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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 142 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - DTC P0218 To DTC P0961) >> DTC P0756 >> Test Description

Test Description

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

  1. 2:  This step tests that the TCM commanded all shifts, that all shift solenoid valves responded correctly, but that all the shifts did not occur.
DTC P0756

Step Action 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 Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the TCM.
  3. Record the DTC Freeze Frame and Failure Records.
  4. Clear the DTC.
  5. Drive the vehicle in D4 range under the following conditions:

    Accelerate the vehicle, ensuring that the TCM commands 1st, 2nd, 3rd, and 4th gears.

Did you detect a 4-3-3-4 shift pattern?		 Go to Step 3  Go to Diagnostic Aids
3
  1. Inspect the shift solenoid/hydraulic circuit for the following conditions:
    • Debris or chips in the AFL oil passage
    • Debris or chips restricting oil flow in passage #29 of the case or through the spacer plate gasket into the valve body
    • A cracked 2-3 shift solenoid
    • A 2-3 shift valve which is stuck or hung up in the valve body bore
    • A 2-3 shuttle valve which is stuck or hung up in its bore
    • Damaged seals on the shift solenoid valves

      Refer to Shift Solenoid Leak Test .

  2. Clean and inspect the related valves, bores and the valve body for debris or contamination.
Did you find and correct the condition?		 Go to Step 4  -
4 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear Info.
  3. Drive the vehicle in D4 range under the following conditions, only if traffic and road conditions permit:

    Hold the throttle at 40 percent and accelerate to 64 km/h (40 mph).

  4. Select Specific DTC.
  5. Enter DTC P0756.

Has the test run and passed?		 Go to Step 5  Go to Step 2 
5 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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