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In the 2003 Chevy Silverado, the primary computer is called the "BCM" or 'Body Control Module". It manages the truck's electronic control modules (ECMs), such as power windows, locks, instrument panel, and lights. The BCM is usually located under the steering column behind the driver's knee panel, accessible from under the dash. When it's time to replace the body control module, indications may include issues like instrument cluster failure or flickering interior lights. Symptoms like chime warnings, dome lights going on and off, erratic speedometer, radio malfunctions, and intermittent power door locks or windows may also suggest a faulty BCM. The cost to replace the BCM typically falls within the $530 to $560 range for both parts and labor.
The body control module on a 2003 Chevy Silverado can be found tucked away behind the dashboard.