P0731
PowertrainTransmissionhigh severityGear 1 Incorrect Ratio
What P0731 Means
Incorrect gear ratio detected in 1st gear.
Symptoms
- Slipping in 1st gear
- Harsh 1-2 shift
- No 1st gear
Common Causes
- 1st gear clutch pack worn
- Shift solenoid issue
- Valve body problem
- Low line pressure
Diagnostic Steps
- Check fluid
- Test shift solenoids
- Monitor gear ratio in 1st
- Check line pressure
Where to start: Internal transmission service may be needed.
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