Note On INTERMITTENTS

If code sets when an accessory is operated, check for poor connections or excessive current draw. Also, check for poor connections at starter solenoid or fusible link. Minimum voltage allowed for Code 75 to set is on a graduated scale and changes with temperature. Minimum voltage at -40°F (-40°C) is 6.7 volts. Minimum voltage at 304°F (150°C) is 10.5 volts, and minimum voltage at 194°F (90°C) is 8.6 volts.

Fig 1: CODE 75, Schematic, System Voltage Low

Courtesy of GENERAL MOTORS CORP.

Fig 2: CODE 75, Flowchart, System Voltage Low

Courtesy of GENERAL MOTORS CORP.