P0712: Transmission Fluid Temperature Sensor A Circuit Low — what it means, the affected system and what to check before replacing parts.
Meaning, symptoms, causes and checks
Transmission Fluid Temperature Sensor A Circuit Low. Basic catalogue definition; diagnostic details have not yet been reviewed.
Affected system: Powertrain
Symptoms
- A warning light may appear, and transmission shift behavior may change if temperature data is unreliable.
- P0712 describes a low electrical signal from fluid-temperature sensor A, not proof that the transmission fluid is physically too cold.
Possible causes
- A faulty temperature sensor, connector or damaged wiring can affect the sensor signal.
- Circuit faults such as a short to ground may produce a low reading, depending on the vehicle's wiring design.
What to check
- Read P0712, related transmission codes and freeze-frame data before clearing anything.
- Compare live fluid-temperature data with plausible ambient conditions when cold; inspect the sensor connector and harness.
- Test the signal and ground according to the vehicle-specific wiring diagram before replacing the sensor.
Also written as: P0712-00, P071200, PO712 (some scan tools add the fault-type byte, e.g. -00).