Impala V6-3.8L SC VIN 1 (2005)
Tachometer: Description and Operation
TACHOMETER
The IPC displays the engine speed as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the engine speed. The
tachometer will default to 0 rpm if:
-
The PCM detects a malfunction in the engine speed sensor circuit.
-
The IPC detects a loss of class 2 communications with the PCM.
