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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 757 (Data Link Communications System) >> Diagnostic Information and Procedures >> DTC U1000 and U1255: Class 2 Communication Malfunction >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2003 Pontiac Montana, 2003 Oldsmobile Silhouette, and 2003 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.

When a malfunction, such as an open fuse to a module, occurs while modules are communicating, a Lost Communication DTC is set as a current DTC. When the modules stop communicating the current Lost Communication DTC is cleared but the history DTC remains. When the modules begin to communicate again. When the modules begin to communicate again, the module with the open fuse will not be learned by the other modules so DTC U1000 or U1255 is set current by the other modules. If the malfunction occurs when the modules are not communicating, only DTC U1000 or U1255 is set.

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