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Yaris Hybrid 2020 TNGA - Hybrid System Malfunction


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Has anyone else come across hybrid system malfunction in the new Toyota Yaris 2020 (mine is Launch Edition)? Last night while I was driving in a light rain in the motorway at 70mph all of the sudden the system alarm went off indicating hybrid system malfunction. Right after that a range of warnings lights and alarms apeared on the screen:

Hybrid system malfunction
Radar system malfunction
Pre-collision system malfunction
ABS break malfunction
Power steering malfunction

and a range of other warnings and lights that I can't remember.

Feeling the feedback from the steering wheel and acceleration pedal, I felt the car is genunely misbehaving and I am not in full controll of the car which was quite scary in that situation. Luckily I was the only person in the motorway at that moment and gently pulled to the side without attempting to break or anything and slowly stopped the car. Switched off the car and switched it back on and many warnings apeared on the screen. Then switch off completely and lock the car, wait for few minutes and switched back on again. The errors cleared themselves but the hybrid warning remained on the screen constantly saying 'Hybrid System Malfunction Visit Your Dealer'.

IMG_20210203_014519.thumb.jpg.3299e9642110938756984cffbeeeaa4a.jpg

I am very surprised with what happened and I didn't expect this from Toyota and never experience such thing with Toyota before.

Searching online, I found few simillar issues reported in other forums for RAV4 but notting for the New Yaris. To me, it felt like the system was reset due to a power drop or something like that and it recovered itself but not completely sure. Just wanted to share my experience with you and see if anyone has seen simillar issue with the New Yaris. The earliest time that I managed to book with my dealer was next Tuesday, I will post the outcome here.

 

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1 hour ago, Satsuki said:

Has anyone else come across hybrid system malfunction in the new Toyota Yaris 2020 (mine is Launch Edition)? Last night while I was driving in a light rain in the motorway at 70mph all of the sudden the system alarm went off indicating hybrid system malfunction. Right after that a range of warnings lights and alarms apeared on the screen:

Hybrid system malfunction
Radar system malfunction
Pre-collision system malfunction
ABS break malfunction
Power steering malfunction

and a range of other warnings and lights that I can't remember.

Feeling the feedback from the steering wheel and acceleration pedal, I felt the car is genunely misbehaving and I am not in full controll of the car which was quite scary in that situation. Luckily I was the only person in the motorway at that moment and gently pulled to the side without attempting to break or anything and slowly stopped the car. Switched off the car and switched it back on and many warnings apeared on the screen. Then switch off completely and lock the car, wait for few minutes and switched back on again. The errors cleared themselves but the hybrid warning remained on the screen constantly saying 'Hybrid System Malfunction Visit Your Dealer'.

IMG_20210203_014519.thumb.jpg.3299e9642110938756984cffbeeeaa4a.jpg

I am very surprised with what happened and I didn't expect this from Toyota and never experience such thing with Toyota before.

Searching online, I found few simillar issues reported in other forums for RAV4 but notting for the New Yaris. To me, it felt like the system was reset due to a power drop or something like that and it recovered itself but not completely sure. Just wanted to share my experience with you and see if anyone has seen simillar issue with the New Yaris. The earliest time that I managed to book with my dealer was next Tuesday, I will post the outcome here.

 

I had a very similar experience about 3 months ago. Came to a stop at traffic lights, pulled away and then the sound and light show started . The Dash cascaded through every alarm dwelling upon each one for about 3-5 seconds. It was naturally concerning but the car was driving fine. I was about 1/2 mile from home and parked it up on my drive. I think I had one warning light on that would not go out. ( As your last photo shows) Contacted my dealer and the car was checked out. They could see the events I described in the diagnostics but there was no recorded fault that would have triggered the alarms. The garage were keen to get hold of the car and send the report off to Toyota. 

The car has been in daily use since that event and it has behaved perfectly. Presently on 2600 miles

Whatever the cause was I believe it was just a one off. But if we don't tell Toyota about it they won't be able to establish a pattern and possible cause. Plus it needs the Toyota diagnostics to interrogate the fault memory and reset the warning sign.

The car is my wife vehicle and she is delighted with it.

Hope this puts your mind at rest.

 

 

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I would have liked to amended my post but there seems to be no edit facility.

After a rethink the car didn't drive fine at the time all the alarms were going off. I remember 2 things, 1st, the steering was behaving like lane departure was inputting to the steering wheel. 2nd was the power steering assist level altered, it went from almost none assisted to normal a few times.

This may be the "misbehaving" characteristic you experienced.

It would seem we both experienced the same fault.

Despite my years of engineering experience and enough certificates to paper a room turning it off and back on did not cure the problem. 😉

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2 hours ago, scar said:

I would have liked to amended my post but there seems to be no edit facility.

After a rethink the car didn't drive fine at the time all the alarms were going off. I remember 2 things, 1st, the steering was behaving like lane departure was inputting to the steering wheel. 2nd was the power steering assist level altered, it went from almost none assisted to normal a few times.

This may be the "misbehaving" characteristic you experienced.

It would seem we both experienced the same fault.

Despite my years of engineering experience and enough certificates to paper a room turning it off and back on did not cure the problem. 😉

Yes, indeed. It looks like we have experienced a similar problem. I strongly believe it was some sort of power distribution issue to the controller unit that lead to the controller failing and going to a fail-safe mode. Driving 10-15 miles to get home after the incident, the hybrid systems were working alright and cycling the Battery without any problem. I think as the warning/failure was serious, it is designed to stay on until being check by the dealer despite it being already self-rectified. My feeling is that the dealer will clear the error and will not do much about it and that would be it.

As the car is pretty much brand new and under warranty, I stoped myself from looking into the problem. 😅 I am not a good mechanical engineer but when it's down to electrical/electronic problems I can interrogate every single electron 🕵️‍♂️ in the circuit boards until I find the guilty one. 😂

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These are similar warnings to what you get when the 12v Battery is low as well sometimes.

Please keep us informed of further developments.

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11 hours ago, scar said:

I would have liked to amended my post but there seems to be no edit facility.

Stephen, I thought that a couple weeks ago and Frostyballs put me right. You can edit after you submitted a post. Look at your post, top right corner, click on the 3 dots, one of the choices is edit.  Just edit your post then press the submit button as normal.

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Sounds like aircraft incident with all of those warning lights and malfunction 😅, without joke now something in connection with power supply of the 12v Battery, poor connection somewhere, loose ground or low voltage can trigger exactly these faults. Diagnostic it’s the first step towards investigating but a quick check of Battery terminals and ground cables in the engine bay might be helpful. Also if you interested you can buy yourself Carista obd 2 reader or similar, hook the car and do diagnostic and see what happens before visit Toyota dealer. I done recently on my car and was surprised how many possibilities gives me a simple diagnostic. 
Regards 

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14 hours ago, Catlover said:

Stephen, I thought that a couple weeks ago and Frostyballs put me right. You can edit after you submitted a post. Look at your post, top right corner, click on the 3 dots, one of the choices is edit.  Just edit your post then press the submit button as normal.

Thanks, my other forum has an “ EDIT” at the foot of the post, it also has a time limit on making alterations. Not so obvious here

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11 hours ago, TonyHSD said:

Sounds like aircraft incident with all of those warning lights and malfunction 😅, without joke now something in connection with power supply of the 12v battery, poor connection somewhere, loose ground or low voltage can trigger exactly these faults. Diagnostic it’s the first step towards investigating but a quick check of battery terminals and ground cables in the engine bay might be helpful. Also if you interested you can buy yourself Carista obd 2 reader or similar, hook the car and do diagnostic and see what happens before visit Toyota dealer. I done recently on my car and was surprised how many possibilities gives me a simple diagnostic. 
Regards 

I might as well get a suitable ob2 reader. We have 2 hybrids so I can see it getting some use.

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11 hours ago, TonyHSD said:

Sounds like aircraft incident with all of those warning lights and malfunction 😅, without joke now something in connection with power supply of the 12v battery, poor connection somewhere, loose ground or low voltage can trigger exactly these faults. Diagnostic it’s the first step towards investigating but a quick check of battery terminals and ground cables in the engine bay might be helpful. Also if you interested you can buy yourself Carista obd 2 reader or similar, hook the car and do diagnostic and see what happens before visit Toyota dealer. I done recently on my car and was surprised how many possibilities gives me a simple diagnostic. 
Regards 

I might as well get a suitable ob2 reader. We have 2 hybrids so I can see it getting some use.

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On 2/4/2021 at 9:06 AM, TonyHSD said:

Sounds like aircraft incident with all of those warning lights and malfunction 😅, without joke now something in connection with power supply of the 12v battery, poor connection somewhere, loose ground or low voltage can trigger exactly these faults. Diagnostic it’s the first step towards investigating but a quick check of battery terminals and ground cables in the engine bay might be helpful. Also if you interested you can buy yourself Carista obd 2 reader or similar, hook the car and do diagnostic and see what happens before visit Toyota dealer. I done recently on my car and was surprised how many possibilities gives me a simple diagnostic. 
Regards 

Yup, it was a complere light and alarm show 😂. Yes, indeed, I suspect some issue with power itself or the connectors/grounding. My plan is to monitor the 12v powerline from few places and record the traces for sometime and see if there is any noise, drop or overshoot on it. Depending on how easy-access it would be, I might do the same with the high voltage Battery as well. I actually do have a couple of cheap OBD-II scanners lying around (not as fancy as Carista though) I just have to find them 🤦‍♂️.

On the bright side, I have switched on the car today and guess what, the error was cleared and there was no error on the panel anymore. I also drived the car for a bit and everything looked alright. Let's see what the dealer says on Tuesday.

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Update...

Visited the local dealer on Tuesday morning and after waiting for a couple of hours or a bit more, they got back to me and told me that they cannot find anything wrong with my car 🤦‍♂️. Aparently they even drove the car for a while to see if anything goes wring with it. So they offered me two solution: 1- I leave the car with them and they give me a courtesy car for a while and they try to see if the car gives an error again. 2- I take the car and if the error appeared again, drive back straight to the dealer and they investigate it at that instance. So I decided to go with the second option and keep the car. As we discussed it's very likely to be some sort of power failure, so I will start searching for it myself and see if I can find anything...

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You picked the better option, the fault may never happen again therefore don’t worry too much and enjoy your new car. 👍🚙

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