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The CO2 flux from El Chichón crater in the period from 2014 to 2015 increased by a factor of 3 (from ~260 t d−1 to ~800 t d−1) compared to the 2007–2008 data. The mechanism triggering the CO2 flux from the lake surface has changed from being dominantly diffusive to mainly advective (bubbling). The Cl concentration was steadily decreasing during the last two decades in the Na‐Cl boiling springs feeding the lake. Since 2013, for both lake and SP springs, the Cl concentration has increased up to the 2005 Cl concentration levels. A large degassing spot in the middle of the lake was found in April 2015 with a CO2 flux of more than 10,000 g m−2 d−1. These observations are the evidence of the onset of a new stage of activity within the volcano‐hydrothermal system of El Chichón volcano associated most probably with changes in the magmatic activity at depth.