Severity: High
Can damage expensive parts or affect drivability. Limit driving and book promptly.
What P0730 means
The transmission computer compared input and output speeds and the ratio does not match any gear: it is slipping.
Symptoms
- Slipping or flaring
- Limp mode
- Delayed engagement
Common causes
Most likely first
- 1Low fluid
- 2Worn clutches
- 3Shift solenoid or valve body
- 4Speed sensor fault
How we diagnose it
- Check fluid level
- Review which gear ratio failed
- Check speed sensor signals
Every vehicle sets codes under its own conditions. We check the factory diagnostic steps and service bulletins for your VIN, so the repair targets the actual cause.