Heating up of Toyota Prius Wagon third generation

Discussion in 'Gen 3 Prius Technical Discussion' started by Lahmar, May 16, 2025 at 12:10 PM.

  1. Lahmar

    Lahmar New Member

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    Dear Toyota users,

    I have a quick question. My Toyota Prius Wagon, third generation, year 2013, has recently been showing an overheating warning on the dashboard. After a few instances, the check engine light also appears, which causes the car's speed to be limited.

    In reality, the car drives just in gears 1 and 2. Even on the highway, I can't accelerate anymore.

    I took the car to the garage and we checked the fault codes. The error code P0A93 came up, indicating a possible issue with the inverter cooling pump. I ordered and replaced the part, but the problem still persists.

    The coolant has also been replaced.

    I’ve noticed that when the car heats up, there’s no visible coolant circulation in the reservoir.

    Has anyone experienced this issue before? What was the solution in your case?
     
    #1 Lahmar, May 16, 2025 at 12:10 PM
  2. Rmay635703

    Rmay635703 Senior Member

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    That can be one of many problems including most likely a blown head gasket.

    Best get it off the road, diagnosed and fixed or you will definitely be in for an engine
     
    #2 Rmay635703, May 16, 2025 at 6:47 PM
  3. bisco

    bisco cookie crumbler

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    did you replace it with an oem pump from a dealer?

    are there 12 volts at the pump connector?
     
    #3 bisco, May 16, 2025 at 8:41 PM
    Brian1954 likes this.
  4. BiomedO1

    BiomedO1 Senior Member

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    1. You need to make sure the new inverter coolant pump is working properly.
    2. You need to check and make sure your electronic engine coolant pump is also working properly.

    I'm going to assuming you know where each coolant pump is located and which one you replaced and which reservoir you should be checking. Engine overheat is NOT logged in the OBD2 error logs, so if you don't monitor your engine operating temperature - you could be slowly destroying your engine - continuously running it HOT.

    Hope this helps.........
     
    #4 BiomedO1, May 16, 2025 at 9:06 PM
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