The P0710 code in your 2019 Nissan Altima indicates a general malfunction with the transmission fluid temperature (TFT) sensor circuit. Your Altima uses a continuously variable transmission (CVT) that is particularly sensitive to fluid temperature. The TCM relies on accurate temperature data to control CVT operation for optimal performance and protection.
Importance of TFT in CVT Systems
CVT fluid temperature is critical because the transmission adjusts its operation based on temperature. When cold, the CVT needs to build hydraulic pressure differently than when warm. If fluid gets too hot, the transmission must protect itself. Without accurate temperature data from the TFT sensor, the CVT cannot operate correctly.
What Causes P0710
The TFT sensor itself may have failed internally. Wiring issues between the sensor and TCM cause signal loss or incorrect readings. A corroded connector at the transmission case affects signal quality. In some cases, the TCM's TFT input circuit has malfunctioned. Low transmission fluid affecting sensor readings or exposure to debris can also trigger this code.
Symptoms in Your Altima
CVT behavior may become erratic as it can't determine proper operating temperature. The transmission may stay in a "cold" protection mode even when warm, limiting performance. It might enter high-temperature protection mode when temperatures are normal. Fuel economy may suffer, and the check engine light illuminates.
Diagnostic Approach
Using Nissan CONSULT, monitor the TFT sensor reading and compare to actual fluid temperature (use an infrared thermometer on the transmission case). Check for consistency—the reading should change logically with engine operation. Test sensor resistance at various temperatures against specifications. Inspect wiring and connectors for damage.