Prius 2001 heat Gauge

2001 Prius. It started few months back where I get all kind of codes and the heat gauge shows up for like 30 seconds then the Triangle and Check Engine shows up. I used to pull over and disconnect the 12V battery but I found later on that the car would keep going fine even with all the Gauges on. I did replace the air filter. The issue almost gone away when the weather got colder. I just had to reset the battery after 40 mile or so.
Now, the overheat light comes on and after few seconds, the car just lose power and wouldn't respond to the gas. I have to disconnect the 12V battery or sometimes I just have to turn the car off for a minuet or two and that might clear the lights for the overheat. The other day I turn the heater on to see if that would cool the car. Inside the car it was hot as hell but when I pulled over and checked the Radiator water, it was as cold. Is it possible it is the transmission that gets hot? The car now as not having enough power even just when I drive it while it is still cold. The only code I get is c1259. unplug the 12V battery and plug it back in is not clearing this code. Any clue what should I do?

 

p3191 / c1253 / c1256/ c1259 / c1213 / p3120 / p0420 / p0325 are the codes I was getting. I think the P0325 was about the transmission. I have my own scanner that gives only codes for all cars. And I have another cable that connect to the computer and that does more I guess. I still take it to the mechanic and have them use their scanner and clear the codes. The only code I was getting toward the last was the p0325. But since I can't drive the car for long distance like I used to, I am not sure if that code would come up now. My questions: If I can borrow ECU from a friend .. which one should I try .. the main one or the break one? If it is really the transmission, what are the singes of it going bad? I used to go 100 mile /h while these codes where showing and go up hills. I have the car over seas so it is hard to find someone know what the hell they are doing when it comes to Hybrid. That is why I am trying to fix it on my own or at least do the diagnostic right.

 

I was told by someone that is not the issue because I just changed this one few months back. I was told there is another coolant pump that controls the water flow in the radiator.. any clue what is the exact name or where is it located so I can ask a mechanic to check it out? No sure how they will check it but I am going to assume they should at least know that part. The car from US but right now I have it in Jordan ... yep close to all the fight and stuff. I have to be sure it is running perfect if I need to escape to the US embassy

 

Thanks Chap. Do you have the direct link to the list of the sub codes please?

 

I did show it to an experience mechanic and he suggested to change the thermostat to start with. That would make the Engine hot since it is a common thing with the prius I guess. It opens sometimes but some other times it get stuck. I hope this will resolve the old issue (the knocking sensor). I will keep you posted.

 

I paid for a mechanic to change the thermostat ... $7 .. not bad.. ha? I love these third word countries .. cheap labor. I drove the car around the area and the temp light didn't come up so far. I have to drive it long distance to see if that knock Sensor code will show up. I will keep you guys posted if anyone is reading this thread.

 

So, the thermostat change didn't help. So the temp gauge turned on and I had my scanner plugged in and didn't give me any errors. I did reset the computer but it did turn the temp light for a second then back here it goes. At one point while driving long distance despite the temp light on, the CHECK Engine, The triangle of death came on. I reset the computer and all went away except the temp light stayed on. I checked the water in the Radiator and it was warm so it is not over heating. I just installed another used ECM or the car computer. We will see what happen when I drive a long distance and keep you guys posted.

 

yes.. that is the temperature light that goes off. I am not sure if I posted that Chap but in this retard country, they don't check for subcode because they have no parts. That is what a hybrid shop told me. For the P3120 to show, I have to drive 30 miles and that is not possible since it is a small city. the thing is, the temperature light goes off every 5 miles or so and when that goes off, the car almost lose power and the only way to drive after that is to reset the battery. So if I try to keep the code P3120 on the dashboard, I will not be able to drive the car to the hybrid mecahnic to tell me the subcode. Does this make sense? So i have to resolve the temperature light first then I have to go back for that P3120 code.