Cruise control speed surge on downgrades
VEHICLE SPEED CONTROL
18 NHTSA complaints · 2017-01 → 2025-10
“SPEED CONTROL ENGAGED GOING DOWNHILL ON HIGHWAY AT 60 MPH - CAR ACCELERATES VERY QUICKLY TO OVER 70 MPH AND THE TAC GOES TO 4500. TO DISENGAGE I EITHER TURNOFF SPEED CONTROL OR BRAKE. THIS HAPPENED FOUR TIMES TODAY”
“WHEN GOING DOWN HILL, THE CRUISE CONTROL RACES THE ENGINE INTO HIGH RPM (4000+ RPM) RATHER THAN SLOWING THE ENGINE AND CONTROLLING THE CAR SPEED. IT HAS DONE THIS SINCE IT WAS NEW”
“WHEN THE CRUISE CONTROL IS ENGAGED AND THE VEHICLE IS ON A DECLINE THE CRUISE CONTROL DOES NOT MAINTAIN THE SET SPEED. DEPENDING ON THE SEVERITY OF THE DECLINE THE SPEED WILL INCREASE FROM 5 TO 15 MPH”