Note On Intermittents

Manipulate affected wiring while engine is running. If fault is induced, code will set. Check or repair circuit for intermittent open or short to ground. Disconnect and reconnect power steering connector and PCM connector, ensuring they are latched.

Fig 1: Code P040 Schematic (DeVille)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code P040 Flow Chart (DeVille)

Courtesy of GENERAL MOTORS CORP.