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Circuit Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Do not perform this check if no driveability concern exists.

The Diagnostic System Check - Manual Transmission is an organized approach to identifying a condition created by an electronic engine control system malfunction. This directs the service technician to the next logical step in order to diagnose the concern. Understanding the table and using it correctly will reduce diagnostic time, and will prevent the replacement of good parts.

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