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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Diagnosis - A/T >> Service Bulletins >> Checking Self-Diagnostic System

Checking Self-Diagnostic System

Checking self-diagnostic system for trouble codes can help in diagnosing lock-up and/or no lock-up conditions. For testing procedures, see appropriate TESTING & DIAGNOSIS section.