Diagnostic Instructions

DTC Descriptors

DTC P0711: Transmission Fluid Temperature (TFT) Sensor Performance

DTC P0712: Transmission Fluid Temperature (TFT) Sensor Circuit Low Voltage

DTC P0713: Transmission Fluid Temperature (TFT) Sensor Circuit High Voltage

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
TFT Sensor Signal	P0712	P0713	P0713	P0711
Low Reference	--	P0713	--	P0711

Typical Scan Tool Data

Trans. Fluid Temp.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running in Park, normal operating temperature Parameter Normal Range: -39 to +149°C (-38 to +300°F)
TFT Signal	Greater than 149°C (300°F)	Less than -39°C (-38°F)	Less than -39°C (-38°F)*
Low Reference	--	Less than -39°C (-38°F)	Less than -39°C (-38°F)*
* Internal TFT sensor damage may result if shorted to B+

Circuit/System Description

The primary source of heat in the transmission is the drive motor generators. The drive motor generators are cooled by the transmission fluid. Hot fluid exits the drive motor generators and flows to the transmission cooler supply line. The supply line connects to the cooler, which is in front of the radiator. The transmission fluid cooler pipe assembly is equipped with an internal thermostat that opens at 80°C (176°F) for optimum transmission operation and fuel economy. The transmission cooler pipe thermostat is part of the transmission fluid cooler pipe assembly, located near the transmission and is not serviced separately. From the cooler, the fluid returns through the transmission fluid cooler pipe assembly and enters the lubrication circuits. After lubricating the internal components, the fluid returns to the oil pan. The transmission fluid temperature (TFT) sensor is located in the control solenoid (w/body and TCM) valve assembly and is not serviced separately.

Conditions for Running the DTC

P0711

P0712

DTC P0712 is not failed this ignition cycle.

P0713

DTC P0713 is not failed this ignition cycle.

Conditions for Setting the DTC

P0711 - Fail Case 1

P0711 - Fail Case 2

P0711 - Fail Case 3

The TFT changes by greater than or equal to 20°C (36°F) 5 times over 7 seconds.

P0711 - Fail Case 4

P0712

The TFT is greater than or equal to 160°C (320°F) for greater than 25 seconds.

P0713

The TFT is less than or equal to -60°C (-76°F) for greater than 10 seconds.

Action Taken When the DTC Sets

Conditions for Clearing the DTC

Diagnostic Aids

The driver information center (DIC), if equipped, will display ‘TRANSMISSION HOT - Idle Engine’ when the TFT reaches 132°C (270°F). The TFT parameter on the scan tool should rise steadily to a normal operating temperature, and then stabilize. Ask about the customer’s driving habits, trailer towing, overloading, etc. Ensure the engine and transmission cooling system is functioning normally.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Special Tools

J 24731 Tempil Stick

Circuit/System Verification

Start the engine and operate the vehicle at 64 km/h (40 mph) while observing the TCM temperature sensor and the TFT sensor.

Circuit/System Testing

1. Inspect the transmission cooling system for restrictions or damage.

⇒	If a concern is found, repair or replace the restricted or damaged components as necessary.

2. Inspect the transmission cooler line thermostat for a stuck open or closed condition.

⇒	If a concern is found repair or replace the damaged components as necessary.

3. Clear the DTC and operate the vehicle under the conditions for running and setting the DTC. Verify that the DTC does not reset.

⇒	If the DTC resets, replace the control solenoid (w/body and TCM) valve assembly.

Component Testing

Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.