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2003 Cadillac CTS

Question: gas cap replacement

Question

Varnessa, 3.2L V6, Woodinville, WA, February 19, 2011, 15:49
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 Rookie

why do i keep getting a check gas cap message

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  • Answer #1

    ZeeTech February 19, 2011, 15:59
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     Master

    There might be an EVAP system leak which mostly caused by loose gas cap.
    There could be a leak somewhere else on the system, also a bad fuel tank pressure sensor.
    This problem should turn on the Check Engine Light also. If the cap is tight you will need to get a computer diagnostic.

    Zee

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