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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 385 (Engine Controls Self-Diagnostics) >> Diagnostic Tests >> DTC P0503: Vehicle Speed Sensor Erratic >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers in the diagnostic procedures.

  1. 2

    Disable the traction control system when performing this step. When the ignition switch is cycled OFF and then back ON, the traction control system defaults to ON.

  2. 3

    This step tests the VSS assembly.

  3. 5

    This step tests the integrity of the VSS assembly.

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