Some info about Accelerator Pedal Position Sensors (APPS):
This sensor is used to on your vehicle in place of a traditional throttle cable. Mounted on your gas pedal, it measures the driver's input on the gas pedal.
2003 GMC Sierra 1500 equipped with 6.0L V8 Gas OHV, 5.3L V8 Gas OHV, 5.3L V8 Flex OHV, 4.8L V8 Gas OHV, 4.3L V6 Gas OHV
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Accelerator Pedal Sensor Obsolete with Fixed Pedals
2003 GMC Sierra 1500 equipped with 6.0L V8 Gas OHV, 5.3L V8 Gas OHV, 5.3L V8 Flex OHV, 4.8L V8 Gas OHV, 4.3L V6 Gas OHV
Accelerator Pedal Sensor Obsolete with Fixed Pedals