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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 4L60-E/4L65-E (Service & Replacement) >> Diagnostic Information and Procedures >> DTC P0748: PC Solenoid Valve Duty Cycle Has Reached Its High Limit >> Test Description

Test Description

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 automatic transmission (AT) wiring harness assembly for incorrect resistance.
Fig 1: DTC P0748 Diagnosis (Steps 1-6)
G01565715Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC P0748 Diagnosis (Steps 7-16)
G01565716Courtesy of GENERAL MOTORS CORP.
Fig 3: DTC P0748 Diagnosis (Steps 17-20)
G01565717Courtesy of GENERAL MOTORS CORP.
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