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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1737 (Automatic Transmission - ALLISON - DTC P0218 To DTC P0878) >> DTC P0729 or P0731-P0736 >> Conditions for Setting the DTC >> P0729

Conditions for Setting the DTC: P0729

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The TCM detects the calculated gear ratio with 6th gear commanded differs from the known 6th gear ratio for 2 seconds or longer.

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