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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 72 (Automatic Transmission Diagnosis - 4L80-E (Diesel)) >> Diagnostic Tests >> DTC P0748: Pc Solenoid Circuit - Electrical Malfunction >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 GMC Cab & Chassis Sierra and 2002 Chevrolet Cab & Chassis 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 correct resistance.

  3. 6

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

  4. 10

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

  5. 15

    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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