P0730 to P0736: incorrect gear ratio
The gearbox computer measured a ratio between input and output speed that does not match the gear it engaged. P0731 to P0735 name the gear, P0736 reverse.
SeverityHighCarrying on can cause expensive damage, so deal with it now.
Can you keep driving?Only as far as the workshopWhat does P0730 mean?
In each gear, the input and output shafts turn at a fixed ratio. When the measured ratio does not match, a clutch or band inside the gearbox is slipping, or a speed sensor is lying. A slipping gearbox heats its fluid quickly, and the heat wears the clutches faster, so a small problem can grow into a rebuild if the car keeps being driven.
What causes P0730?
- Low or burnt transmission fluid
- A worn clutch pack or band for the gear named
- A shift or pressure control solenoid that is not building pressure
- A faulty input or output speed sensor giving a false ratio
- Internal wear such as a leaking seal or a damaged valve body
What to check first for P0730
- Check the fluid level and condition first, where the gearbox allows it
- Rule out speed sensor codes before condemning the clutches
- Note how the slip feels: engine speed flaring between or within gears
- Have a pressure test done before the gearbox is removed
Can you drive with P0730?
Drive as little as possible, gently and only to a workshop. If the car flares, loses drive or will not engage reverse, stop and have it towed: driving a slipping gearbox destroys it quickly and can leave you without drive in traffic.
In states with an OBD-II emissions inspection, a car with the check engine light on fails the test until the fault is fixed.
Codes on this page
- P0730Incorrect Gear Ratio
- P0731Gear 1 Incorrect Ratio
- P0732Gear 2 Incorrect Ratio
- P0733Gear 3 Incorrect Ratio
- P0734Gear 4 Incorrect Ratio
- P0735Gear 5 Incorrect Ratio
- P0736Reverse Incorrect Ratio
Related codes
Checked on · Rafael Soares
These are the generic meanings every manufacturer shares. Each brand adds its own detail, so your car's handbook, its service information and a qualified mechanic have the last word. OdoKeep has no connection with any manufacturer, and the app does not read codes from the car.
