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Home >> GMC >> 2004 >> Sierra 2500, 4D Pickup, RWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Data Link Communication System >> Diagnostic Information and Procedures >> DTC U1881 To U1899: Starter/Generator Control Module Lost Communication With Engine Control Module (ECM)/Powertrain Control Module (PCM) >> Circuit Description

Circuit Description

Modules connected to the class 2 and high speed GMLAN serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. All DTCs in this range are reported on class 2 link to the scan tool by powertrain control module (PCM) even if they may be set by different modules.

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