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Head Up Display (HUD) Description and Operation: Speedometer

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The speedometer is shown on the head-up display (HUD) as a 3-digit display. The HUD speedometer is capable of displaying up to 120 mph. The HUD receives a class 2 message from the engine control module (ECM) or the powertrain control module (PCM) indicating vehicle speed. If the class 2 message from the ECM/PCM is invalid the HUD will use a class 2 message from the electronic brake control module (EBCM) instead.

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