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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 33 (AUTOMATIC TRANSMISSION - ALLISON - DIAGNOSTICS (DTCs P0878-P2723)) >> DTC P1688 >> Circuit Description

Circuit Description

WARNING: This page is about a different variant/trim than selected.

Vehicles currently using the 8.1 liter gas engine use a 3 wire system to communicate engine torque data/requests between the engine control module (ECM) and the transmission control module (TCM).

DTC P1688 is a type B DTC.

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