The P0872 code in your 2021 Kia K5 indicates the torque converter clutch slip speed sensor circuit is providing lower readings than expected. This affects the TCM's ability to accurately monitor TCC engagement and slip.
Understanding Low Slip Speed Readings
The K5's TCM calculates TCC slip from engine and transmission speed signals. Low readings may indicate sensor circuit issues causing inaccurate calculations, or actual conditions where slip is less than expected (not necessarily a problem).
Common Causes of P0872
- Transmission input speed sensor issues
- Sensor circuit resistance
- Signal wire damage
- Connector corrosion
- TCM input circuit problems
- Reference voltage issues
Symptoms of Low Sensor Input
- TCC control issues
- Check engine light on
- Transmission may limit TCC operation
- Possible shift quality changes
- Fuel economy impact
- Diagnostic data inaccurate
K5 Transmission Options
The K5 is available with either an 8-speed automatic or a DCT. P0872 interpretation may vary slightly based on your specific transmission.