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post #1 of 3 (permalink) Old 04-13-2014, 11:35 PM Thread Starter
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Default 2004 Prius Transmission or Battery problem?!

Wondering if anyone would be able to identify the problem that I am having with my 2004 Prius.

As I was driving earlier today the car suddenly lost power. It still drove down the block but when i pushed on the gas pedal it would not accelerate. I parked the car, turned it off and turned it back on and the car still had trouble accelerating. I drove the car back down the street to my house and as I was pulling into my drive it lost all acceleration.

When I turn the car on now, all of the lights on the dashboard light up, but the engine doesn't seem to turn on. It seems as if its in some sort of emergency shut down, and the car wont move at all.

Would this be a transmission or battery problem? The car has 170k miles and I have never experienced any problems like this before. I'd like to get some input as to what the problem might be before I shell out $300-400 to get it towed to a dealership and have they look at it.

Here is a picture of my dashboard:
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post #2 of 3 (permalink) Old 04-14-2014, 09:26 AM
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It could be a couple of problems. The simplest would be a failed 12v battery. How old is the current battery?

Second could be the failure of the inverter coolant pump, or the inverter itself.

My suggestion is to have the car towed to a Toyota dealer and have them check the codes. Don't try to drive the car as it sounds like it is running only on the traction (HV) battery. You don't want to totally deplete that battery as recharging it takes special equipment that not all Toyota dealers have.

Let us know what codes the dealer pulls.
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post #3 of 3 (permalink) Old 04-15-2014, 12:27 PM
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To check the 12-volt battery, perform the battery test as described at this Web site:

http://www.elearnaid.com/opdsopbadifi.html

Near the bottom of the Web page, instructions appear under the following heading:

"Has your 12 volt battery failed? Prius battery test procedure for 2004 to 2012+ Prius Cars"
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