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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Automatic Transmission - 4L80-E/4L85-E (Service & Replacement)) >> Diagnostic Information and Procedures >> DTC P0748: PC Duty Cycle >> Test Description

Test Description

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

  1. 2. This step tests the ability of the PCM to command the PC solenoid valve.
  2. 3. This step tests the PC solenoid valve and the AT wiring harness assembly for incorrect resistance.
Fig 1: DTC P0748 (1 Of 3)
G02424368Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC P0748 (2 Of 3)
G02424369Courtesy of GENERAL MOTORS CORP.
Fig 3: DTC P0748 (3 Of 3)
G02424370Courtesy of GENERAL MOTORS CORP.
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