Lucerne V6-3.8L VIN 2 (2006)
Shift Indicator: Description and Operation
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:
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The ECM/PCM detects a malfunction in the transmission range switch circuit.
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The IPC detects a loss of GMLAN communications with the ECM/PCM.
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The IPC detects a loss of GMLAN communications with the body control module (BCM).
