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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 4L60-E/4L65-E (Service & Replacement) >> Diagnostic Information and Procedures >> Diagnostic System Check - Automatic Transmission >> Circuit Description

Circuit Description

The Automatic Transmission Diagnostic System Check is an organized approach to identify a problem created by an automatic transmission. The DIAGNOSTIC SYSTEM CHECK -- ENGINE CONTROLS in Engine Controls is the diagnostic starting point for an automatic transmission complaint. The DIAGNOSTIC SYSTEM CHECK -- ENGINE CONTROLS in Engine Controls directs you to the next logical step for diagnosing a transmission concern. Perform this check only if there is a driveability complaint or if you have been directed here from another service information section.

Follow the table to help reduce diagnostic time and help prevent unnecessary replacement of good parts.

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