The P0871 code in your 2022 Hyundai Sonata indicates the torque converter clutch slip speed sensor is reading outside its expected range. This sensor monitors the difference between engine RPM and transmission input speed to calculate TCC slip.
Understanding TCC Slip Monitoring
The Sonata's TCM monitors the difference between crankshaft RPM and transmission input speed. This difference represents torque converter slip. P0871 indicates the calculated slip values are outside normal parameters.
Common Causes of P0871
- Transmission input speed sensor issues
- Crankshaft position sensor problems
- Actual excessive TCC slip
- Worn torque converter clutch
- Transmission fluid issues
- Valve body affecting TCC operation
Symptoms of Slip Sensor Range Issues
- TCC slip detection fault
- Check engine light on
- Reduced fuel economy
- Higher than normal RPM at cruise
- TCC shudder possible
- Transmission may limit TCC lockup
Sonata DCT Considerations
Some Sonatas use a dual-clutch transmission rather than a traditional automatic. The specific code interpretation may vary based on your transmission type.