P0712 CHEVROLET - Transmission Fluid Temperature Sensor Circuit Low Input
Faulty Transmission Fluid Temperature Sensor
Transmission Fluid Temperature Sensor harness is open or shorted
Transmission Fluid Temperature Sensor circuit poor electrical connection
When is the code detected?
Transmission Control Module (TCM) detects excessively low voltage from the fluid temperature sensor.
Engine Light ON (or Service Engine Soon Warning Light)
Possible shifting problems
P0712 Chevrolet Description
The Automatic Transmission Fluid Temperature (TFT) sensor is a resistor, or thermistor, which changes value based on temperature. The sensor has a negative-temperature coefficient. This means that as the temperature increases, the resistance decreases, and as the temperature decreases, the resistance increases. The Powertrain Control Module (PCM
) supplies a 5-volt reference signal to the sensor and measures the voltage drop in the circuit. When the transmission fluid is cold, the sensor resistance is high and the PCM
detects high signal voltage. As the fluid temperature warms to a normal operating temperature, the resistance becomes less and the signal voltage decreases.