Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCADILLAC2011ESCALADE BASE, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 352 (DATA LINK COMMUNICATION SYSTEM)
2011 Cadillac Escalade Base, AWD
Section 352 (Data Link Communication System)
2011 Cadillac Escalade Base, AWDSECTION Section 352 (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
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.