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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 62 (Automatic Transmission Diagnosis - 4L80-E) >> Diagnostic Tests >> DTC P0748: Pc Solenoid Circuit - Electrical Malfunction >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 GMC Sierra, 2002 Chevrolet Suburban, and 2002 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers listed below refer to step numbers in the diagnostic procedure:

  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 transmission internal wiring harness assembly for incorrect resistance.

  3. 6

    This step tests the PC solenoid valve and the internal wiring harness for a short to ground.

  4. 9

    This step tests the entire PC solenoid valve circuit up to the PCM for continuity.

  5. 10

    This step tests for a short to ground in the PC solenoid valve high control circuit (1228) and the PC solenoid valve low control circuit (1229) of the engine harness.

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