Question about 2004 Toyota Prius

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2004 toyota prius hybrid power loss on uphill grades

We are expriencing a pulsating power loss as we drive in uphill grade driving conditions. We have drove these roads many times in the past (years) without any problems. The pulsating comes from us feathering the gas pedal to keep up our speed. It reminds me of when a gas powered cars fuel pump is starting to fail and as you step on the gas it starts to bog down. The battery indicator (bars) during these times, drops to only a few bars. We have no warning indicators that come on during these times and the screen showing the engine and battery output seem to be working. We have owned this car since it was new. This problem just started to happen.

I'm looking for the manual for troubleshooting help, but that has not showed up yet. Thank You,

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  • hswen Jul 20, 2008

    Thank You!


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Since you did not mention that there are any warning lights on at the dash, I must advise you of the following: Prius vehicles are VERY PICKY when it comes to the proper weight of oil. That being said, and if you have the wrong weight oil in it, expect problems. Easy way to check this: Take off the tube going to the throttle body at the front of the engine. Open the throttle plate & look down into the intake...Do you see any oil laying there, in puddles? If so, you def have incorrect oil in the engine. This will NOT det a DTC code, and it WILL give you your condition.

Posted on Sep 11, 2008

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