How to Get Fault Codes for Blue Bird Buses With Cummins Engines

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Blue Bird buses equipped with Cummins diesel engines contain an engine control module, or ECM, that continuously monitors the vehicle for problems. When the ECM detects a problem with one or more of the bus's systems, it stores a diagnostic trouble code, or DTC, in its internal memory. These DTCs are alphanumeric codes that correspond to a specific problem within the vehicle. An automotive scan tool connected to the bus's diagnostic data port can retrieve the codes from the ECM's memory.

Things You'll Need

  • Automotive scan tool
  • Turn off the engine and apply the parking brake. Turn the ignition back to the "ON" position, but don't crank or restart the engine.

  • Plug an automotive scan tool's data cable into the bus's data port, located underneath the dashboard near the steering column.

  • Press the power button on the scan tool and allow it to boot up. Select "ECM" from the scan tool's main menu.

  • Select "Read all stored DTCs" from the ECM menu. Write down the DTCs shown on the scan tool's screen.

Tips & Warnings

  • An automotive scan tool is a hand-held, computerized device that connects to vehicles in order to communicate with their computers. Scan tools are available from auto parts stores and automotive tool retailers, including online tool websites.

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