P0730

Incorrect Gear Ratio

Q: What does fault code P0730 mean?

Incorrect Gear Ratio. The TCM has detected that the actual gear ratio does not match the theoretical gear ratio for the commanded gear.

Q: What are the possible causes of P0730?

Transmission internal clutch plates worn or burned; Insufficient transmission fluid or degraded fluid; Transmission solenoid fault causing incomplete shift; Transmission mechanical component damage; TCM software needs update.

Severity: High Transmission System Generic Code

Detailed Description

The TCM has detected that the actual gear ratio does not match the theoretical gear ratio for the commanded gear.

Possible Causes

Transmission internal clutch plates worn or burned

Insufficient transmission fluid or degraded fluid

Transmission solenoid fault causing incomplete shift

Transmission mechanical component damage

TCM software needs update.

Solutions & Repair Guide

First check transmission fluid level and quality (in many cases a fluid change improves the condition); Check transmission solenoid operation; If fluid quality is normal and solenoids have no faults, the transmission internals may need to be disassembled for inspection. This is a relatively serious transmission fault code.

Disclaimer: The information above is for reference only and does not constitute professional repair advice. Actual causes may vary depending on vehicle make, model, year, and configuration. Always consult a qualified technician for accurate diagnosis.