Battery problem?

Hey there......
i have a problem and wondering whether any body could figure it out. My prius would not start. I took it to toyota and they checked the battery and said it was ok. They did a drain test and said there was no drainage. They returned the car and said every thing was fine. The next day the car would not start. I jump started it. What do you think is the problem. Any suggestions would be highly appreciated

 

The way it should work is: press the brake pedal and the power button lights up green indicating there is a good connection between the car and the fob. An orange LED when pressing the brake pedal indicates something wrong with the power-on communication between the car and the fob. One thing you could try is place the fob over the orange LED and see if it goes green. This is the backup procedure to make the car ready to start. A bad communication between the car and the fob could be either a low battery in the fob, or a low 12 Volt battery in the car. Beyond that, it could be a damaged fob or damaged antenna in the car. I guess it could also be a bad brake pedal switch--you could check to see if your brake lights illuminate when you press the brake pedal.

 

11.5 is too low. 14.34v means it's getting a charge, but not taking it. You need a battery.
That's your first step. Which will probably resolve the low traction battery light.

 

You should believe what the car is trying to tell you.......to a point.

Likely that your HV/traction/hybrid battery is getting weak.
You should take it to a qualified shop (probably Toyota) for a test.

It is also possible that the 12 V battery is low......as that sometimes causes false failure indications on other things.

The problem has NOT fixed itself. It will be back. And the next time it might not start at all.

 

First, it is not nice to inject your different problem into someone elses thread. It just causes confusion.

Then, it is likely that your 12 V battery is going bad. Sometimes even the best shops have trouble testing to find that out.

 

If you get an OBDII bluetooth enabled dongle (to plug into the diagnostic port under your dash), you can use apps to test the health of your hybrid battery. I use the Dr. Prius App which shows the charge of each module and does a battery stress test to estimate the charge capacity of the battery overall. It does cost something like $8.95 to use on one vehicle, can then do repeated tests as needed. On my 2010 with 96,000 miles, the test showed 83% capacity which is quite good.

Info on the Dr. Prius App with recommendation on which OBDII dongle to buy: Hybrid battery diagnostic and repair tool for Toyota and Lexus

How old is your 12v battery and how many miles on your 2010 Prius?

 

Mine had same issue and today it stalled and now can't start the engine what should I do ?

 

replace the 12v. then put a reader on it for codes

 

I believe the lowest is 12.4. It's a fussy battery. How old is it?
You can do a search here to find better info on the 12v Battery.
But if it's 11.x, it is too low.

 

Have it towed to a qualified Toyota shop.

 

In general, if it is just sitting there and you are SURE that nothing is powered up.......below 12.3 is suspect, below 12.0 is bad.....but it first needs a good charge and a load test. If it is over 4 years old, just replace it.

 

hometown hybrids has an excellent reputation here

 

they are hit or miss. some have had decent luck, others not. talk to matt at hometown, he'll give you the truth on rebuilt batteries

 

@Dawst I had similar issues starting when my 12v died a couple of years ago, so I'd wager that's the issue. Once I got it in READY mode it worked fine though.