Some Volvo XC70 owners report experiencing a blinking check engine light while driving at high speeds, which indicates a serious issue that requires immediate attention to prevent potential motor damage. This warning typically signifies a critical engine misfire, and if not addressed promptly, it can lead to costly repairs and damage to the catalytic converter. Owners are advised to safely pull over and turn off the engine to avoid further complications. Ignoring this warning can result in significant safety hazards on the road, and it is recommended to seek assistance from a qualified mechanic or Volvo dealer as soon as possible to diagnose and resolve the issue.