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 MANUALSCHEVROLET2002MONTE CARLO LSREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESDATA LINK COMMUNICATION SYSTEM
2002 Chevrolet Monte Carlo LS
Data Link Communication System
2002 Chevrolet Monte Carlo LSSECTION Data Link Communication System
- Specifications
- Schematic & Routing Diagrams
- Component Locator
- Diagnostic Information & Procedures
- Diagnostic Starting Point - Data Link Communications
- Diagnostic Trouble Code (DTC) List
- DTC U1000 & U1255: Critical Operating Parameter Has Not Been Associated
- DTC U1001 to U1254: Module U1XXX Communication
- DTC U1300, U1301 OR U1305 (GENERIC SHORT DTC): Class 2 Serial Data Circuit
- Scan Tool Does Not Power Up
- Scan Tool Does Not Communicate With Class 2 Device
- Repair Instructions
- Description & 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.