Transmission Fluid Temperature Sensor Circuit Malfunction
What does this mean?
Code P0710 indicates a malfunction in the transmission fluid temperature sensor circuit.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Subaru Wrx models manufactured from 1996 to 2026. However, please note that the presence of this specific code depends on your vehicle's exact engine configuration, options, and production year.
Common Causes
Low, dirty, or burnt transmission fluid
Damaged, chafed, or broken wiring harness
Corroded or loose electrical connector
Internal PCM/ECM failure
Symptoms to Watch For
- Check Engine Light is illuminated
- Transmission overheating warning
- Hard or harsh gear shifting
- Delayed gear engagement
How to Diagnose
Common Solutions
Replace the Transmission Fluid Temperature (TFT) Sensor: This is the most frequent solution if the sensor itself is found to be faulty during electrical testing. The sensor may be a standalone unit, integrated into the transmission's lead frame, or part of a larger solenoid pack, requiring varying degrees of transmission disassembly.
Repair or Replace Damaged Wiring and/or Connectors: If the diagnostic steps reveal an open circuit, short circuit, high resistance, or corrosion within the TFT sensor's wiring harness or connector, repairing the damaged section or replacing the connector will resolve the P0710 code.
Address Transmission Control Module (TCM) or Powertrain Control Module (PCM) Malfunction: In rare cases, if the sensor and all associated wiring test perfectly, the issue may lie within the TCM/PCM's internal circuitry responsible for processing the TFT sensor input. This would necessitate further advanced diagnostics and potentially module replacement or reprogramming.