Possible causes – Faulty Diagnostic Module Tank Leakage (DMTL)– Diagnostic Module Tank Leakage harness is open or shorted– Diagnostic Module Tank Leakage circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1404 HYUNDAI OBD Code Description The heated DMTL (Diagnostic Module Tank Leakage) is used to monitor the evaporative…