Torque Converter Lock-Up Solenoid Circuit
2014-2021 BMW i3 Range Extender 🇦🇺
Description
The DME or EGS detected a malfunction in the torque converter lock-up solenoid circuit. The solenoid controls engagement of the torque converter clutch for improved fuel efficiency at highway speeds.
Symptoms
- Check Engine Light
- No torque converter lock-up
- Reduced fuel economy on highway
- Transmission overheating
- Slight RPM flare at cruise
Common Causes
- Faulty torque converter clutch solenoid
- Wiring fault in solenoid circuit
- Connector corrosion
- Low transmission fluid level
- EGS driver circuit failure
Diagnostic Steps
- Test TCC solenoid resistance
- Inspect wiring to solenoid
- Check transmission fluid level and condition
- Monitor TCC commanded vs actual engagement
- Check connector at transmission
Repair Notes
Replace the torque converter lock-up solenoid or repair the wiring fault.
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
P1755 on Other Vehicles
Common Questions
What does code P1755 mean on a 2014-2021 BMW i3?
P1755 stands for "Torque Converter Lock-Up Solenoid Circuit". The DME or EGS detected a malfunction in the torque converter lock-up solenoid circuit. The solenoid controls engagement of the torque converter clutch for improved fuel efficiency at highway speeds.
What are the symptoms of P1755 on a BMW i3?
Common symptoms of P1755 include: Check Engine Light, No torque converter lock-up, Reduced fuel economy on highway, Transmission overheating, Slight RPM flare at cruise.
What causes P1755 on a 2014-2021 BMW i3?
Common causes of P1755 include: Faulty torque converter clutch solenoid, Wiring fault in solenoid circuit, Connector corrosion, Low transmission fluid level, EGS driver circuit failure.