What does a P1721 code mean?



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Thread: What does a P1721 code mean?

  1. #1
    Join Date
    May 2016
    Location
    California
    Posts
    27


    What does a P1721 code mean?

    Folks,

    My 98 Chrysler T&C Lxi with a 3.8 is now showing a P1721 code from the OBDII. Does anyone know what this means and the likely repair?

    I've seen references to needing a TCM code reader to get further info. Can anyone suggest a device that would read TCM codes?

    TIA

    Mark.

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  3. #2
    Join Date
    Nov 2013
    Location
    Oshawa, Ontario
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    1,569


    1 out of 1 members found this post helpful.
    2015 Grand Caravan SXT Plus
    Granite Crystal Metallic
    25,xxx Kms
    5w-20 Pennzoil Platinum w Pure Plus/Wix filter 10010

  4. The Following User Says Thank You to JC1 For This Useful Post:

    Caraman99(03-18-2017)

  5. #3
    Join Date
    Jan 2015
    Location
    TEXAS, USA
    Posts
    3,631


    Quote Originally Posted by MarkD View Post
    Folks,

    My 98 Chrysler T&C Lxi with a 3.8 is now showing a P1721 code from the OBDII. Does anyone know what this means and the likely repair?

    I've seen references to needing a TCM code reader to get further info. Can anyone suggest a device that would read TCM codes?

    TIA

    Mark.
    See bellow:


    P1721 Gear 1 Incorrect Ratio

    Possible causes:
    • Faulty Vehicle Speed Sensor
    • Vehicle Speed Sensor harness is open or shorted
    • Vehicle Speed Sensor harness is open or shorted
    • Vehicle Speed Sensor circuit poor electrical connection
    • Transmission Control Module (TCM) communication







    2012 Town & Country
    2006 Dodge Grand Caravan. 317,000 + Miles. -SOLD-
    Current Minivans I own.
    LEVY --UNKNOWN MEMBER--

  6. The Following User Says Thank You to LEVY For This Useful Post:

    MarkD(03-18-2017)

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  8. #4
    Join Date
    May 2016
    Location
    California
    Posts
    27


    Seems like mysterious computer-speak. What thing do I hit with a hammer or what bolt do I turn with a wrench to fix said mystery?

  9. #5
    Join Date
    Jan 2017
    Location
    Montreal
    Posts
    380


    Quote Originally Posted by JC1 View Post
    Thanks for that, bookmarked for sure!
    Steve
    1999 Caravan LE, 3.3L, 300,000KM
    2005 Saturn Vue AWD (Honda J35 3.5 V-TEC 260HP) 216,000KM
    1982 Suzuki Katana,(ported/shaved head,11:1,4in1,KNre-cal/filters,cam,120HP)

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