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#4752415 - 05/09/18 09:27 PM 2010 Toyota Prius turned off
Gito Offline


Registered: 08/30/09
Posts: 576
Loc: CA
2010 Toyota Prius (HB IV) with 265k miles.

Friends Prius turned off while driving at approximately 70 mph on the freeway in 90 deg weather (Los Angeles).
He was able to coast the car off the freeway exit.

He remembers something popping up on his dash indicating a problem but doesn't remember exactly what light turned on.
The car eventually started again and it was moved a short distance (from the street to the garage)
Apparently the light that had previously turned on did NOT turn on again when the car was moved into the garage.

He left the car to get it checked out.
He later got a call from the owner of the shop and he indicated that one of the water pumps was leaking but did NOT address why the car had turned off on him while driving.
Apparently there are two water pumps (one for the inverter and one for the engine).

Question?
Could a bad water pump cause the Prius to turn off?
My friend is now considering towing the car to the dealer to get a complete diagnostic.
We are thinking that it might be a bad battery cell but these cars are little more complicated for us.

Any advice is greatly appreciated



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#4752430 - 05/09/18 09:44 PM Re: 2010 Toyota Prius turned off [Re: Gito]
PimTac Offline


Registered: 03/04/17
Posts: 3876
Loc: Soviet State of Washington
Iím not familiar with the Prius system but most new cars these days have a survival mode or limp mode that goes into effect if it senses permanent damage might occur. You mentioned a water pump. Perhaps the system shut down to protect the system from overheating ?
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#4752452 - 05/09/18 10:08 PM Re: 2010 Toyota Prius turned off [Re: Gito]
gathermewool Online   content


Registered: 01/09/09
Posts: 5969
Loc: St. Fu
Obvious question: plenty of fuel in the tank? If your friend ignored a warning, might he have also ignored other symptoms that we and the shop need to help trouble-shoot?

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#4752463 - 05/09/18 10:18 PM Re: 2010 Toyota Prius turned off [Re: Gito]
Gito Offline


Registered: 08/30/09
Posts: 576
Loc: CA
Tank was full. He thinks that he read something like "hybrid malfunction" on a dash light

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#4752521 - 05/09/18 11:27 PM Re: 2010 Toyota Prius turned off [Re: Gito]
BrocLuno Offline


Registered: 09/06/15
Posts: 5403
Loc: Kalifornia Kollective
Inverter overheating would do it. Safety mode to prevent a fire ...
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#4752525 - 05/09/18 11:35 PM Re: 2010 Toyota Prius turned off [Re: BrocLuno]
CR94 Offline


Registered: 03/20/16
Posts: 1063
Loc: Western S.C. since 1996
Originally Posted By: BrocLuno
Inverter overheating would do it. ...
Inverter overheating due to failure of the inverter coolant pump would do it---among other possibilities.
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#4752535 - 05/09/18 11:49 PM Re: 2010 Toyota Prius turned off [Re: Gito]
bdcardinal Offline


Registered: 06/03/05
Posts: 10885
Loc: Santa Barbara, CA
It happens on the Escape Hybrids. A wrench light comes in and the vehicle goes into limp mode. Sometimes it is the pump, sometimes it is the fans, sometimes it is the blend door actuator for the traction battery.
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#4752537 - 05/09/18 11:52 PM Re: 2010 Toyota Prius turned off [Re: Gito]
The Critic Offline


Registered: 08/30/04
Posts: 19706
Loc: CA
Need to scan the car before jumping to any conclusions.

This does sound like an inverter failure of some sort. Some (not all) inverter failures are covered by the ZE3 warranty extension campaign, which is 15yrs/unlimited mileage.
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#4752577 - 05/10/18 03:54 AM Re: 2010 Toyota Prius turned off [Re: bdcardinal]
Ducked Offline


Registered: 10/25/12
Posts: 4231
Loc: Taiwan
Originally Posted By: bdcardinal
sometimes it is the blend door actuator for the traction battery.


...sometimes I think I need to learn all this new stuff. Then I think, wait...maybe it'll go away. Or I will.


Edited by Ducked (05/10/18 03:54 AM)

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#4752706 - 05/10/18 08:23 AM Re: 2010 Toyota Prius turned off [Re: Ducked]
oil_film_movies Offline


Registered: 06/13/16
Posts: 2432
Loc: MN
Originally Posted By: Ducked
Originally Posted By: bdcardinal
sometimes it is the blend door actuator for the traction battery.
...sometimes I think I need to learn all this new stuff. Then I think, wait...maybe it'll go away. Or I will.
He's just talking about the servo motor & housing that mixes vent air & AC-cooled air directed to the hybrid's big battery. Almost all cars these days have these "blend door actuators" to mix outside vent air with AC-cooled air for passenger climate control too, so its like that.

But the blend door thing is not what is causing the problem here. Why? ---> Clue: Water pump leaking. Big clue there. That means the power electronics wasn't being cooled enough due to coolant loss, it overheated and shut down to prevent further damage. Another clue: He said it started up and ran after sitting (cooling down) for a while, so, again, that points to overheating due to coolant loss.
Should be codes stored, a log of past events you can read from a scan tool.


Edited by oil_film_movies (05/10/18 08:28 AM)

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#4752943 - 05/10/18 11:52 AM Re: 2010 Toyota Prius turned off [Re: Gito]
Gito Offline


Registered: 08/30/09
Posts: 576
Loc: CA
Mechanic just notified my friend that they saw no leaks but they got code P261B, main water Pump.

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#4752952 - 05/10/18 12:02 PM Re: 2010 Toyota Prius turned off [Re: Gito]
The Critic Offline


Registered: 08/30/04
Posts: 19706
Loc: CA
Hopefully the head gasket survived.
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2011 Toyota Prius - 167k - ServicePro Dexos 0W-20
2007 Honda Accord 2.4 - 126K - Idemitsu 5W-20

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#4752957 - 05/10/18 12:08 PM Re: 2010 Toyota Prius turned off [Re: Gito]
Gito Offline


Registered: 08/30/09
Posts: 576
Loc: CA
We are hoping that code P261B points to something other than head gasket failure

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#4752980 - 05/10/18 12:30 PM Re: 2010 Toyota Prius turned off [Re: Gito]
Gito Offline


Registered: 08/30/09
Posts: 576
Loc: CA
Friend also says that he had mice in his Prius and has a bad feeling that the code might point to that.

Please advise

Should he just take it to the dealer?

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#4752981 - 05/10/18 12:33 PM Re: 2010 Toyota Prius turned off [Re: Gito]
Gito Offline


Registered: 08/30/09
Posts: 576
Loc: CA
Code P261B also points toward bad wiring.

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