Silverado 1500 4WD V8-5.3L VIN Z Flex Fuel (2005)
Shift Indicator: Description and Operation
SHIFT INDICATOR
The instrument panel cluster (IPC) illuminates the shift indicator when the powertrain control module (PCM) determines that the vehicle should be
shifted to the next higher gear. The IPC receives a class 2 message from the PCM requesting illumination.
