Fuel pump replaced/ now/ pedal sensor

Discussion in 'Gen 3 Prius Technical Discussion' started by davev1pa, Jul 26, 2025 at 2:31 AM.

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  1. davev1pa

    davev1pa Junior Member

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    2010 Prius base . Son was 700 miles away . Died on interstate: hybrid battery needs checked. Towed to dealership. Fuel pump failure. Had it towed to small shop: fuel pump now replaced but now reads a code for accelerator pedal and sensor. Dealership said they only read a code for fuel pump.. order the pedal.The car runs for 30 seconds then dies.Pretty sure the hybrid is going to be too low with all these non regenerative start ups. Thoughts?
     
    #1 davev1pa, Jul 26, 2025 at 2:31 AM
  2. ChapmanF

    ChapmanF Senior Member

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    Make sure the shop tells you the actual five-character trouble code, not just what they think it "means".

    Then look for that code in this post.

    The Prius has both a throttle position sensor and a pedal position sensor, completely different parts in completely different places, and because of the way SAE standardizes trouble codes, all the trouble codes for those two different things have fortune cookies starting with the words "throttle/pedal position sensor/switch".

    If you're not paying real close attention to exactly which code(s) you have, you end up wasting time and money on the wrong part in the wrong place.
     
    #2 ChapmanF, Jul 26, 2025 at 9:41 AM
  3. Eddie25

    Eddie25 Active Member

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    Make sure it has gas, the gas gauge can "get stuck" making it look like it has gas when it doesn't.

    Edit: Actually it's the part of the fuel pump that informs the gas gauge that gets stuck so if they replaced the entire pump then that's not it.
     
    #3 Eddie25, Jul 26, 2025 at 1:01 PM
  4. ChapmanF

    ChapmanF Senior Member

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    The level sender and the pump are both parts of the same assembly you pull out of the tank, but can be replaced separately, so the shop might not have replaced the whole enchilada.

    Don't forget to check the exact "throttle / pedal sensor" trouble code, using the link in #2 above, to be sure whether it is about the throttle sensor or the pedal sensor.

    Don't put off checking that.

    [​IMG]
     

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    #4 ChapmanF, Jul 26, 2025 at 1:21 PM
    Last edited: Jul 26, 2025 at 10:54 PM
  5. davev1pa

    davev1pa Junior Member

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    I appreciate everyone’s input. So now they’ve replaced the fuel pump. Also the accelerator pedal and sensor. Now they say the 12 V battery is without a charge and put it on a slow trickle charger to see if they can get the car to start. They also have no battery in a town of 65,000 and it would require them to order it . They will call if it starts after a charge today. I’m currently looking up new battery possibilities
     
    #5 davev1pa, Jul 30, 2025 at 1:46 PM
  6. ChapmanF

    ChapmanF Senior Member

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    Any word yet on what the trouble code was?

    If they haven't been in the habit of telling you what the trouble codes were up to this point, you might want to advise them of a new rule.
     
    #6 ChapmanF, Jul 30, 2025 at 2:44 PM
  7. davev1pa

    davev1pa Junior Member

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    Well no unfortunately.. they replaced the fuel pump, Then read the code for the accelerator pedal sensor ( gave me a code but I didn’t write it down) the the 12v was super weak so they did a slow trickle charge which read 12.2 v static and the car started and ran for 30 seconds. The 12 v battery is dated 2017 but this shop thinks that it should be able to initiate the start up. He stated that he has no experience with hybrids and up to this point he’s only replacing the codes ie fuel pump, accelerator sensor and pedal. He’s feels that it may need attention from someone well versed in the state of the hybrid battery but that the local Toyota dealer may not be that great either. I’d thought about towing it back over there butt it’s a quandary.
     
    #7 davev1pa, Jul 30, 2025 at 8:11 PM
  8. ChapmanF

    ChapmanF Senior Member

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    It's unfortunate not to have written that down. Has he told you the "code for the accelerator pedal sensor" has gone away now that he changed that? Is the car giving any codes now?

    When somebody says that, and especially when somebody seems to think the codes tell him what to replace, it's very likely he's never learned that the Prius has seventeen different trouble codes whose fortune cookies all start with "Throttle / Pedal Position Sensor", but eight of them are about the throttle sensor (on the engine) and nine are about the pedal sensor (on the pedal). It is very easy to bark up the wrong tree if you don't have the actual trouble code(s) to look up in this post.
     
    #8 ChapmanF, Jul 30, 2025 at 9:49 PM
  9. davev1pa

    davev1pa Junior Member

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    I can appreciate those concerns. But the initial code for the fuel pump was at the Toyota dealership. They told me there were no other codes. Their estimate was 1500. I had it towed to a shop that said they don’t do hybrids but could do the fuel pump for 800. They soon realized following the fuel pump that it ran the code for the accelerator sensor as well. Well it’s still not running. Also the 12v is weak at 12.2 ( imo) The car is 400 miles away I can’t deal directly and it’s a town with no hybrid shop other than the dealership. It’s unfortunate as I’m sure it was here I could delineate and take a lil time to sort thru the nonsense.
     
    #9 davev1pa, Jul 31, 2025 at 2:02 AM
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