P0730 — Incorrect Gear Ratio

P0730: Incorrect Gear Ratio — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Incorrect Gear Ratio. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • Slipping; delayed engagement and harsh shifts.

Possible causes

  • Low/contaminated ATF, faulty solenoids or worn clutches.

What to check

  • Check fluid and input/output sensor signals; request hydraulic diagnosis.

Also written as: P0730-00, P073000, PO730 (some scan tools add the fault-type byte, e.g. -00).