BMW 325i no crank no start issue with CAS module failure code A0B4 on BMW 325i

Some BMW 325i owners report experiencing a no crank, no start issue accompanied by a CAS module failure code A0B4. This error code indicates problems with the starter operation signal, which can prevent the engine from cranking or starting. Owners are advised to inspect the CAS module for signs of failure, such as burnt components on the circuit board, which may necessitate further repair. Additionally, troubleshooting should include verifying the voltage and amperage in the CAS live data during engine cranking, as this can yield valuable diagnostic insights. Even after replacing the battery, some owners find that further investigation into the CAS module or associated wiring is required to resolve the issue effectively.