GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Chevy K Silverado - 4WD 🢒 Restraints 🢒 SIR 🢒 DTC P0711

Object Number: 1558669 Size: LF
Master Electrical Component List
Automatic Transmission Controls Schematics
OBD II Symbol Description Notice
Control Module References

Circuit Description

The automatic transmission fluid temperature (TFT) sensor is part of the 4L80-E automatic transmission (AT) wiring harness assembly. The 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. The PCM uses this information to control shift quality and torque converter clutch apply.

If the PCM detects the TFT sensor resistance has no change, intermittent, or an unrealistic change in a short amount of time, multiple changes within seconds, then DTC P0711 sets. DTC P0711 is a type C DTC.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0711 Transmission Fluid Temperature (TFT) Sensor Performance

Conditions for Running the DTC
    • No ECT DTC P0117 or P0118.
    • No OSS DTC P0502 or P0503.
    • No AT ISS DTC P0716 or P0717.
    • No component slipping DTC P0894.
    • System voltage is between 8-18 volts for more than 5 seconds.
    • The engine is running for greater than 35 seconds.
    • The TFT is -40 to +21°C (-40 to +70°F) at start up.
    • The ECT is greater than 85°C (185°F).
    • The ECT has changed at least 55°C (99°F) since start up.
    • The vehicle speed is greater than 8 km/h (5 mph) for at least 750 seconds (12.5 minutes) cumulatively.
    • The torque converter clutch (TCC) slip speed is greater than 60 RPM for at least 500 seconds (8.3 minutes) cumulatively.

Conditions for Setting the DTC

One of the following conditions occurs:

Condition 1

The TFT has not changed more than 2.25°C (4°F), in more than 80 seconds.

Condition 2

The TFT has an unrealistic temperature change of more than 20°C (36°F) 14 times in 7 seconds.

Action Taken When the DTC Sets
    • The PCM does not illuminates the malfunction indicator lamp (MIL).
    • The PCM commands increased line pressure.
    • The PCM freezes shift adapts.
    • The PCM determines default transmission fluid temperature using the following conditions:
       - If the engine run time is less than 60 seconds then default TFT equals 47°C (117°F).
       - If ECT is less than 20°C (68°F), then default TFT equals IAT.
       - If the ECT is 20-110°C (68-230°F) then default TFT equals ECT.
       - If the ECT is greater than 110°C (230°F) then default TFT is set to 140°C (284°F) and transmission shift pattern is in hot mode.
       - If ECT and TFT DTCs are both set then default TFT is 140°C (284°F).
    • The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Failure Records.
    • The PCM stores DTC P0711 in PCM history.

Conditions for Clearing the DTC
    • A scan tool clears the DTC from PCM history.
    • The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without a non-emission related diagnostic fault occurring.
    • The PCM cancels the DTC default actions when the fault no longer exists and the ignition switch is OFF long enough in order to power down the PCM.

Diagnostic Aids
    • DTC P0218 may set approximately 600 seconds (10 minutes) after DTC P0711 has set. Follow the diagnostic table for DTC P0711 before proceeding to the diagnostic table for DTC P0218.
    • DTC P0711 defaults to an elevated line pressure condition which may result in partial TCC apply. This may produce an idle surge that could stall the engine.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step tests for proper AT fluid level and condition.

    2.

  2. This step verifies which condition has set DTC P0711.

    3.

  3. The 12-volt test lamp is used as a fixed resistance.

    4.

  4. This step ensures that the PCM monitors the TFT sensor signal circuit.

Step

Action

Yes

No

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

Perform the Transmission Fluid Checking Procedure. Refer to Transmission Fluid Check .

Did you perform the Transmission Fluid Checking Procedure?

Go to Step 3

Go to Transmission Fluid Check

3

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.

    3. Important: Before clearing the DTCs, use the scan tool in order to record the Failure Records. Using the Clear Info function erases the Failure Records from the PCM.

  3. Record the Failure Records.
  4. Clear the DTCs.
  5. Select transmission fluid temperature on the scan tool.
  6. Drive the vehicle and observe the scan tool for one of the following conditions:
    7. • No transmission temperature change
    • An unrealistic transmission temperature change of greater than 20°C (36°F) 14 times in 7 seconds

Did either of the fail conditions occur?

Go to Step 4

Go to Intermittent Conditions in Engine Controls - 6.0L

4

Did the scan tool display an unrealistic temperature change?

Go to Step 5

Go to Step 6

5

  1. Turn OFF the ignition.
  2. Disconnect the transmission 20-way connector. Additional DTCs may set.
  3. Using the J 35616 GM terminal test kit, install a 12-volt test lamp between the TFT sensor signal circuit and the low reference circuit on the engine side of the transmission 20-way connector.
  4. Turn ON the ignition, with the engine OFF.
  5. While observing the scan tool display, move or wiggle the engine wiring harness from PCM connector C2 to the AT inline 20-way connector.

Does the scan tool display an unrealistic transmission temperature change?

Go to Step 7

Go to Step 8

6

  1. Record the scan tool transmission fluid temperature display from Step 4.
  2. Turn OFF the ignition.
  3. Disconnect the transmission 20-way connector. Additional DTCs may set.
  4. Turn ON the ignition, with the engine OFF.

Is the scan tool TFT the same as in Step 4?

Go to Step 11

Go to Step 10

7
  1. Test the signal circuit of the TFT sensor for an intermittent open or short condition between the PCM connector C2 and the AT inline 20-way connector.
  2. Test the low reference circuit of the TFT sensor for an intermittent open or short condition between the PCM connector C2 and the AT inline 20-way connector.

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct a condition?

Go to Step 12

Go to Step 11

8
  1. Test the signal circuit of the TFT sensor for an intermittent open or short condition between the AT inline 20-way connector and the transmission fluid pressure (TFP) manual valve position switch.
  2. Test the low reference circuit of the TFT sensor for an intermittent open or short condition between the AT inline 20-way connector and the TFP manual valve position switch.

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find a condition?

Go to Step 9

Go to Step 10

9

Replace the automatic transmission wiring harness. Refer to Valve Body and Pressure Switch Replacement .

Did you complete the replacement?

Go to Step 12

--

10

Replace the TFT sensor. The TFT sensor is part of the TFP manual valve position switch. Refer to Valve Body and Pressure Switch Replacement .

Did you complete the replacement?

Go to Step 12

--

11

Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 12

--

12

Perform the following procedure in order to verify the repair:

  1. Select DTC.
  2. Select Clear Info.
  3. Operate the vehicle under the following conditions:
    4. • The transmission fluid temperature changes by more than 3°C (5°F) after the engine has been running for 35 seconds.
    • For a period of at least 11 seconds, the transmission fluid temperature does not change more than 20°C (36°F) within 0.2 second.
  4. Select Specific DTC.
  5. Enter DTC P0711.

Has the test run and passed?

Go to Step 13

Go to Step 2

13

With the scan tool, observe the stored information, capture info and DTC info.

Does the scan tool display any DTCs that you have not diagnosed?

Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information

System OK