MasterTuning Fault code dictionary (DTC)

P0730 — Incorrect gear ratio detected in the transmission

Severity: Serious Can you drive? With caution: limp mode possible, have it checked soon Make: All makes (OBD-II standard)
MeaningThe transmission control computer has noticed a mismatch between how fast the engine is turning and how fast the wheels are turning for the gear selected. In plain terms, the transmission is slipping internally or the gears are not engaging correctly.
FamilyPowertrain (P)

Typical symptoms

The engine revs up high without a normal increase in vehicle speed
The transmission hesitates or delays when shifting gears
The check engine light is illuminated on the dashboard
The car may enter a safe mode, limiting gear selection

Common causes

Low transmission fluid level or degraded fluid condition
Worn internal clutches or mechanical components inside the transmission
Faulty hydraulic shift solenoids or blocked valve body passages
Defective input or output speed sensors sending wrong data

What to do

Check the transmission fluid level and condition as your very first step, as old or low fluid is the most common external trigger. Do not ignore this code, because continued driving with internal slip can quickly destroy the transmission completely.

Frequently asked questions

What does code P0730 mean?

Incorrect gear ratio detected in the transmission. The transmission control computer has noticed a mismatch between how fast the engine is turning and how fast the wheels are turning for the gear selected. In plain terms, the transmission is slipping internally or the gears are not engaging correctly.

Can I keep driving with code P0730 active?

With caution: limp mode possible, have it checked soon

Common causes — P0730

Low transmission fluid level or degraded fluid condition Worn internal clutches or mechanical components inside the transmission Faulty hydraulic shift solenoids or blocked valve body passages Defective input or output speed sensors sending wrong data

How do you fix code P0730?

Check the transmission fluid level and condition as your very first step, as old or low fluid is the most common external trigger. Do not ignore this code, because continued driving with internal slip can quickly destroy the transmission completely.

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