Trouble codes › P0730
P0730 Incorrect Gear Ratio
Transmission
P0730 means the transmission isn't holding the gear it's supposed to be in: something is slipping.
The transmission computer compares input and output shaft speeds. P0730 means the ratio doesn't match any gear it should be in: something is slipping or a shift isn't completing.
Drive as little as possible. A slipping transmission overheats and wears quickly, turning a smaller repair into a rebuild.
Common causes
- Low, burnt or wrong transmission fluid
- Worn clutches or bands (internal wear)
- A failing shift solenoid or valve body problem
- A faulty speed sensor reading wrong
Symptoms
- Slipping, engine revving without acceleration
- Harsh or delayed shifts
- Limp mode
Common on: Honda Odyssey
What to check first
- Check the fluid level and condition the way your owner's manual describes; burnt-smelling or dark fluid with debris points to internal wear.
- Check for other transmission codes (speed sensors, solenoids).
- Check for service bulletins and software updates for your transmission.
- Have it diagnosed by a transmission shop if fluid and sensors are fine.
What does P0730 mean on your vehicle?
The likely cause depends on your engine. iRepair researches your exact year, make, model and engine (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.
Ask iRepair about P0730No scanner? Most auto parts stores read check-engine codes for free.
Related codes
General guidance for P0730 on most vehicles. Some makers use the same code a little differently; confirm in the service information for your vehicle, put safety first, and see a professional when in doubt.