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Diagnose/P0730
P0730Critical SeverityTransmission

Incorrect Gear Ratio

What This Means

The transmission is not achieving the expected gear ratio. The computer compares input and output speed sensors and has determined that the gear ratio does not match what it commanded.

Common Symptoms

  • Transmission slipping
  • Harsh or flared shifts
  • Vehicle won't shift properly
  • Reduced power and limp mode

Common Causes

  • Low or contaminated transmission fluid
  • Worn clutch packs or bands
  • Faulty solenoid pack
  • Internal transmission mechanical failure
  • Torque converter issue

Estimated Repair Cost

$500 – $4000
Parts and labor (varies by vehicle and location)
Difficulty:Professional

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For informational purposes only. Diagnostic trouble codes are starting points for diagnosis, not definitive answers. Always consult a certified mechanic for proper diagnosis and repair. Estimated costs vary by vehicle, location, and shop rates.