple of hours in the middle of the night at 10 degrees f so it leaves me not wanting the car until they have assured me it is fixed. then the trouble begins with all inherent complications. I do like the idea of a data logger for storing what seems to me should be stored data anyway. it should be their problem but somehow it becomes mine and I only had it about 3 months.... trouble shooters worst night mare: intermittent symptoms....whine whine


#1 Den Rand, A moment ago

 

their lead tech has been driving the car daily home work etc.. it recently failed to sustain power, he had the monitor connected, apparently there weren't any discernible codes. it didn't last long but at least they had a clue. the weather has been in the -20 range and it took over 2 weeks for this failure. at least now they have some information for Toyota engineering. we'll see what they come up with. my thinking at this time is there may be more than one problem. maybe an ECU and a battery issue. but the fact remains there are not any codes being stored in the memory which makes it near impossible to communicate beyond my complaint. two strikes now for the Lemon law. it seems like the old Chinese curse is a bit like Murphy.... may you live in interesting times. hope there'll be some resolution after engineering sees the data or lack. I'll post it when they do.

 

checking back in on the 2019 Prius 'hybrid system failure' issue. first, to the folks don't have a newer version (I assume) there aren't flashing light alarms but there are alarm/warnings written on the right side monitor, these are what I've referred to. back to the dealership, I don't believe they are shining me on. my most frustrating part of this, and I believe the local dealer's too, is apparently the black box syndrome or I call it a corporate 'proprietary attitude' which ties the hands of local tech without codes to help define potential diagnostic solutions; by this I mean the local tech has wiring diagrams interconnecting black box mystery, with wiring only and no signal description for relevance there's little hope for even understanding the code failure source, let alone the demonstrable failure itself. yes, the ECU is a prime consideration but without understanding the signals that initiate ECU actions or reactions, more mystery. what I'm trying to say is this situation merits signal (or chip?) level failure detection. not the bailwick of the garage tech. Toyota engineering is what seems to be on the hook and I'm not really sure their attention has yet been obtained. one last bit, the local techs have isolated some power loss symptoms (again no codes) but at least a start to compare with another vehicle (when they can keep one around...LOL (sob)).
now, I'm waiting to hear back from corp as I've filed the complaint. they are no doubt assembling the information. meantime perhaps engineering will come back from winter vacation, coffee, or whatever...
finally, back in my day as a digital systems troubleshooting tech when the pressure from on high got to be sufficient the solution was to use the 'shotgun' approach: replace black box level equipment until system function assured, as if an intermittent failure can ever be resolved in such a manner. and perhaps ultimately my solution will be another vehicle. we'll see how fair they turn out to be

 

certainly was initially entertained as source. prime symptoms though weren't compatible. last failure I experienced, which resulted in dealer sending flatbed for vehicle, were: initiate start, gas engine starts, energy monitor showing no current transfer to batt, subsequently system shuts down apparent failure to satisfy run conditions. the gas engine showed no sign of falter or rough running, started easily every time only to shut down after running for a bit. I believe it is possibly a combination failure of battery and ECU.