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Home >> Cadillac >> 2005 >> Escalade ESV >> Repair and Diagnosis >> External Pages >> Different car >> Section 144 (Automatic Transmission - 4L80-E/4L85-E Diagnosis (DTC P0218 To P2771)) >> Diagnostic Information and Procedures >> DTC P0751 >> Test Description

Test Description

WARNING: This page is about a different car, the 2005 GMC Yukon XL, 2005 Chevrolet Suburban, and 2005 Chevrolet Avalanche. 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. 2:  This step tests that the PCM commanded all shifts, that all shift solenoid valves responded correctly, but that all the shifts did not occur.
DTC P0751

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 in Vehicle DTC Information
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 PCM.
  3. Record the DTC Freeze Frame and Failure Records.
  4. Clear the DTC.
  5. Drive the vehicle in D4 range, accelerating the vehicle, ensuring that the PCM commands 1st, 2nd, 3rd and 4th gears.
Did you detect a 2-2-3-3 shift pattern?		 - Go to Step 3  Go to Intermittent Conditions in Engine Controls - 6.0L or Intermittent Conditions in Engine Controls - 8.1L
3
  1. Inspect the shift solenoid/hydraulic circuit for the following conditions:
  2. Clean and inspect the related valves, bores and the valve body for debris or contamination restricting valve movement. Refer to Control Valve Body Cleaning and Inspection in Automatic Transmission - 4L80-E/4L85-E - Overhaul.
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, holding the throttle at 40% and accelerating to 89 km/h (55 mph), only if traffic and road conditions permit.
  4. Select Specific DTC.
  5. Enter DTC P0751.

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 in Vehicle DTC Information System OK
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