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Error P085D, need your help

Discussion in 'Gen 3 Prius Technical Discussion' started by worrachai, Nov 2, 2020.

  1. worrachai

    worrachai Junior Member

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    My prius3 had DTC code P085D. But I don't know where can I check connector. Please advise.
     
    #1 worrachai, Nov 2, 2020
  2. davecook89t

    davecook89t Senior Member

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    What type of code reader are you using?
     
    #2 davecook89t, Nov 2, 2020
  3. PriusCamper

    PriusCamper Senior Member

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    Assuming you're using a code reader that's specific to Toyota hybrid systems this points to a problem with your gear shifter. Has it been accidentally bumped into or kicked? You may have to take apart the dash to inspect the plug, or you could try swapping it out with a spare one from a wrecking yard. If they allow you to pull your own parts it's an opportunity to practice taking apart the dash so you're less likely to damage your own.
     
    #3 PriusCamper, Nov 2, 2020
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  4. worrachai

    worrachai Junior Member

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    -P085D has been came up by techstream V13.0.xx
     
    #4 worrachai, Nov 2, 2020
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  5. worrachai

    worrachai Junior Member

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    Where is location of Gear Shift Control Module "A"? And someone ask to Gear Shift Control Module "B" too. Please advise.
     
    #5 worrachai, Nov 2, 2020
  6. PriusCamper

    PriusCamper Senior Member

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    Not sure where the second one is but the primary one if directly behind the gear shift nob...
     
    #6 PriusCamper, Nov 2, 2020
  7. Elektroingenieur

    Elektroingenieur Senior Member

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    This is one of many situations in which the one-line description (“fortune cookie,” to use @ChapmanF's apt term) shown in the Techstream software and in the Repair Manual can be misleading.

    Toyota had to follow the SAE J2012 standard when assigning DTCs, and for many conditions, they chose the closest standardized DTC, even if the description in the standard (for DTC P085D, “Gear Shift Control Module ‘A’ Performance”) didn’t follow Toyota’s terminology.

    As the Repair Manual (more info) procedure for DTC P085D explains, this problem doesn’t have much to do with the shift lever used by the driver. Instead, it relates to communication between the power management control ECU and the transmission control ECU assembly, which manages the parking lock mechanism in the transaxle.
    The Repair Manual procedure describes how to check the wiring between terminals A22-22 and A24-22 (PCON, light green wire), and between terminals A22-28 and A24-23 (PPOS, white wire). Both of these connectors are in the instrument panel, behind the glove compartment. If the wiring is OK, the procedure also explains how to check the PCON and PPOS signals using an oscilloscope, to decide which ECU to replace.
     
    #7 Elektroingenieur, Nov 2, 2020
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  8. worrachai

    worrachai Junior Member

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    After I checked overview for my car history, I got requested new 12v Battery from last service by Toyota service center.
    So, yesterday I was replaced 12v Battery. After changed, all electrnics look brighter lamp, easier steering wheel, better performance engine and no any error code happen.

    Let me monitor 2 - 3 weeks. will be inform the result again.
     
    #8 worrachai, Nov 5, 2020
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  9. worrachai

    worrachai Junior Member

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    This problem is not solve yet. last 2 days ago, I drive the car normally and stop for fill the fuel. P switch cannot lock for Parking and show on display for P multifaction( in attachment).
    Then, I stop the car and I shutoff the power switch, replace the P switch. After that, I turn power on and re-push P switch again. P switch can turn on and multifunction display was dis-appear.

    I check by Techstream V13.0. He shows on C2300. Do you have any advise for C2300, please?
     

    Attached Files:

    #9 worrachai, Nov 16, 2020
  10. vvillovv

    vvillovv Senior Member

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    C2300 is very similar as P085D - much the same description for both

    C2300 - Toyota Diagnostic Trouble Code (DTC) Definition, Causes and Diagnosis


    Toyota DTC C2300
    Make:
    Toyota
    Code:
    C2300
    Definition:
    Actuator System Malfunction
    Description:
    Open or short in the P CON MTR relay (transaxle parking lock control relay) or shift control actuator assembly (parking lock motor or rotation angle sensor), or internal malfunction of the shift control actuator assembly (parking lock motor or rotation angle sensor).
    Cause:​
    • Transmission control ECU assembly​
    • Auxiliary battery​
    • Shift control actuator assembly​
    • Hybrid vehicle transaxle assembly​
    • Wire harness or connector​


    ​
     
    #10 vvillovv, Nov 18, 2020
  11. worrachai

    worrachai Junior Member

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    After change new P switch + clear DTC code C2300. Drive 1 week, Today I re-check DTC again. No any error appear by techstream.
    - My repair
    1. Replace new Battery 12v
    2. Change P switch

    My comment is battery 12v when low voltage and low CCA, anything can happen due to not enought battery power. Do you have any idea for P switch was defect?

    If anyone has more comment, please add.
     
    #11 worrachai, Nov 23, 2020
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