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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1049 (Automatic Transmission - ALLISON - DTC P0218 To DTC P0732) >> DTC P0729 >> Circuit Description

Circuit Description

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The transmission control module (TCM) uses input from the input speed sensor (ISS) and the output speed sensor (OSS) to determine gear ratios. The TCM then compares the known gear ratio to the calculated gear ratio for the current range.

DTC P0729 is a type A DTC.