Code 72, VSS Circuit Loss Transmission Output Signal: Notes

WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 1995 GMC Vandura Special, 1995 GMC Vandura, 1995 GMC Suburban, 1995 GMC Rally Camper Special, and 1995 GMC Rally. However, it is still accessible from the selected car via links, so may be relevant.

VSS output sensor is a magnetic induction type. Gear teeth pressed on outside diameter of output carrier assembly induce an alternating current in sensor when drive wheels are turning.

NOTE: Test numbers refer to test numbers on diagnostic chart.

Test verifies VSS voltage at control module.
Test checks VSS buffer ground circuit.
Test checks VSS circuit at buffer module.
Test verifies VSS signal at sensor.