P0712
DTC P0712 or P0713
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0712
- Transmission Fluid Temperature (TFT) Sensor Circuit Low Voltage
DTC P0713
- Transmission Fluid Temperature (TFT) Sensor Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The transmission fluid temperature (TFT) sensor is a 2 wire sensor located in the pressure switch manifold (PSM). The transmission control module (TCM) supplies a signal circuit and a low reference circuit to the TFT sensor. The resistance of the TFT sensor decreases as the oil temperature increases. The TCM monitors the voltage drop across the TFT sensor and calculates the temperature of the transmission fluid in the oil pan.
Conditions for Running the DTC
P0712
* DTC P0711, P0712, or P0713 is not set.
* Battery voltage is between 9-18 V.
* Engine speed is greater than 200 RPM for 5 seconds.
P0713
* DTC P0711, P0712, or P0713 is not set.
* Battery voltage is between 9-18 V.
* Engine speed is greater than 200 RPM.
* Engine has been running for 20 seconds with an engine coolant temperature (ECT) greater than 20°C (68°F).
* The ECT is not defaulted.
Conditions for Setting the DTC
P0712
This DTC sets when the TCM detects a TFT of 150°C (302°F) or greater for 2.5 seconds.
P0713
This DTC sets when the TCM detects a TFT of -45°C (-49°F) or lower for 2.5 seconds.
Action Taken When the DTC Sets
P0712 or P0713
* DTCs P0712 and P0713 are Type B DTCs.
* The transmission fluid temperature defaults to a calibration value.
Conditions for Clearing the DTC
DTCs P0712 and P0713 are Type B DTCs.
Diagnostic Aids
* If both DTCs P0712 and P0218 are set in combination, diagnose P0712 prior to proceeding to P0218.
* A short to ground on the reference circuit may allow P0712 to set. A fluid temperature of 160°C (320°F) observed on the scan tool may indicate that this has occurred.
* You may have to drive the vehicle in order to experience a condition.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics (Diagrams)
Connector End View Reference
* Component Connector End Views (Connector Views)
* Inline Harness Connector End Views (Diagrams)
Description and Operation
* Transmission General Description (Transmission General Description)
* Transmission Component and System Description (Transmission Component and System Description)
* Electronic Component Description (Electronic Component Description)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Inspect the transmission fluid level. Refer to Transmission Fluid Level and Condition Check (Transmission Fluid Level and Condition Check).
2. Perform a road test. Refer to Road Test (Initial Inspection and Diagnostic Overview).
3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed on the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the X175 harness connector at the transmission.
2. Ignition ON, engine OFF, connect a 3A fused jumper wire between the TFT signal circuit terminal pin G and the TFT low reference circuit terminal H. Verify with a scan tool that the Trans. Fluid Temp. parameter changes from -40°C (-40°F) to 160°C (320°F) when the jumper is installed.
• If not the specified value, test the TFT sensor signal and low reference circuits for a short to voltage, short to ground or an open/high resistance. If circuits test normal, replace the TCM.
3. Ignition OFF, remove the transmission oil pan. Refer to Oil Pan Replacement (Service and Repair).
4. Test the transmission internal harness TFT signal and low reference circuits for a short to voltage, short to ground or an open/high resistance.
• If circuits test normal, test or replace the pressure switch manifold, with thermistor.
Component Testing
Static Testing
Note: You must perform the Circuit/System Testing first.
1. Ignition OFF, remove the pressure switch manifold from the valve body. Refer to Pressure Switch Manifold Replacement (Service and Repair).
2. Test for resistance between the signal circuit terminal E, and the low reference circuit terminal F. See transmission fluid temperature sensor table, refer to Temperature Versus Resistance (Transmission Fluid Temperature Sensor) (Temperature Versus Resistance (Transmission Fluid Temperature Sensor))Temperature Versus Resistance (Speed Sensor) (Temperature Versus Resistance (Speed Sensor))Temperature Versus Resistance (Solenoid) (Temperature Versus Resistance (Solenoid)).
• If not within the specified range, replace the pressure switch manifold, with thermistor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Wiring Harness Replacement (Service and Repair)
* Pressure Switch Manifold Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for TCM replacement, setup, and programming
Repair Verification
If another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle) and perform the appropriate diagnostic procedure.