Two or more devices on a bus cannot have the same address. If two devices on the same bus have the same address, performance can degrade or serious communication problems can occur, including devices not coming online and the cessation of all communications on the bus.
Check for duplicate addresses in the following ways, depending on the severity of the situation:
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If bus performance is degraded, check the address switch settings at the devices with unreliable communications.
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If the bus communications problems are severe, and there is no communication or you cannot determine where communication is unreliable, partition (disconnect and isolate a portion of the bus for testing purposes) and test the bus portion connected to the engine (or MAP for newer devices).