2007 Prius with C1259 and C1310 - any ideas?

I had the battery replaced in January & it’s still under warranty. The guy who replaced it is dodging me and doesn’t seem to want to come out. He saying that these codes have nothing to do with the battery itself. Is there any validity to this? Has anyone else had any luck with simply replacing the missing nut to the cell terminal, assuming that one was missing?

 

These codes C1259 and C1310 are considered companion codes. they come on when the HB battery is in a low state of charge. This is 99% the reason and not the regen. brakes. It almost always comes on when P3000 comes on. The only reason I can think of them coming on "by themselves" is when the car has sit and the Battery becomes low. They come on for safe driving concerns before the computers have a chance to do their self diagnostics on the HB battery. The HB battery starts to charge when the ICE starts and then it doesn't need to show the P3000 code.

It also means your HB battery will probably be failing very soon.

 

Not exactly.

The poster hasn't come back and clarified what scanner they are using, but it sounds like he is not seeing the codes set by the HV battery ECU. We know this, because the P3000, P1259 and C1310 are codes set by other ECU's because they heard from the HV battery ECU that it had a problem. When the poster can read that ECU, his problem will be much clearer.

But for sure he will need yet another replacement from his "rebuilder"

 

If I remember right, some or all of those three codes are set by other ECUs because they heard from the HV ECU that it is aware of some problem (which might already be something it heard from the battery ECU). (Did you mean to type 'or', as in "HV or battery ECU"?)

In any case, getting the codes read from the HV and the battery ECUs will reveal why those other codes are set.

 

i was wondering why i couldn't remember this thread

 

Yes, let's go with that.

 

Sorry to revive an old thread, but we're having the same code issue. 1310. 2007 Prius with 260,000 miles on it. We are at 2 years and 50,000 miles on a refurbished battery.

The dash indicates that the battery still charges to full, but when driving, power cuts out and then back in.

We pulled the battery fan and cleaned out the vents and made sure the fan was working properly then replaced everything.

The relay checks out as working, also.

At this point, I'm hoping to find someone locally here in Northeast Ohio, Cleveland area, who can go through the battery and see what's up.

Does anyone know of someone in the area here who can do this kind of work?

Feedback and suggestions appreciated!

- Michael

 

Better to get the rest of the trouble codes and go through those; then you'll know what you need to go through to see what's up.

As was covered upthread, C1310 is a code set in the brake ECU that means "hey did you hear the hybrid control ECU has a trouble code for you?". Without knowing the code that's stored in the hybrid control ECU, we don't know what this is about.

If you read the hybrid control code and it's P3000, that's another one of those "hey did you hear" codes that would mean the real code is in the battery ECU. But without knowing what the hybrid control ECU is saying we can't say we know that yet. The hybrid control ECU is able to report many other issues besides those involving the battery.

 

Thanks - perfect explanation of the pat to follow.
I have a USB/Bluetooth OBDII reader - can you point me to a version of Techstream that is appropriate for 2007 Prius? (can be Windows, Android or iOS)

 

I have same codes 516 and 612 in my car 09 done 154k, someone suggested my transaxle needs replacing? I am confused now... In this thread it is leaking cells? I connected my car to TS v.14 all my cells are similar charge and healthy though... May be a nut is the problem? Because previous owner have replaced the HV battery but problem still exists....
I have to clear codes everytime I need to Ready the vehicle.

 

I'm not sure to whom you are directing the "I have the same codes", but (assuming the 516 is a typo and you meant 526) those are sub-codes that go with the DTC P0AA6.

You are right to be confused because "someone" is misleading you. The above DTC could mean a problem with the transaxle IF the sub-code attached to it was 526/613. The combination you have (526/612) indicates the problem is in the hybrid vehicle (HV) battery, specifically a high voltage leak to ground. This electrical high voltage leak could be caused by a physical leak of electrolyte from one or more modules creating an electrical path between a module terminal to the battery case.

It would seem so and is in keeping with your reported symptom:

 

Thanks for the reply, I used to get code P0AA6-526 and 613 but now I only get P0AA6-526.
I don't feel anything wrong with the gearbox, no strange sound at all, car drives so smooth.

 

Ok I run the check again now and I got the codes 526 and 613.
I think I will have to check the battery before anything else.

 

So is it a 526/612 or a 526/613.

If it's a 526/613 and you're going to work on the battery, that's like dropping a quarter on the floor in the bedroom and then walking to the kitchen to look for it because the lighting is better there.

 

The fault can be in battery pack or transaxle as the manual suggests, and other areas too.

Yes definitely 526/613, I looked at my old scan photo and today's scan, and sometimes I only get 526 without 613.

Thanks for the reply

 

If the codes are cleared, 526 is the one that will come back first. 526 is the code the car sets when it notices there is some electrical leakage somewhere. It functions as a "note to self: on next start figure out where that leakage is." So then if you avoid clearing the P0AA6, then on a subsequent start the computer will have figured out where the leak is, and you will then have both 526 and the specific code for the area with the leak.

 

Yes I agree with you but according to the manual it is suggesting too many areas.... So the easiest part is to open the battery pack and check for any leakage by naked eyes. At least you can see something, or lose/missing nuts ...etc because the battery was replaced by previous owner, also the inverter assembly was replaced...

 

I'm sorry, what? Did you say you are getting 613?

It might be possible to feel that 613 suggests "too many areas", but it's hard not to notice that none of them are in the battery pack.



If you have a 613 and you are looking in the battery (because it's "easiest" or for any other reason), then you are looking for a quarter that was dropped in a different room, just as dolj put it in #34.

 

Ok thanks for the info, i think I will need to check the resistance in MG1 and MG2 connectors, that should exactly where the problem is. Just the pain of removing the invertor assembly on top of it.
Thanks again

 

I am pretty sure the MG1 and MG2 connectors will be accessible without removing the inverter. (You would disconnect them to remove the inverter.)

Stay safe. Do you have a megger? Have you read A Stitch in Time?