P0712
DTC P0712
Circuit Description
The automatic transmission fluid temperature (TFT) sensor is a negative coefficient thermistor whose resistance value changes based on temperature. The transmission control module (TCM) provides a 5-volt reference to the sensor circuit. A high TFT or a short to ground on the signal circuit results in low signal voltage. The TFT sensor operating range is -40 to +151°C (-40 to +304°F).
If the TCM detects a continuous short to ground in the TFT sensor signal circuit, then DTC P0712 sets. DTC P0712 is a type C DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0712 Transmission Fluid Temperature (TFT) Sensor Circuit Low Voltage
Conditions for Running the DTC
The engine is running for 5 seconds.
Conditions for Setting the DTC
The TCM detects a TFT greater than 150°C (302°F) for 12 seconds.
Action Taken When the DTC Sets
* The TCM does not request the engine control module (ECM) to illuminate the malfunction indicator lamp (MIL).
* The TCM freezes transmission adaptive functions.
* The TCM calculates a default TFT from the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor.
* The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Records.
* The TCM stores DTC P0712 in TCM history.
Conditions for Clearing the DTC
* A scan tool can clear the DTC.
* The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non-emission related diagnostic fault occurring.
* The TCM cancels the DTC default actions when the fault no longer exists and the DTC passes.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. A value less than 0.2-volt indicates the condition is present. A value above 0.2-volt indicates the condition is intermittent.
3. A value greater than 4.9-volts indicates the condition is in the transmission side.
5. For resistance at other temperatures, refer to Transmission Fluid Temperature Sensor Specifications.
