To resume cruising speed at more than approximately 25 mph (40 km/h)

If any method other than the CRUISE ONOFF switch was used to cancel cruising speed and the system is still activated, the most recent set speed will automatically resume when the RES/+ switch is pushed. It will not resume, however, if the vehicle speed has dropped below approximately 25 mph (40 km/h)
See also:
2012 Hyundai Elantra Review By Anthony Crawford
I’ve just driven a 42km loop in the base model Elantra Active with a
six-speed manual shifter and I can tell you unequivocally that the all-new
Elantra is a huge step up from the previous model.
...
60,000 miles (96,000 km) or 48 months
❑ Inspect vacuum hose
❑ Inspect air conditioning refrigerant
❑ Inspect brake hoses and lines
❑ Inspect drive shafts and boots
❑ Inspect electronic throttle contr ...
150,000 miles (240,000 km) or 120 months
❑ Inspect vacuum hose
❑ Inspect air conditioning refrigerant
❑ Inspect brake hoses and lines
❑ Inspect drive shafts and boots
❑ Inspect electronic throttle contr ...


