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What Does P0729 Code Mean?

    OBD-II Code P0729 is defined as a Gear 6 Incorrect Ratio

    The Input Speed Sensor tells the Transmission Control Module (TCM) how fast the engine is spinning so the correct gear can be engaged. The Output Speed Sensor tells the Transmission Control Module (TCM) how fast the output shaft of the transmission is spinning so it can verify the correct gear is engaged. The TCM compares both signals to verify the transmission is in the desired gear. If it is determined that the transmission is not in the desired gear, the engine control module (PCM) or TCM will set code P0729.

    P0729 Symptoms

    • Increased fuel consumption
    • Transmission may not shift properly

    Common Problems That Trigger the P0729 Code

    • Internal transmission failure
    • Powertrain Control Module (PCM) failure
    • Transmission Control Module (TCM) failure
    • Transmission fluid level is low
    • Transmission valve body failure
    • Wiring issue

    Common Repairs Needed for the P0729 Code

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