PRNDL Indicator

The PRNDL indicator shows the gear selection for an automatic transmission (AT). The PRNDL indicator receives coded input through four wires from the transmission range (TR) selector (part of the park/neutral position (PNP) switch).

A gear selection light emitting diode (LED), for example Reverse (Rev), illuminates depending on which combination of the four wires to the PRNDL indicator are grounded.

The indications are separate from the transmission's inputs to the vehicle control module (VCM) (Gasoline) or the powertrain control module (PCM) (Diesel).