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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1737 (Automatic Transmission - ALLISON - DTC P0218 To DTC P0878) >> DTC P0776 or P0777 >> Conditions for Setting the DTC >> P0776

Conditions for Setting the DTC: P0776

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The TCM detects that the calculated commanded gear ratio differs from the known commanded gear ratio for 2 seconds after a shift is commanded.