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Red triangle, limp mode, P2122, P2138, B2271, C1378

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by DMAndy, Jul 17, 2024 at 6:11 PM.

  1. DMAndy

    DMAndy Junior Member

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    2006 Prius
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    I have had a recurring problem for at least a couple of months now.

    I am driving along merrily, the red triangle pops up randomly, the car goes into limp mode, electric motor working only, top speed of 10 mi/h. If I disconnect the aux battery for a few minutes, the car drives again, but not for very long. The longer I wait, the longer the car will drive before the same thing happens again.

    Thinking about it, this has only happened when I started the car after a few days in the garage, parked for a while, then went on my way again. I have driven 50 miles with no problems without parking. Today, I have driven less than 12 miles, but parked for 2 hours after 6 miles, and had to limp home for the last half mile.

    Does anybody have any ideas? I initially assumed the P2122 and the P2138 codes were because of the limp mode, but maybe not?
     
    #1 DMAndy, Jul 17, 2024 at 6:11 PM
  2. Tombukt2

    Tombukt2 Senior Member

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    2009 Prius
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    Base
    Now this has something to do with your throttle position sensors gas pedal position sensor that sort of thing You need to look those up someone here can give you the work up for those usually it's corroded wires and things like that a plug that's been knocked loose etc there are a couple of sensors that can be involved here someone will post the manual workup probably from the factory at some point.
     
    #2 Tombukt2, Jul 17, 2024 at 6:59 PM
  3. DMAndy

    DMAndy Junior Member

    Joined:
    Aug 28, 2020
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    Location:
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    Vehicle:
    2006 Prius
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    Active
    Thanks. What makes me wonder is that I only get this error when I drive the car, park it and drive it again. Left for a few days and driven in one go, it is fine.
     
    #3 DMAndy, Jul 18, 2024 at 2:24 AM
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