Check Engine Code
P0730
Incorrect Gear Ratio
What P0730 means
P0730 means the ECM/TCM compared input-shaft speed to output-shaft speed and found the ratio doesn't match the gear it commanded. That points to slipping clutches, a shift-control fault, or a fluid problem rather than a single sensor.
Symptoms
- Check engine light on
- Harsh, erratic, or delayed shifts
- Slipping — RPM flares without matching acceleration
- Transmission stuck in one gear / limp mode
Likely causes (most common first)
- Low, burnt, or worn-out transmission fluid
- Worn clutches or bands inside the transmission
- Faulty shift solenoid or valve-body problem
- Failing torque converter
- Input/output speed sensor fault
Can I keep driving?
Minimize driving. Start with a fluid level/condition check — but slipping under load accelerates internal wear and can end in a rebuild.
Typical repair cost
DIY fixes can start near $150 (parts only). Shop repairs for P0730 typically run up to $3500 depending on the underlying cause and vehicle. Start with the most common cause — Low, burnt, or worn-out transmission fluid — before throwing parts at it.
Recommended parts & tools for P0730
Our buyer’s guides cover the tools and parts that pair with AXLY:
As an Amazon Associate, AXLY earns from qualifying purchases.
Related codes
Confirm P0730 yourself in 60 seconds
Two cheap things and you can read P0730 yourself — plus every other stored code and live engine data, free. No subscription.