Check Hybrid System, P0A0F / P2111

thanks for the update, glad they got you sorted!

 

Hi Shawn, I have a 2010 prius gen 3. Having the error code of p0a0f and p2111 as well. For p2111, you can fix it by replacing the throttle body. What about p0a0f? This is caused by the fuel pump right? Did you fix it?

Thanks
Kris

 

Trouble code P0A0F is "engine failed to start", and P2111 is "Throttle actuator control system - stuck open". So both of these trouble codes could be caused by a bad throttle body.

I would take off the air filter housing and inspect the throttle body. Is the throttle body valve open or closed with the car off? Is the throttle body dirty? Clean the throttle body, then disconnect the 12v battery for a reset, and then try to start the car.

Come back and tell everyone if this solves the problem or not.

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Thanks a lot. I will give it a try and you posted.

 

No, P0A0F is just a generic code from the power management control ECU (the orchestra conductor for the car).

The P2111 comes from the engine control module, and tells you what the engine issue is.

P0A0F is just the power management control ECU saying "I don't know what the issue is, but I cued the ECM to start the engine and he wouldn't do it, go ask him why."

 

Brian, I did exactly what you said, and watched a few youtube videos and cleaned the throttle body by myself. The car drives a bit differently, I think. The first time start after the job was rough, the whole car shook for a sec. Then it's all good now.

The cleaning process is not as easy as the pros on youtube. I felt like I was damaging the throttle during the process. Luckily the car is working now and no code so far.

Appreciate your help and encouragement again. Also a big thank you to ChapmanF.

 

Hi Brian, seems like the problem came back. I removed the throttle body this morning and cleaned it inside out. But the code is still there. The throttle valve is slightly open and not balance. TBH I have no idea what a normal throttle body valve looks like. Does it mean I have to replace it? Thanks.

 

I would buy a used throttle body and see if that fixes the problem.

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Thanks, just replaced with a new throttle body bought online, cost about 120 Pound. Let's see how long can this last. Is throttle position sensor the MAF sensor BTW?

 

I bought a new one that made in China, seems like the seller sold hundreds of it. Let's see how long it would last. Thanks.

 

No. The throttle position sensor is installed in the throttle body assembly.

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I have tried to search on youtube and ebay, can find onle one used throttle position sensor, is the part number 89451-47060? Where is this sensor in the car? thanks

 

I suspect that eBay seller is just mistaken about what part that is.

I think PNC 89451 would be a shift sensor, which that picture looks a lot more like:



You would have the devil of a time attaching that to your throttle.

 

Thanks ChapmanF. Looks like this sensor is inside of throttle body?

 

Right. Maybe don't get too hung up on the sensor? P2111 only means that the ECM tried to move the throttle to a more-closed position and it didn't go there (according to the sensor). So it could mean the sensor is bad and lying, or it could mean the sensor is just doing its job and telling you what didn't happen. It's good to check all the possibilities: make sure the throttle itself mechanically moves smoothly, the wiring is intact, and so on.