DCT Odd Gear Synchronizer Ring Worn
2014-2021 BMW i3 Range Extender
Description
The synchronizer ring for the odd gear set (1st, 3rd, 5th) in the DCT is worn beyond tolerance, causing grinding or difficulty engaging gears.
Symptoms
- Grinding noise on 1-3-5 gear engagement
- Delayed odd gear shifts
- Harsh engagement in 1st gear from stop
- Metallic particles in fluid
- Gear rejection on fast shifts
Common Causes
- Synchronizer ring wear from aggressive shifting
- Insufficient lubrication
- Manufacturing defect
- High-mileage wear
- Clutch engagement timing error causing ring stress
Diagnostic Steps
- Listen for grinding during odd gear engagement
- Check DCT fluid for metallic particles
- Monitor gear engagement time for odd gears
- Compare odd vs even gear shift quality
- Review TCM shift strategy data
Repair Notes
Transmission disassembly required to replace synchronizer rings. Address clutch engagement timing if contributing to accelerated wear.
Related Codes
Other Powertrain Codes
- P0070Ambient Air Temperature Sensor Circuit
- P0071Ambient Air Temperature Sensor Range/Performance
- P0072Ambient Air Temperature Sensor Circuit Low
- P0073Ambient Air Temperature Sensor Circuit High
- P0115Engine Coolant Temperature (ECT) Sensor 1 Circuit
- P0116ECT Sensor 1 Circuit Range/Performance
- P0117ECT Sensor 1 Circuit Low Input
- P0118ECT Sensor 1 Circuit High Input
- P0119ECT Sensor 1 Circuit Intermittent
- P0125Insufficient Coolant Temperature for Closed Loop Fuel Control
P3047 on Other Vehicles
Common Questions
What does code P3047 mean on a 2014-2021 BMW i3?
P3047 stands for "DCT Odd Gear Synchronizer Ring Worn". The synchronizer ring for the odd gear set (1st, 3rd, 5th) in the DCT is worn beyond tolerance, causing grinding or difficulty engaging gears.
What are the symptoms of P3047 on a BMW i3?
Common symptoms of P3047 include: Grinding noise on 1-3-5 gear engagement, Delayed odd gear shifts, Harsh engagement in 1st gear from stop, Metallic particles in fluid, Gear rejection on fast shifts.
What causes P3047 on a 2014-2021 BMW i3?
Common causes of P3047 include: Synchronizer ring wear from aggressive shifting, Insufficient lubrication, Manufacturing defect, High-mileage wear, Clutch engagement timing error causing ring stress.