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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 220 (Automatic Transaxle Diagnosis - 4T65-E) >> Diagnostic Tests >> DTC P0502: Vehicle Speed Sensor Circuit (Low Input) >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. 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. 3  - This step tests the ability of the VSS to produce an AC voltage. This step also verifies the integrity of the wiring to the PCM.
  2. 4  - This step tests the VSS circuit for correct resistance.

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