Tech Tip: BMW no start, bad CAS module

    Sept. 8, 2017

    Vehicle: 2008 BMW 335xi, AWD (E90), L6-3.0L Turbo (N54), Automatic Transmission

    Mileage: 118,669

    Problem: When trying to start the engine, the starter momentarily engaged then stopped.

    Details: The tech found that, while attempting to crank/start the engine, the starter solenoid was only powered for a split second. He connected a scan tool and retrieved an A0C1 (Output Terminal 50) diagnostic trouble code.

    The ALLDATA Tech-Assist consultant suggested he open the Car Access System (CAS) module to inspect for signs of burned spots on the circuit board.

    Confirmed Repair: When the tech opened the CAS module, he found several burned circuits. He replaced the CAS module. After the repair, the engine started and ran normally.

    Information provided by: ALLDATA

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