PRNDL Display

The instrument panel cluster (IPC) displays the selected gear position as determined by the engine control module (ECM)/powertrain control module (PCM). The IPC receives a GMLAN message from the ECM/PCM indicating the gear position. The PRNDL display blanks if:

• The ECM/PCM detects a malfunction in the transmission range switch circuit.
• The IPC detects a loss of GMLAN communications with the ECM/PCM.
• The IPC detects a loss of GMLAN communications with the body control module (BCM).