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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 32 (AUTOMATIC TRANSMISSION - ALLISON - DIAGNOSTICS (DTCs P0878-P2723)) >> DTC P0881 >> Test Description

Test Description

WARNING: This page is about a different variant/trim than selected.

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

  1. 3:  This step tests for proper TCM battery direct voltage.
DTC P0881

Step Action Value Yes No
Schematic Reference: Automatic Transmission Controls Schematics
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Install the 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 for reference. The Clear Info function will erase the data.
  3. Record the DTC Freeze Frame and Failure Records.
  4. Clear the DTC.
  5. Using the scan tool, monitor TCM input voltage.
Is voltage within the specified value?		 B+ Go to Diagnostic Aids Go to Step 3 
3
  1. Turn the ignition OFF.
  2. Disconnect the 80-way connector at the TCM.
  3. Install the J 39700  breakout box, the J-47275  breakout box adapter and the J 47275-1 magnetic overlay. See Special Tools .
  4. Use the DMM, and in sequence, measure voltage at connector terminals 10 and 70 and a known good ground.
Is voltage within the specified value?		 B+ Go to Testing for Intermittent Conditions and Poor Connections Go to Step 4 
4 Test the battery positive voltage circuit or the engine control module (ECM) B voltage circuit for loose or corroded connectors.
Did you find and correct a condition?		 - Go to Step 6  Go to Step 5 
5
IMPORTANT: In most cases, the TCM is not at fault. Investigate thoroughly before replacing the TCM.
Replace the TCM. Refer to Control Module References for replacement, setup and programming.Did you complete the replacement?		 - Go to Step 6  -
6 Perform the following procedure in order to verify the repair:
  1. Clear the DTC.
  2. Using the scan tool, monitor TCM voltage.
  3. Select Specific DTC.
  4. Enter DTC P0881.

Has the test run and passed?		 - Go to Step 7  Go to Step 2 
7 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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