Note On Intermittents

Manipulate VSS wiring and connectors, and ensure wiring is not close to spark plug wires. Code can be caused by an open, short to ground or short to voltage on circuit No. 400 or 401. Also, check for an open or shorted sensor connector, engine-to-dash connector or PCM connector and a defective sensor. If wiring and connectors are okay, substitute a known good sensor, and retest.

Fig 1: PCM Code E75, Schematic, VSS Signal Interrupt

Courtesy of GENERAL MOTORS CORP.