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P0730

High Severity

Incorrect Gear Ratio

Transmission System

What Does P0730 Mean?

The TCM detects that the actual gear ratio does not match the commanded gear.

Common Fix

Transmission fluid service or rebuild

Estimated Cost (DIY)

$50 - $3,000

Symptoms

  • ⚠️Transmission slipping
  • ⚠️RPM flares during shifts
  • ⚠️Harsh engagement
  • ⚠️Check engine light

Common Causes

Low or burnt transmission fluidlikely
Worn clutch packspossible
Faulty shift solenoidpossible
Internal transmission damagepossible

How to Diagnose P0730

  1. 1Check transmission fluid level and condition
  2. 2If fluid is dark/burnt, service transmission
  3. 3Check for specific solenoid codes
  4. 4Transmission may need rebuild if fluid is OK

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Frequently Asked Questions

Is P0730 a death sentence for the transmission?
Not necessarily β€” it could be as simple as low fluid. Check fluid first. If fluid is fresh and full, internal wear is more likely.
How much does a transmission rebuild cost?
Professional rebuild: $1,500-$3,500. Remanufactured transmission: $1,000-$2,500. Always check fluid first.

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