Malibu V6-3.5L VIN 8 (2004)
Tachometer: Description and Operation
TACHOMETER
The instrument panel cluster (IPC) displays the engine speed as determined by the powertrain control module (PCM). The IPC receives a GMLAN
message from the body control module (BCM) indicating the engine speed. The tachometer will default to 0 RPM if:
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The PCM detects a malfunction in the engine speed sensor circuit.
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The IPC detects a loss of GMLAN communications with the BCM.
