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Test Description

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2:  This step verifies DTC P0712 by indicating a short to ground. If the scan tool does not display a transmission fluid temperature greater than 150°C (302°F), then the DTC is intermittent.
  2. 3:  This step isolates the transmission. If the scan tool displays a transmission fluid temperature less than -38°C (-36°F), then the engine wiring harness is good.
DTC P0712

Step Action Values Yes No
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
    3. IMPORTANT: Before clearing the DTC, use the scan tool in order to record the Failure Records. Using the Clear Info function erases the Failure Records from the TCM.
  3. Record the DTC Failure Records.
  4. Clear the DTC.
  5. Select Trans. Fluid Temp. on scan tool.
Does the scan tool display a Trans. Fluid Temp. less than the specified value?		 150°C (302°F) Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the AT inline 20-way connector. Additional DTCs may set.
  3. Turn ON the ignition, with the engine OFF.
Does the scan tool display a Trans. Fluid Temp. less than the specified value?		 -39°C (-38°F) Go to Step 5  Go to Step 4 
4 Test the signal circuit of the TFT sensor for a short to ground between the TCM connector and the AT inline 20-way connector.
Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 11  Go to Step 10 
5
  1. Install the J 44152  Jumper Harness (20 pins) on the transmission side of the AT inline 20-way connector. See Special Tools .
  2. Using the DMM and the J 35616  GM Terminal Test Kit, measure the resistance between terminals L and M of the J 44152  . See Special Tools .

    Refer to Automatic Transmission Inline 20-Way Connector End View .

Does the resistance measure within the range specified for the given transmission temperatures?		 20°C (68°F)
2981-4,018 Ω
80°C (176°F)
293-372 Ω		 Go to Step 6  Go to Step 7 
6 Measure the resistance between terminal L of the J 44152  and ground. See Special Tools .
Refer to Automatic Transmission Inline 20-Way Connector End View .
Does the resistance measure less than the specified value?		 100 Ω Go to Step 9  Go to Testing for Intermittent Conditions and Poor Connections
7
  1. Disconnect the TFT sensor from the automatic transmission wiring harness.
  2. Measure the resistance between terminal L and all other terminals of the J 44152  . See Special Tools .

    Refer to Automatic Transmission Inline 20-Way Connector End View .

Does the resistance measure between terminal L and any other terminal less than the specified value?		 100 Ω Go to Step 9  Go to Step 8 
8 Replace the TFT sensor.
Refer to Upper Control Valve Body Disassemble .
Did you complete the replacement?		 - Go to Step 11  -
9
IMPORTANT: The automatic transmission wiring harness consists of 2 separate harnesses, the Automatic Transmission Wiring Harness Assembly and the Automatic Transmission Wiring Extension Harness Assembly. In order to avoid the unnecessary replacement of parts, only replace the Automatic Transmission Wiring Harness Assembly.
Replace the automatic transmission wiring harness.Refer to Input Speed Sensor and Wiring Harness Removal .Did you complete the replacement?		 - Go to Step 11  -
10 Replace the TCM.
Refer to Control Module References .
Did you complete the replacement?		 - Go to Step 11  -
11 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:
    • Turn ON the ignition, with the engine OFF.
    • The Trans. Fluid Temp. must be 144°C (291°F) or less for 10 seconds.
  4. Select Specific DTC.
  5. Enter DTC P0712.

Has the test run and passed?		 - Go to Step 12  Go to Step 2 
12 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 System OK
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