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Porsche transmission gear error code  The error code P0730 indicates a problem with a vehicle’s transmission, specifically that the transmission’s gear ratio is not functioning as expected. This error can occur in both manual and automatic transmissions and is a serious warning that the transmission may not be working properly.

What Does P0730 Mean?

The error code P0730 is triggered when the transmission control module (TCM) detects a deviation between the expected and actual gear ratios. This may indicate a serious problem that requires immediate attention.

Causes of P0730

  • Transmission wear: Worn gears or damaged components within the transmission can lead to incorrect gear ratios.
  • Transmission fluid problems: Low, contaminated or incorrect types of transmission fluid can cause transmission malfunctions.
  • Sensor or solenoid failures: Faulty sensors or solenoids can send incorrect signals to the TCM, resulting in incorrect gear ratios.
  • Software problems: Sometimes a firmware update of the TCM may be necessary to resolve communication problems.

Symptoms of P0730

  • Jerky shifting: The vehicle may shift gears roughly or hesitate while shifting gears.
  • Gear slip: The transmission may slip while shifting gears, resulting in a noticeable loss of power.
  • Increased fuel consumption: Inefficient transmission performance can increase fuel consumption.
  • Engine failure light illuminated: The dashboard may warn of an engine failure or transmission problem.

Solutions for P0730

  • Check the transmission fluid: Make sure the level, condition and type of fluid are correct.
  • Transmission diagnosis: Have a full diagnostic scan performed to identify specific problems.
  • Replace damaged components: Worn or damaged transmission components should be replaced.
  • Reset or update the TCM software: Sometimes resetting or updating the software can solve the problem.


The error code P0730 is a serious indication that something is wrong with the vehicle’s transmission. Prompt diagnosis and repair are essential to prevent further damage to the vehicle and to ensure safe and efficient performance. Ignoring this warning can lead to costly repairs and potential safety hazards while driving.