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Circuit Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

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

DTC P1688 is a type B DTC.

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