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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 169 (Body Control Modules) >> Diagnostic Tests >> DTC U1000 & U1255: Class 2 Communication Malfunction >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

When a malfunction (such as a blown fuse to a module) occurs while modules are communicating, a lost communication DTC (U1001-1254) will store as current. When modules stop communicating (ignition OFF), current lost communication DTC will be cleared and a history DTC will remain. When modules begin to communicate again, module with blown fuse will not be learned by other modules so DTC U1000 or U1255 will be set as current by other modules. If malfunction occurs when modules are not communicating, only U1000 or U1255 will be set.

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