NHTSA Complaint #11030226 — 2004 CHEVROLET COLORADO

IDLE CONTROL VIA ELECTRONIC THROTTLE BODY RAISES RPM VERY HIGH WHEN THE ACCELERATOR PEDAL IS NOT DEPRESSED, CAUSING UNCONTROLLED ACCELERATION OF VEHICLE DURING COASTING OR WHEN BRAKE PEDAL IS APPLIED. TURNING THE VEHICLE OFF WITH THE KEY IS THE ONLY ACTION THAT HAS RESULTED IN A CESSATION OF EXTREMELY HIGH IDLE. AFTER RESTARTING THE VEHICLE, THE SYMPTOM IS GONE AND THE VEHICLE OPERATES NORMALLY. THIS BEHAVIOR IS ERRATIC AND INCONSISTENT, THE PROBLEM HAS BEEN DIFFICULT TO DUPLICATE DURING DIAGNOSIS. ALL TESTING AND INSPECTION OF THE ELECTRONIC THROTTLE BODY, WIRING HARNESS, CONNECTORS, AND FUNCTIONS WITHIN THE ENGINE COMPUTER HAS SHOWN NO DEFECT OR INDICATION THAT A WIRING FAULT, DIRTY THROTTLE BODY, OR OTHER "WEAR AND TEAR" ITEM IS THE CAUSE OF THIS INTERMITTENT REVVING AT IDLE. THE MOST RECENT EVENT OCCURRED ON AUGUST 9TH 2017. THIS HAS BEEN OCCURING FOR AT LEAST 6 MONTHS, ON AVERAGE ONCE A MONTH IN FREQUENCY.