Test Description

WARNING: This page is about a different variant/trim than selected.

NOTE: Test numbers refer to numbers on diagnostic chart.

Disable TC system (if equipped) when performing this step. Whenever ignition is cycled to off position and then back to on, TC system will default on. An intermittent connection at VSS or PCM may cause code to set. Inspect harness and all related connections. Check for damage or pushed out terminals. Prior to replacing PCM, check for correct software calibration (reprogrammable).

Fig 1: Code 72 Schematic (Corvette) Vehicle Speed Sensor Loss

Fig 2: Code 72 Diagnostic Flow Chart (Corvette) Vehicle Speed Sensor Loss