Possible causes

– Faulty Skip Shift Lamp
– Skip Shift Lamp harness is open or shorted
– Skip Shift Lamp circuit poor electrical connection

When is the code detected?

When the Powertrain Control Module (PCM) commands the control circuit to a component OFF, the voltage potential of the circuit should be high (near battery voltage). If the fault detection circuit senses a voltage other than what is expected, the fault line status changes causing theP0804 code is set.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P0804 SATURN Description

An ignition voltage is supplied to the Skip Shift Lamp. The Powertrain Control Module (PCM) controls the lamp by grounding the control circuit via an internal switch called a driver. The driver supplies the ground for the component being controlled. Each driver has a fault line which the PCM monitors. When the PCM commands a component ON, the voltage of the control circuit should be low (near 0 volts).