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While some users have mentioned that the "code 4" on the Chevrolet Cruze may relate to a temperature sensor problem, I did not come across any supporting information in my research. It seems like you may be referring to a DIC code rather than a DTC code. In American models of the Cruze, you should see a text display of the problem. If you are talking about the DTC code P0004 instead, it indicates that the engine control module is having trouble receiving signals from the fuel shut-off system. This suggests issues with the fuel-rail mounted volume regulator control, which can pose significant risks. If this applies to your situation, it's crucial to have it inspected promptly.
The "code 4" displayed on the dashboard indicates a problem with the temperature sensor.