Impala V8-5.3L VIN C (2006)
Shift Indicator: Description and Operation
PRNDL DISPLAY
The IPC displays the selected gear position as determined by the ECM/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.
