P0730 — Incorrect Gear Ratio

P0730 means incorrect gear ratio. The transmission isn't achieving the gear ratio the computer commanded — it's slipping. The input and output speed senso

Stop driving

Pull over safely — continued driving risks serious damage.

What it means

The transmission isn't achieving the gear ratio the computer commanded — it's slipping. The input and output speed sensors disagree.

Most likely causes, ranked

  1. Low or degraded transmission fluid

    Check first — cheapest fix.

  2. Worn clutches/bands

    Internal wear.

  3. Failing shift solenoid

    Not engaging the gear fully.

  4. Faulty speed sensor

    Bad ratio math.

  5. Torque converter issue

    Not locking/transferring properly.

Typical repair cost

Typically $100–$3500

Fluid service $100–$250; solenoid $200–$500; rebuild $2,500–$3,500+. Estimates vary by vehicle. Costs are estimates and vary by vehicle, location, and shop.

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Common questions

Is P0730 serious?

If the transmission is slipping badly, stop driving — slipping generates destructive heat and turns a fluid/solenoid job into a full rebuild. If shifts feel mostly normal, drive gently to a shop now.

How much does it cost to fix P0730?

Typically $100–$3500. Fluid service $100–$250; solenoid $200–$500; rebuild $2,500–$3,500+. Estimates vary by vehicle.

Can I drive with P0730?

Pull over safely — continued driving risks serious damage.

What causes P0730?

The most common cause is low or degraded transmission fluid. Check first — cheapest fix.

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