Problem with the vehicles EVAP system, this can also trigger the gas cap...signal. There is a leak to atmosphere in the system, have it read for DTC's
When filling gas tank stop when it clicks the first time. Test & or replace EVAP purge valve, if your EVAP canister has a replaceable filter media replace it otherwise replace the cannister. Check for cracks is hoses or loose hoses to the gas tank and fuel filler neck and purge valve and the rest of the EVAP system (it goes to the motor).
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