I have a 2017 Prius V with about 208K miles. My check engine light came on and I checked it with the an app on my phone connected to the dongle plugged into the car. It appears to be related to a possible water pump issue according to the code. It has gone off and on by itself several times over the last few days. Today it not only came on but the yellow triangle warning light came on with a message about the hybrid system. I pulled over immediately because it seemed to have less than normal power (I was going 65 when this happened). I tried to run the app again but no new codes showed. I turned the car off for a minute and turned it back on and it was drivable with full power. I hit the clear code command and both the check engine and yellow triangle disappeared. I cautiously drove the rest of the way home without incident or warnings. I even stopped on the way turning the car off and back on again but no warnings. I hate to pay a dealer to check anything. Could it all be related to the water pump not spinning as expected? Any suggestions? Thanks
I'll assume there's a typo in your title and you meant the code P261B for insufficient RPM of the engine water pump. That lights the check-engine light. (For a short time, you may be able to edit the title here to fix the typo, and other people doing searches won't miss your thread. If that button has gone away already, you can use the Report button and ask the mod to fix it.) If the engine coolant temperature reaches 105℃ while there is a water pump trouble code, the ECM shuts the engine right off. It doesn't even take the time to explain this to the power management control ECU, so the power management control ECU sets its own code P0A0F (meaning, roughly, "uhh, engine? is there a problem?") and lights the triangle. Then you have only whatever short distance of electric motor power is available from the battery.
Thank you much. Yes it is a typo and I'll try to get it fixed. That's what I was afraid of. Oh well, new water pumps aren't that bad. I better use another car today while I make some calls.
Brian, Thanks again for responding. Are there any good videos that you know if about replacing it? KP
My prius has code P261b engine coolant pump b control malfunction. I changed water pump and thermostat cleared the code and still the same thing any help. 2014 prius 4
