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 MANUALSCHEVROLET2003VENTURE BASE, VAN CARGO EXTENDEDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESDATA LINK COMMUNICATIONS SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC U1001 TO U1254: LOST COMMUNICATION WITH U1XXX MODULECONDITIONS FOR RUNNING THE DTC
2003 Chevrolet Venture Base, Van Cargo Extended
Conditions for Running the DTC
2003 Chevrolet Venture Base, Van Cargo ExtendedSECTION Conditions for Running the DTC
- Voltage supplied to the module is in the normal operating voltage range, approximately 9 - 16 volts.
- A short to ground or B+ is not present. Diagnostic trouble codes U1300 and U1301 and U1305 are not set.
- The vehicle power mode requires serial data communication to occur.
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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.