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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 30 (AUTOMATIC TRANSMISSION - ALLISON - DIAGNOSTICS (DTCs P0732-P0877)) >> DTC P0741 >> Test Description

Test Description

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

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

  1. 2:  This step tests ignition voltage.
  2. 3:  This step tests for TCC enable status.
DTC P0741

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. Start the engine.
    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, measure ignition voltage.
Is the voltage within the specified range?		 9-18 V Go to Step 3  Go to DTC P0562 for low voltage or DTC P0563 for high voltage
3
  1. Drive the vehicle under normal operating conditions.
  2. Using the scan tool, monitor converter slip speed indicated when a range is attained where the TCC should be applied.
Is the slip speed value at or greater than the specified value when the TCC should be applied?		 80 RPM Go to Step 4  Go to Diagnostic Aids 
4 This condition indicates the TCC is mechanically stuck OFF. Inspect for the following conditions:
  • Worn TCC clutch
  • Faulty TCC solenoid
  • Debris in the TCC valve bore
  • Clogged converter relief passage

Did you find and repair a condition?		 - Go to Step 5  -
5 Perform the following procedure in order to verify the repair:
  1. Clear the DTC.
  2. Start the engine.
  3. Using the scan tool, operate the vehicle under normal operating conditions.
  4. Select Specific DTC.
  5. Enter DTC P0741.

Has the test run and passed?		 - Go to Step 6  Go to Step 2 
6 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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