P0731high severityPowertrain
Gear 1 Incorrect Ratio
on 1999 BMW 540iT E39 4.4L V8 · RWD
What this code 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
Repair notes
Internal transmission service may be needed.
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