Code P2601 Confusing Situation - Coolant Storage Tank

Discussion in 'Gen 2 Prius Main Forum' started by SaLKar, May 19, 2026 at 9:36 PM.

  1. SaLKar

    SaLKar Junior Member

    Joined:
    Aug 12, 2017
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    Location:
    Houston
    Vehicle:
    2010 Prius
    Model:
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    Hello guys. Here's one for all the electrical savvy ones.

    Got the code p2601.

    Here's what I've done so far.
    Tested the pump directly with a 12-volt battery. The pump works but when plugged in it does not.

    Jumped the pump relay in the engine bay directly to see if the pump would work. I've done it before and I jumped the correct pins but nothing happened.

    Seems like the power is not coming to the relay.

    What could be my next steps to troubleshoot this?

    The wiring seems okay under the wheel well near the pump. How do I test from here on?

    Thanks in advance
     
  2. Tombukt2

    Tombukt2 Senior Member

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    Nov 29, 2020
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    Location:
    Durham NC
    Vehicle:
    2009 Prius
    Model:
    Base
    Do you know when the pump is supposed to work and when it's not ? It do not just be on all time after certain temps or any of that . you could wire in a test led to the pump and sit it in between the hood n fender close hood and drive . Once heated up come back to driveway shut off car . During all the shut down noises do the led lite up . For a few seconds to fill the silver tank .? Pay attention . That's it . Now won't run again until car cools enough to need a boost to quickly heat car up . Like tomorrow. unless you in the low 50 or better !