MY WIFE'S 2015 TAHOE HYDROPLANED SLID BACKWARDS INTO THE MEDIAN, HIT A GUARD RAIL AND ROLLED 3 TIMES. ALL SIDE CURTAIN AIRBAGS DEPLOYED BUT NOT THE FRONT AIRBAGS. THIS WAS ON 8/4/2017. THEN 2 WEEKS LATER WE RECEIVED A RECALL LETTER FOR THE SDM SOFTWARE WHICH CONTROLS THE FRONTAL AIRBAGS AND SEATBELT PRETENSIONERS.