2016 Chevrolet Colorado

SINCE PURCHASE OF VEHICLE, IT HAD A BUCKING AT SPEED OF 25-40 MPH, THIS WAS VERY NOTICEABLE IN CITY DRIVING, THIS ISSUE WAS COUPLE WITH UNCONTROLLED SURGES IN THE ENGINE. THE VEHICLE WAS PURCHASE OCT 28 OR 30, 2016. I TURNED IN THE VEHICLE FOR SERVICE ON DEC 19, 2016, DEALER SERVICE REP CONFIRM THERE WAS AN ISSUE AND KEEP THE TRUCK FOR REPAIRS. VEHICLE WAS IN THE SERVICE DEPARTMENT FOR OVER 40 CONSECUTIVE DAYS TO FIX ISSUE, DEALERSHIP TECHS, AS WELL AS GM FIELD REPS HAVE LOOKED AT THE VEHICLE AND HAVE TRIED TO FIX IT TO NO AVAIL. ON FEB 8, THE GM REP SAID THERE IS NOTHING WRONG WITH THE VEHICLE AND THE ISSUE WAS A SOFTWARE PROBLEM WITH THIS SPECIFIC TYPE VEHICLE AND THAT THE SOFTWARE THIS VEHICLE HAS IS A NEW SOFTWARE. WHEN I ASKED IF THIS ISSUE IS BEING WORKED BY THE SOFTWARE ENGINEERS FOR SOLUTION THE REP SAID HE HAS NO IDEA AND THAT I SHOULD TAKE THE VEHICLE BACK. THIS ISSUE IS A SAFETY PROBLEM ESPECIALLY WHEN SUDDENLY SURGES WITHOUT CONTROL, PARTICULARLY WHILE DRIVING IN A CITY CENTER A DRIVER CAN CAUSE AN ACCIDENT OR POTENTIALLY HIT A PERSON WHILE LOOSING CONTROL. GM COSTUMER ASSISTANT WAS CONTACTED, BUT THERE WAS NOT HELP AND GM REFUSES TO LET ME KNOW WHEN THE FIXES FOR THIS ISSUE WILL BE OUT. THEREFORE I HAVE REFUSE TO TAKE POSSESSION OF VEHICLE UNTIL IF FIXED CORRECTLY!! THIS ISSUE WILL AFFECT ALL 2016 AND UP COLORADO WITH DURAMAX ENGINE AND NEW SOFTWARE VERSION INSTALLED ON THEM.

VEHICLE HAS ERRATIC DOWNSHIFTING AND UPSHIFTING OF THE AUTOMATIC TRANSMISSION CAUSES ABRUPT CHANGES IN ACCELERATION AND DECELERATION THAT SETS UP SEQUENCES THAT FORCE THE DRIVER TO CONTINUALLY PRESS DOWN ON, OR LET UP, ON THE BREAK AND OR ACCELERATOR TO ATTEMPT TO BLEND IN WITH STOP-AND-GO TRAFFIC. ONLY GETTING 15-16.5 MPG CITY DRIVING.

THIS VEHICLE'S ERRATIC DOWNSHIFTING AND UPSHIFTING OF THE AUTOMATIC TRANSMISSION CAUSES ABRUPT CHANGES IN ACCELERATION AND DECELERATION THAT SETS UP SEQUENCES THAT FORCE THE DRIVER TO CONTINUALLY PRESS DOWN ON, OR LET UP, ON THE BREAK AND OR ACCELERATOR TO ATTEMPT TO BLEND IN WITH STOP-AND-GO TRAFFIC. IN VERY HEAVY TRAFFIC, PRESENT WHEN ENTERING OR LEAVING LARGE CITIES, THE ONSET AND CONTINUANCE OF THIS VEHICLE'S PERFORMANCE WORSENS RESULTING IN DRIVER FATIGUE AND EXTREME STRESS, BROUGHT ON BY THE EVER PRESENT NECESSITY TO BE EXTRA WATCHFUL AND TO MANEUVER TO AVOID HITTING THE VEHICLE IN FRONT, OR BEING REAR-ENDED. WHEN DRIVING THROUGH MOUNTAINOUS TERRAIN AT TODAY'S INTERSTATE SPEEDS, THERE IS RECURRING "BUMPING" THAT SETS UP WHEN ASCENDING LONG GRADES. IT CREATES THE FEELING THAT EITHER THE TRANSMISSION IS ATTEMPTING TO DOWNSHIFT BUT THEN CHANGES ITS MIND, OR THE ENGINE'S RPM ARE ABOUT TO INCREASE BUT DON'T. THIS ADDS TO FEAR OF IMMINENT FAILURE AND BEING LEFT STRANDED. THIS BEHAVIOR WAS PRESENT FROM THE VERY FIRST TIME THE VEHICLE WAS DRIVEN. IT'S GETTING WORSE.THIS DRIVER BELIEVES THE UNSAFE OPERATING PERFORMANCE OF THIS VEHICLE AS DESCRIBED ABOVE, IS EXACERBATED BY THE COMBINATION OF THE SMALL, 4 CYLINDER ENGINE COUPLED TO THE 6 SPEED TRANSMISSION, THAT REQUIRES THE ENGINE TO RAPIDLY DOWNSHIFT OR UPSHIFT TO PROVIDE THE NEEDED PERFORMANCE REQUIRED IN TODAY'S DRIVING ENVIRONMENTS. FURTHER, IT IS EVIDENT THE SOFTWARE CONTROLLING THE TRANSMISSION'S OPERATING BEHAVIOR WAS NEITHER FULLY DEVELOPED NOR TESTED THROUGHOUT ITS ANTICIPATED FULL OPERATING RANGE AND AS SUCH CREATES A VEHICLE THAT IS DANGEROUS TO OPERATE ON PUBLIC ROADS ATTEMPTS TO HAVE THESE ISSUES ADDRESSED WITH THE DEALER RESULTED IN BEING TOLD..." NOTHING CAN BE DONE...THE PROBLEMS YOU ARE ENCOUNTERING ARE BEING ARE BEING EXPERIENCED BY MANY CUSTOMERS. CHEVROLET IS NOT PROVIDING ANY SOLUTIONS". *TR

IN MOTION, WHEN DRIVING SPEED LIMIT AND THEN YOU LET OFF ACCELERATOR TO SLOW DOWN AND THEN YOU PRESS GAS AGAIN IT HESITATES AND DOES NOT WANT TO ACCELERATE. I TOOK TO DEALERSHIP AND THEY SAID THEY FIXED BY PROGRAMMING SOMETHING IN COMPUTER AND IT RAN FINE FOR 3 DAYS AND STARTED DOING SAME THING AGAIN. AND ALSO, WHEN YOU ACCELERATE AND IT WILL NOT RESPOND YOU GIVE IT A LOT OF GAS AND IT MAKES RPMS GO TO LIKE 5000, BUT THE RPM DO NOT MATCH THE SPEED, ITS VERY STRANGE. I SEE OTHER COMPLAINTS ABOUT THE SAME THING ON FORUMS. *TR

VEHICLE HESITATES AND STUMBLES ON ACCELERATION DURING MOTION WHEN ACCELERATION IS RESUMED WHILE MOVING. IT SEEMS THAT THE TRANSMISSION IS NOT SHIFTING DOWN. YOU HAVE TO GET INTO THE ACCELERATION, WHICH IS A SAFETY CONDITION IN TRAFFIC. AT TIMES IT STUMBLES BAD ENOUGH TO SLOW SPEED DRAMATICALLY, WHICH IS ALSO A SAFETY CONDITION ON INTERSTATE. TOOK THE VEHICLE TO DEALERSHIP AND THEY ARE DEDICATED TO SAYING THAT THERE IS NO CODES UP AND I AM NEARLY AT THE POINT TO SEEK HELP FROM LAWYER ON THE SITUATION.

TRANSMISSION DOES NOT DOWNSHIFT PROPERLY UNDER ANY TYPE OF ACCELERATION (SLOW OR SUDDEN) ESPECIALLY BETWEEN 20 MPH AND 40 MPH IN NORMAL STREET TRAFFIC AND ON THE HIGHWAY. IT ALSO HUNT FOR GEARS ESPECIALLY BETWEEN GEARS 4 THROUGH 6. IT HESITATES FOR APPROXIMATELY 2 TO 3 SECONDS, FINDS A GEAR, HESITATES AGAIN, AND THEN DROPS TO AN EVEN LOWER GEAR AND OVER ACCELERATES. WHAT I HAVE OBSERVED IS THAT THE VEHICLE IS TOO EAGER TO UPSHIFT AND SOMETIMES GOES INTO 5TH OR 6TH GEAR AND DROPS THE ENGINE BELOW 1000 RPM. IT STAYS IN THAT GEAR WHEN SLOWING DOWN AND WHEN ACCELERATED IT STAYS IN THE HIGH GEAR ON BOGS DOWN AND ON TWO OCCASIONS STALLED. THIS IS DANGEROUS ESPECIALLY IN HIGHWAY TRAFFIC AND IS ESPECIALLY DANGEROUS WHEN ACCELERATING TO PASS OR ACCELERATING ON AN HIGHWAY ONRAMP TO MERGE WITH TRAFFIC. I HAVE TAKE THE TRUCK TO DEALER AT AROUND 2000 MILES. WAS TOLD THAT THEY COULDN'T FIND ANY PROBLEMS AND THEY "RESET" THE TRANSMISSION. IT RAN FINE FOR ONE DAY AND BEGAN THE PROBLEMS AGAIN. I HAVE OPERATED THE TRUCK NOW TO 6000 MILES TO SEE IF THE TRANSMISSION CAN "LEARN" ITS WAY OUT OF THIS AND IT HAS NOT. I AM GOING TO DEALER AGAIN AND IF THEY TELL ME AGAIN THAT THERE IS NO PROBLEM, I AM GOING TO FORCE THE SERVICE MANAGER TO DRIVE WITH ME FOR A DAY TO EXPERIENCE THE PROBLEM.

ON NUMEROUS OCCASIONS WHILE ENTERING/EXITING VEHICLE MY KNEE LIGHTLY BRUSHES THE 4 WHEEL DRIVE ENGAGE SWITCH LOCATED ON THE DASHBOARD. THIS ACTIVATES THE 4 WHEEL DRIVE ON THE VEHICLE. THIS IS HAPPENING WITHOUT MY KNOWLEDGE. SINCE THERE IS NO OBVIOUS INDICATOR ON THE DASH THE THE VEHICLE IS IN 4 WHEEL DRIVE, IF I DO NOT NOTICE THE BRIEF "ENGAGING 4 WHEEL DRIVE MESSAGE" THERE IS NO WAY OF KNOWING THAT IT IS IN 4 WHEEL DRIVE UNTIL THE VEHICLE STARTS "HOPPING" ON DRY PAVEMENT WHILE TURNING. SHOULD THIS HAPPEN AT HIGHWAY SPEED ON A CURVE THERE IS THE STRONG RISK ON A ROLLOVER. I HAVE FOUND MYSELF HAVING TO REGULARLY CHECK THE KNOB IN ORDER TO DETERMINE IF THE 4 WHEEL DRIVE IS INADVERTENTLY ENGAGED BY THIS LIGHT BRUSHING OF THE KNOB.

"THE TRANSMISSION DOES NOT DOWNSHIFT FROM A HIGH GEAR (5 OR 6) TO A LOWER GEAR WHEN SLOWING DOWN FROM 45 MPH TO 20 MPH (OR LOWER). WHEN THE ACCELERATOR IS DEPRESSED TO ACCELERATE THE ENGINE BUCKS, VIBRATES, AND DOES NOT ACCELERATE. THE ENGINE RPM DROPS TO 1,000 RPM OR LOWER. IF THE ACCELERATOR IS QUICKLY FLOORED THE TRANSMISSION DOWNSHIFTS SEVERAL GEARS LOWER AND JERKS FORWARD. THIS CONDITION HAPPENS PRIMARILY ON SECONDARY ROADS WHILE DRIVING ALONG THE ROAD AND WHEN PULLING FROM ONE ROAD INTO TRAFFIC ON ANOTHER ROAD. THE SITUATION WHEN PULLING INTO TRAFFIC IS DANGEROUS BECAUSE THE TRUCK DOES NOT ACCELERATE AS IT SHOULD. THIS TRUCK WAS PURCHASED NEW AND HAS 1200 MILES ON IT. THIS CONDITION HAS BEEN PRESENT SINCE THE TRUCK WAS PURCHASED AND THE SEVERITY VARIES WITH TRUCK SPEED AND ROAD INCLINATION. I REPORTED THE SITUATION TO THE DEALER AND THEY ATTEMPTED A FIX (HAD THE TRUCK FOR THREE DAYS) THAT SUPPOSEDLY INVOLVED A "NEW DOWNLOAD" FROM CHEVROLET, BUT IT DIDN'T CHANGE A THING. DEALER KNOWS IT DIDN'T FIX ANYTHING AND SAYS CHEVROLET MAY HAVE A "RECALL UPDATE", BUT READING ALL THE OTHER SIMILAR COMPLAINTS, I'M SUSPICIOUS. IN THE 1 MONTH I HAVE HAD THE TRUCK, I HAVE ALMOST BEEN HIT TWICE BY APPROACHING TRAFFIC BECAUSE OF HESITANT ACCELERATION. THIS IS A DANGEROUS PROBLEM AND CHEVROLET NEED TO FIX IT IMMEDIATELY. I