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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 233 (Automatic Transaxle - 4T65-E - DTC P0751 To DTC P1823 - 3.5L) >> DTC P0756 (3.5L) >> Test Description

Test Description

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

  1. 3:  This step confirms that the PCM commanded all the shifts, but all the shifts did not occur.
DTC P0756 (3.5L)

Step Action Value(s) Yes No
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 Did you perform the Transmission Fluid Checking Procedure? - Go to Step 3  Go to Transmission Fluid Checking Procedure
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 Freeze Frame and Failure Records for reference. Using the Clear DTC Information function will erase the stored Freeze Frame and Failure Records from the PCM.
  3. Record the Freeze Frame and Failure Records.
  4. Clear the DTCs.
    5. NOTE: Do not operate the transmission continuously in an incorrect gear ratio. Internal transmission component damage may occur.
  5. Accelerate the vehicle in D4 range, ensuring that the PCM commands 1st, 2nd, 3rd and 4th gears.
  6. With the scan tool, observe Commanded Gear and Gear Ratio for each gear.
Did the gear ratios indicate a 4-3-3-4 shift pattern?		 1st: 2.87:1 to 2.97:1
2nd: 1.52:1 to 1.62:1
3rd: 0.95:1 to 1.05:1
4th: 0.65:1 to 0.75:1		 Go to Step 4  Go to Diagnostic Aids
4 Inspect the 2-3 shift solenoid valve/hydraulic circuit for the following conditions:
  • The 2-3 shift solenoid mechanically stuck OFF
  • A stuck or binding 2-3 shift valve
  • Damaged seals on the shift solenoid valve

Refer to:
Did you find and correct the condition?		 - Go to Step 5  -
5 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear DTC Information.
  3. Operate the vehicle under the following conditions:
    • Drive the vehicle in D4.
    • The transmission fluid temperature is between 20°C (68°F) and 130°C (266°F).
    • TP angle must be 10 percent or greater.
    • The engine torque is 27-270N.m (20-200 lb ft).
    • Ensure that the gear ratios are as specified for 1st and 2nd gear.
  4. Select Specific DTC.
  5. Enter DTC P0756.

Has the test run and passed?		 1st: 2.87:1 to 2.97:1
2nd: 1.52:1 to 1.62:1
3rd: 0.95:1 to 1.05:1
4th: 0.65:1 to 0.75:1		 Go to Step 6  Go to Step 2 
6 With a 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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