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P0730Cars & SUVs
Hard

P0730 — Incorrect gear ratio

The transmission sees a gear ratio that does not match engine and vehicle speed. Symptoms can include harsh shifts, slip, or refusal to shift.

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Likely causes

  • Low, burned, or contaminated transmission fluid
  • Worn internal clutches or brake bands
  • Faulty output or input speed sensor

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Recommended checks

  1. 1

    Change the transmission fluid and filter

  2. 2

    Test the input and output speed sensors

  3. 3

    See a transmission specialist if the failure is internal

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Parts to replace