P0804 HUMMER – Skip Shift Lamp Control Circuit

P0804 HUMMER Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P0804 HUMMER Possible Causes

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

P0804 HUMMER 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).