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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1735 (Data Link Communications) >> Diagnostic Information and Procedures >> DTC U2102 or U2103: Controller Count Mismatch >> Conditions for Setting the DTC

Conditions for Setting the DTC

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Each controller on the CAN serial data circuit monitors the activity or traffic on the bus. The module setting the DTC does not receive CAN formatted messages from all of the modules it expected to, or receives too many CAN formatted messages. This indicates that there may be fewer controllers or more controllers actively communicating on the bus than programmed. After the seventh attempt, the module sets on one of the following DTCs:

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