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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I'm not aware of any such problems, and puzzled as to why you suspect the transaxle but one thing is certain: you have a very technologically advanced car with many highly interconnected systems controlled by complicated firmware/software. It has many benefits, but one of the trade-offs is that you're effectively tied to visiting Toyota dealers when things go wrong and the vehicle absolutely MUST be maintained according to manufacturer specifications.

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In short, get your car to Toyota asap and find out exactly what's wrong. You can then decide what to do next.

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I briefly disconnected y battery yesterday and

some other garages can diagnose this problem m8 but its not wise as there not used to the system there gonna charge about 70pound to look at it, how old is the car? it might still be under warrenty, it should not have done to much damage though.

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