C1259 and C1310 still

Codes C1259 and C1310 mean that there is a trouble code reported by the hybrid vehicle control ECU. The scanner that you are using is not capable of communicating with the hybrid vehicle control ECU. You need a better scanner to read all the trouble codes that the car is trying to tell you about. You are just guessing what the problem is until you read the trouble code(s) that are in the hybrid vehicle control ECU.

What are the symptoms the car has?

 

I now see that I responded to the thread you created on January 7th, 2026, https://priuschat.com/index.php?posts/3589443

Do you have any update?

 

Brian thank you for responding to the thread, I see this is a recent one so will add and ask. I got a code reader that was supposed to also read battery information, well it doesn't. After the car (2009 Prius) needed a second jump start from the first about a week ago, the dash lit up with the red triangle exclamation, ABS, VSC, MFD had the exclamation auto. I know there are more codes but what I was able to read was C1259 and C1310. The 12v is about 2years old and is a toyota battery. So I can keep my change in my pocket, any thoughts?

 

A 2-year-old battery could be flat and cause problems if the voltage is pulled down low enough when you try to start the car.

With just about any problem in a modern car, the first step is to check that you have a good 12 V power supply. So you must check the voltage, then fully charge the battery and do a load test to check the capacity. If the battery checks out, then you can move on to the next step.

 

^+1 What dolj wrote. Charge 12v battery and make sure it is good.

If you want a better scanner. I recommend the Autel AP200. It is about $60 on Amazon. Take a look at these two threads, https://priuschat.com/index.php?posts/3248209 and https://priuschat.com/index.php?posts/3290690
Posted via the PriusChat mobile app.

 

Well I've replaced the battery, which at static consistently reading 11.7. With car on, I was getting 13.5, so it was charging but not holding. now I'll research the threads further, and there are a lot, about clearing the lights on the dash and/or how to reset to ensure accurate codes. Local shop wants $180 just to put it on and diagnose (i.e., read codes).

Just read your posts. Thank you, I'll check into the reader. Purchased reader getting overnight. They upgraded the AP200 to the 2500, still at $60.

 

From what I've read, the AP2500 is more of a downgrade. The AP200 is still available if you look a bit wider.

 

good to know, I'll look into it. I see 2500 is only 5 services while the 200 covers 19 services and actually looks more comprehensive. Well I ordered both so will return the one I don't use. Tomorrow the 2500 is in and Sunday for the 200 to arrive. I have 2011 gen 3 also, so this will be very helpful! Looking forward to learning them.