Howdy fellow Prius afficionados! After resolving some pricey braking system issues last month, my old Prius is at it again! Driving home on the interstate, ~75 mph. Without warning, check engine light and Check Hybrid System are displayed on the dash, cruise control disengages. Car is in some sort of limp home mode, because full throttle application does very little. Manage to limp off the interstate, and throttle stops working entirely. I coast to a stop, turn car off and on, and am able to get home on seemingly ICE power alone, all warning lights remain illuminated. Get home and pull the codes referenced above in the title. The internet seems pretty cut and dry on the P261B, slap a new water pump on and call it a day. The other code is a bit weird though, something about the ICE being unable to start? Are these codes common together? Should I just replace the pump and move on with my life? Just curious what thoughts the members of this community may have on the subject. Thanks in advance for your time! Edit: Car has 220k, for what that's worth. Unsure if pump has ever been replaced.
do you have tech stream? P0A0F is a wide range code. there might be a sub code or a troubleshooting tree in the service manual. make sure you have gasoline. i'm reading to start with cleaning the MAF, then throttle bodytoyota-prius-p0a0f-and-p3190-no-throttle-response-solved have you ever cleaned the egr circuit?
I'd replace the pump, and thermostat. Some here advocate replacing preemptively around 150K. Maybe the second code was triggered by the pump too, happening at the same time. Out of my depth though. How about EGR, ever clean that? Info in my signature.
Change the pump out, it is not hard to do yourself. The engine is probably starting to overheat and that is what the failed to start code is for. I would like to know if you had the J0V update to the hybrid system yet? The overheat light rarely comes on and when it does, you will probably miss it but that pump needs to be replaced. Otherwise you will destroy your engine... http://www.RedBullet.net https://ProjectLithium.com/?ref=mG0GE http://www.Pulstar.com http://www.PlugOutPower.com Use code 7373 http://www.hybridpit.com Use code azusa
When there is a water pump code, like P261B, the ECM puts a protective temperature rule in place: if the coolant ever hits 105 ℃, the ECM will shut the engine right down on the spot. (It doesn't do that if there isn't a water pump code.) The behavior is described in the repair manual, and has been experimentally confirmed to match what the manual says. The P0A0F then gets logged by the power management control ECU, which is kind of the orchestra conductor for the car. It doesn't control the engine (that's the ECM's job), but it directs the ECM on starting and stopping the engine and how much engine power is needed. The ECM acts on its own when it does the bad-water-pump 105 ℃ shutdown. All the power management control ECU knows about it is "hey, I said engine please!" and the ECM said "nope." So the power management control ECU logs the P0A0F, "engine failed to start".
