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Diagnostic Trouble Codes P0K92 and P0K7K

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Montex, Jul 6, 2014.

  1. Michael K

    Michael K Junior Member

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    I just finished replacing my transaxle. I had the same p0a7a and p0a92 codes. It took about 8 hours to do with the help of my dad and a friend. It is probably the easiest transmission change I have ever performed in my life, no bolts were inaccessible and no sheet metal was in the way of dropping or raising it back into place. Good Luck!!
     
  2. Montex

    Montex Junior Member

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    @ Michael: Thanks for the information, Michael. Good to know that you found the removal/replacement to be a straightforward job. Did you replace your transaxle with a new one, good used one, or just replace/repair the MG1 stator, etc?
     
  3. Michael K

    Michael K Junior Member

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    I replaced it with a good used one. I couldn't afford new and according to several places, rebuilding them is a task that required lots of very expensive tools.
     
  4. AliPat

    AliPat Junior Member

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    Hi.
    This sounds so similar to what happened to me on 7/4/14. My transmission had failed on my 2005!!! I bought a warranted used one on ebay & my son, the ASE mechanic, found a pictorial on replacement and put the used one in. The car battery charged right up and it runs fine, now. Be warned that few people will put in a used part, but ask around and you may find a mechanic who will. The dealer will quote you about $5500. for this job. I did mine for $410: $350 for the trans (free s& h with 6 month warranty) and $67 for fluids. Of course I paid my son for his time, too. I saved aobut $4K.
    Oh, and the engine does not have to come out. You may read about this. He also did this using heavy duty jacks, no lift. Good luck!!!!
     
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  5. Montex

    Montex Junior Member

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    I located a good, used transaxle from a 2007 Prius with 70k miles on it. The transaxle came with a 6-month warranty for $650 (plus $75 core charge). The labor for the removal/replacement of the transaxle was less at my local Toyota dealership than what the local independent shops were charging. The final labor bill was $1,1000, which included 1 gal. of Toyota LL red coolant, and 4 qts. of Toyota WS ATF fluid.
     
  6. Montex

    Montex Junior Member

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    I found a good used transaxle from a 2007 Prius with 70k miles on it. The transaxle was $650 (plus $75 core). The labor was less at my local Toyota dealership. So, after labor and fluids, the bill was $1,100 + $650 = $1,750

    The car appears to run good now. I had dark WS fluid, it smelled (!) bad, and there were metal particles on the drain plug.
     
  7. uart

    uart Senior Member

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    Hi Monex. Just wondering how many miles you had on the car when it failed and if the transaxle fluid had ever been changed. As far as I know Toyota doesn't have any service schedule for replacing the fluid, but many here recommend draining and refilling about every 60k miles.
     
  8. Montex

    Montex Junior Member

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    My car has 187k miles on it. The transaxle fluid had *never* been changed. The tech at my Toyota dealer recommended the WS fluid be changed at 90k miles. He could not tell me exactly what had failed within the transaxle, only that it was bad. He said that they cannot get new discreet transaxle components, and that Toyota recommends replacing the transaxle as an entire unit.

    I used an ohmmeter set to the 200 ohm scale to check the old transaxle's two MG windings. I was looking for shorts. I did not discover anything shorted to ground, and each winding measured the same resistance (0.8 ohms on each winding as I recall).

    My transaxle fluid smelled bad when it was drained, so it obviously needed to be changed. I cannot say if the old WS fluid directly caused the main failure of the transaxle. There seems to be two camps regarding this subject. However, in retrospect, I would recommend that the transaxle fluid be changed (at either 60k miles or at 90k miles). Had I changed mine, I may not have experienced the failure.
     
  9. exstudent

    exstudent Senior Member

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    I remember when my transaxle was beginning to give a hint of going out (99,100miles, at 3yrs&2mos old). Fortunately, a dealer was able to get it covered under CARB warranty. After the repair, I was curious as to what the Toyota service and parts department had to say about transaxle drain/fill maintenance, as PriusChat, Luscious Garage, and Art's Automotive, were all adamant about drain/fill at a regular interval of some kind.

    Dealer responses were all over the place. Some service and parts departments agreed to the maintenance, and others said not needed b/c LIFETIME fluid. Other service and parts department contradicted each other: Service-Yes, Parts-No, and visa-versa. Crazy. You would think all dealers would offer and encourage this, to generate more money. But this might open Toyota to liability?

    I agree with the person who wrote the excellent conspiracy theory somewhere here, as to why Toyota doesn't list drain/fill maintenance on the transaxle: to shorten the lifespan on the car, so people buy another car (preferably another New Toyota), sooner rather than later.