Flex fuel vehicles can develop fuel calibration issues resulting in illumination of the Check Engine Light and/or lack of power. This commonly occurs if only short trips are taken after changing fuel type from E85 to gasoline or gasoline to E85. In most cases, the fuel calibrations can be reset for gasoline using a properly equipped scan tool.
Check Engine Light and/or Lack of Power Due ot Flex Fuel Calibration Error on Chevrolet Monte Carlo
3 people reported this problem
same thing how to take it to dealers a month later