2008 Prius will NOT move + Code P0A90 Drive Motor “A” Performance

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by PriuSocal, Apr 21, 2025.

  1. PriuSocal

    PriuSocal Member

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    Thanks @James Analytic for your input. I assume the code may be due to the damaged wire to the motor temp sensor itself as it would cause it to not read properly. I have checked all the plugs that were involved with the trans removal itself and double checked prior to installing the inverter which has most of those plugs running underneath it and all was reconnected as it should.

    Let’s hope repairing this broken plug takes care of some of the codes that are causing that red car with exclamation point.
     
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  2. PriuSocal

    PriuSocal Member

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    Update:

    Went to the junkyard, got another motor temp sensor pigtail, removed the red wire along with the connector and installed it on my existing plug. Appeared to have worked, red car with exclamation point is gone, along with it all the others except the TPMS (may be due to it having a spare tire in the rear) and the C1378 Capacitor Comm Malfunction code. I have not been able to actually drive the car as it needs an alignment after replacing all the front end suspension components. I did however mode it back and front in the driveway and appears well.

    I tried to erase the C1378 code and it will NOT erase, stays as current. Any idea as to what this could be? Prior to the transaxle swap, car did NOT have any codes except for P0A90 and P0335 codes but both are gone now. I wonder if it just needs to be driven or something reset a specific way that this AP200 scanner cannot. ABS light in NOT on.

    Is the this code calling out the Brake Control Power Supply? And, is this unit the black box near the 12v battery which has 1 or 2 connectors going to it?
     
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  3. ChapmanF

    ChapmanF Senior Member

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    Yes and yes.

    Often, that code pops up when someone has done work back there, and the 1 or 2 connectors didn't get reconnected all happy-like.

    Maybe not the explanation every time, but one can hope.
     
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  4. PriuSocal

    PriuSocal Member

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    Thanks for the clarification. And, yes I had to remove this unit in order to remove the battery when I did. I recall plugging it back up but just found this other post here Trouble Codes C1377 and C1378 | PriusChat and he OP mentions the unit needing to be grounded to the body so reinstalled properly I guess. What the OP does not mention in his fix is if the grounding part was the issue causing the code or the replacement of the BCPS unit.

    Will check and report back. Thanks!
     
  5. dolj

    dolj Senior Member

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    If your BCPS is not bolted down, then that would be the first thing I'd do. Grounding is via the connection points.
     
  6. PriuSocal

    PriuSocal Member

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    The BCPS was not plugged in, I inserted the plug and code has gone away. The one I recall moving was the box attached to the positive cable not the BCPS but glad I found it unplugged and it was not an issue with the braking system as I was alarmed it would be the ABS accumulator since I replaced it 2 years ago when I bought the car.

    Car only has the TPMS light on but im almost certain its the spare tire which I should be fixing this weekend. Excited to do the 1st drive after the alignment.