Section 379 (Data Link Communication System)
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.
- Specifications
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Starting Point - Data Link Communications
- Diagnostic Trouble Code (DTC) List
- DTC U0073: High Speed CAN Communication Bus
- DTC U0100 To U0299 (Diesel Engine): Lost Communication With U0XXX Module
- DTC U0100 To U0299 (HP2): Lost Communication With U0XXX Module
- DTC U1000: Class 2 Data Link
- DTC U1001 To U1254: Loss of U1XXX Communications
- DTC U1300, U1301, or U1305: Class 2 Data Link Shorted
- DTC U1800, U2105, U2106, or U2108: Lost Communications
- DTC U1881 To U1899: Starter/Generator Control Module Lost Communication With Engine Control Module (ECM)/Powertrain Control Module (PCM)
- DTC U2104: Controller Area Network (CAN) Bus Reset Counter Overrun
- Symptoms - Data Link Communications
- Scan Tool Does Not Power Up
- Scan Tool Does Not Communicate with Class 2 Device
- Scan Tool Does Not Communicate with High Speed GMLAN Device
- Data Link References
- Repair Instructions
- Description and Operation