Section 726 (Data Link Communication System)
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 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 U1000 and U1255: Node Alive Message Has Not Been Received From An Unidentified Module
- DTC U1001-U1254: Module U1XXX Communication
- DTC U1300, U1301, or U1305: No Valid Messages Are Detected On The Class 2 Serial Data Circuit
- Symptoms-Data Link Communications
- Scan Tool Does Not Power Up
- Scan Tool Does Not Communicate with Class 2 Device
- Repair Instructions
- Description and Operation