Instrument Panel Cluster (IPC) Description and Operation: Speedometer

The instrument panel cluster (IPC) displays the vehicle speed based on Class 2 information from the powertrain control module (PCM) or the engine control module (ECM) or the Anti-lock Brake System (ABS) module. If the vehicle is equipped with ABS the speedometer defaults to 0 mph (0 km/h) or last known state if a malfunction in communication exists.