My 2006 Prius 143k mi with original HV battery had the triangle of death yesterday with P0A80, P3000-123 and C1253. Also, block 8 shows about 1.3v lower than the rest of the blocks. I am convinced that one cell in one of the two modules of block 8 burnt and the HV battery needs rebuilding. However, I can not figure out if code C1253 is coming from the bad HV battery or it is something not related. Today, a rebuilder installed a loaner HV battery while mine is repaired and rebalanced and code C1253 did not come back yet. Any ideas?
That P1253 code has 7 sub-codes which could help isolate the area where the problem is. In any case, I would save the diagnostics and then would repair the HV battery, after which I would clear the codes and rescan for any DTCs. Then take it from there.
The code is now cleared so if it happens next time you should read the sub code and other info from freeze frame. That would help a lot in diagnosing C1253. Code could be basically nothing, caused by bad/low 12V battery, pulled relays at a point, or it can also be a bad brake actuator. From freeze frame you should check the sub code(s) and other stuff like voltages and also other stuff like yaw-rate (I think this code sometimes can happen at startup and then it has low voltages and/or high (negative?) yaw-rate).
It's not uncommon for other unrelated codes to pop up. Kinda' like worrying about a hangnail when you're having a heart attack, you've got bigger concerns (the HV battery). GOOD LUCK!
If the value of vehicle is low enough (Prius wouldn't be that cheap here but maybe in US) you might need to take other stuff into consideration before spending money on vehicle. So in that case that analog is not really true.
I saved the file but unfortunately this does not include the freeze data and the sub code for C1253. However, I noticed that there is no check mark under the history column on the health check results. Truth is car was sitting for several days due to school closures and at start up the triangle and lights came on instantly. Yes I agree. I know I have to deal with the HV battery no matter what. This is correct. Value on kbb private sale is $4510 and the HV battery rebuilding $450 including a loaner battery. I do not see a $450 repair for a 14 year old car as not normal. It could be a wheel hub on Honda Civic for example.
Distinctly unlikely. If the code comes back, there will be a bit more looking up that you can do, "Hydro booster motor pump relay" sounds like the fortune cookie for the code. When you look the code up in the manual, there will be a longer passage there, framed in a box, called the "detection condition". The detection condition is a technical description of what exactly happens in the car that the computer is programmed to report with that code. Often, when you look that up, it will be a very useful suggestion about what you need to diagnose. The fortune cookie is more of a lame memory-jog, usually not enough to go by when you're trying to decide what's gone wrong.
Agreed but this is an electric vehicle so the state of health of both batteries comes first. For example, no sense worrying about a wheel bearing issue YET if the car won't move due to a dead HV battery. Let me change my analogy to a broke arm and heart attack. Definitely got to treat the HA first! The arm is important but it can wait. Common sign of a weak HV battery. Your car has gone into cardiac arrest (to stay with the analogy). Look into what type of repair or replacement works for you in your situation. I went with a new Toyota HV battery nearly 3 years ago. It made sense/cents to me at that time. You can get new, aftermarket modules (cells) for around $1600 plus installation. GOOD LUCK!
Mostly just meant that sometimes some car might not even be worth all the fixes that it needs. In that case you would want to find out as much as you can on all the possible faults before starting to fix any of them. So analogs with humans don't work that good. But yes in this case correct way to proceed is just to get the hybrid battery fixed (replaced) first. Then maybe if the other fault happens again then figure that out.
Here is an update. I drove the car with the loaner HV battery for a few days and around 60 miles. It’s not much but we do not drive much with this pandemic. Code C1253 or any other code did not come back. Since C1253 came only once at the same time with the HV battery codes P3000-123 and P0A80 and was not even in the history, I assume for now that the bad HV battery create it. I will keep you posted if it ever comes back.
