Diagnostic Trouble Code
P0730 — Incorrect Gear Ratio
Incorrect Gear Ratio
Definition
The TCM has detected that the actual gear ratio does not match the expected gear ratio. This indicates the transmission is not achieving the correct gear — it may be slipping, stuck between gears, or has an internal mechanical failure.
Common Causes
- Low or contaminated transmission fluid
- Worn clutch packs or bands
- Faulty shift solenoids
- Internal transmission mechanical failure
- Valve body malfunction