The P0870 code in your 2020 Nissan Maxima indicates the torque converter clutch solenoid circuit is operating outside its expected range. While the Maxima uses a CVT, it still employs a torque converter with a lockup clutch controlled by this solenoid.
TCC in CVT Transmissions
The Maxima's Xtronic CVT uses a torque converter for initial vehicle launch, then locks up for efficiency at cruise. The TCC solenoid controls this lockup function. P0870 indicates the solenoid circuit is not operating within normal parameters.
Common Causes of P0870
- TCC solenoid degradation
- Electrical circuit resistance issues
- CVT fluid contamination
- Valve body affecting solenoid operation
- Wiring damage
- TCM output issues
Symptoms of TCC Solenoid Range Issues
- TCC lockup problems
- Check engine light on
- Reduced fuel economy
- Higher RPM at highway speeds
- CVT shudder
- Possible overheating
Maxima CVT Maintenance
The Maxima CVT requires specific NS-3 fluid. Fluid condition directly affects solenoid operation. Regular CVT fluid service helps prevent P0870.