2018 GMC SIERRA 1500 Complaints

UPON STARTING THE ENGINE THE VEHICLE MAKES A CLANK SOUND AND EITHER SURGES FORWARD OR BACKWARDS SLIGHTLY. IT SEEMS TO DO IT MORE OFTEN ON A LIGHT INCLINE. LOCAL CHEVROLET ( GM) DEALER HAS LOOKED OVER TWICE, NO SUGGESTIONS MADE OR GIVEN TO ME.

WHEN 1ST CRANKING TRUCK AND PUT IN DRIVE MOTORS RREV UP AND SHIFTS HARD TO SECOND. OCCASIONALLY WHEN I OUT IN REVERSE IT WILL SIT THERE N NOT SHIFT IN. THEN WHEN IT DOES IT SHIFTS HARD. WHEN ACCELERATING THE TRUCK IT SOUNDS LIKE A CLATTERING SOUND UNDER DRIVERS SIDE UNDER HOOD. TRIED DIFFERENT TYPE OF GASOLINE AND NOTHING CHANGES. GMAC NEEDS TO DO A RECALL ON BOTH OF THESE ITEMS. I AM VERY DISAPPOINTED IN MY GMC AND GMAC

DAILY THE TRANSMISSION HAS A HARD SHIFT FROM 1ST TO 2ND GEAR. POTENTIALLY CAUSING ME TO LOOSE CONTROL OF THE VEHICLE. IVE HAD IT IN THE GMC SHOP 3 TIMES AND GMC IS UNABLE TO FIX THE PROBLEM. AFTER THE VEHICLE SITS FOR PERIODS OF 4 HRS OR MORE THE PROBLEM REOCCURS. THIS IS A SERIOUS POLITICAL SAFTEY HAZARD IN THE 8SPEED TRANSMISSION AND NEEDS TO BE RECALLED AND FIXED WITH A NEW TRANSMISSION.

THE SIERRA SURGES FROM PARK TO REVERSE AND DRIVE. I BUMPED A VEHICLE TODAY, AND THE SURGE HAS BECOME AN ISSUE THIS WEEK AND THERE IS NOT EVEN 9,000 MILES ON THE TRUCK. THE AFM IS ROUGH SHIFTING BETWEEN V8 AND V4 MODE TOO. NONE OF THIS WAS AN ISSUE UNTIL RECENTLY. MY SPEAKERS ALSO VIBRATE LIKE A BLOWN SPEAKER ON HIGH DEFINITION RADIO, BUT NOT ON REGULAR RADIO STATIONS.

AT 40MPH LOUD BANG FELT LIKE WE WERE REAR ENDED, SOUNDED LIKE WE WERE REAR ENDED, HUGE JOLT FORWARD NEARLY CAUSING ACCIDENT, POSSIBLE BACK INJURY, SEATS JOLTED, LOOKED BEHIND US AND NOTHING THERE. WAS DRIVING AT 30-35MPH AND JUST ACCELERATED SLIGHTLY TO PASS A CAR WHEN THIS HAPPENED. CITY STREET 3 LANES. DEALER TURNED US AWAY BECAUSE COULD NOT DUPLICATE FOR THEM. GMC SAID CASE WAS ACCELERATED NO CALL BACK AS OF YET.

DOCUMENT ID 4605342 #16-NA-361 : INFORMATION ON TRANSMISSION HARSH 1-2 SHIFT UPON FIRST START UP/SHIFT OF THE DAY UNDER LIGHT THROTTLE THIS GM BULLETIN WAS ISSUED JUL 21, 2017 ON NUMEROUS VEHICLES AND ACCORDING TO THIS BULLETIN THE PROBLEM DOES NOT HAVE A RESOLUTION. THE BULLETIN CLEARLY STATES CHANGING THE ENTIRE TRANSMISSION WILL NOT SOLVE THIS ISSUE. THIS IS AFFECTING MY GMC WITH THE 8 SPEED TRANSMISSION. GM HAS KNOWN ABOUT THIS ISSUE BUT HAS NONE THE LESS SOLD THE VEHICLES TO CONSUMERS WITHOUT DISCLOSURE. NEITHER GM OR DARREL WALTRIP GMC IN FRANKLIN TN DISCLOSED THIS ISSUE PRIOR TO THE SALE. THE SERVICE DEPT AT THE DEALER ADMITTED THE ISSUE CANNOT BE REPAIRED AND TOLD ME GM IS UNWILLING TO DO A TRADE ASSISTANCE OR BUYBACK. GM CLAIMS NOTHING IS WRONG WITH MY CAR YET HAS A CLEAR DOCUMENT THAT SAYS OTHERWISE.

WHILE THE TRUCK IS IN MOTION AND WHEN ACCELERATING AROUND 15-20 MPH THE TRANSMISSION WILL SOMETIMES "HUNT" FOR A GEAR CAUSING THE TRUCK TO NOT ACCELERATE. THIS RESULTS IN A MILD JERKING OF THE TRUCK WHEN IT IS TRYING TO ACCELERATE AND FEELS LIKE THE TRANSMISSION IS SLIPPING/SKIPPING. THIS IS MORE APPARENT WHEN GOING UP A GRADE VERSUS ON A FLAT SURFACE. SO I HAVE TO PUSH HARDER ON THE GAS PEDAL WAITING FOR THE TRUCK TO SHIFT. THIS IS A SAFETY ISSUE SINCE WHEN NOT PROPERLY ACCELERATING INTO TRAFFIC, AN ACCIDENT IS MORE LIKELY TO OCCUR. I SEE THAT THIS ISSUE HAS ALREADY BEEN REPORTED IN ANOTHER INCIDENT ON YOUR WEBSITE. I HAVE HAD THIS ISSUE SINCE I BOUGHT THE TRUCK ON 02/2018 AND THE REASON I HAVE WAITED TO REPORT IS DUE TO THE DEALER STATING TO ALLOW THE COMPUTER TO UPDATE/LEARN YOUR DRIVING HABITS. I HAVE 11,000 MILES ON THE TRUCK NOW AND STILL EXPERIENCING THE ISSUE.

PASSENGER SIDE HEADLIGHT JIGGLES UP AND DOWN CONSTANTLY OVER EVERY SMALL BUMP. VERY DISTRACTING AND LEAVES MANY BLACK AREAS ON THE ROAD FROM LACK OF LIGHT. FIX THIS IMMEDIATELY!

DRIVING SLOWLY IN BUMPER TO BUMPER TRAFFIC. I WAS STOPPED WITH MY FOOT ON THE BRAKES, AND THE TRUCK STARTED MOVING FORWARD. I THOUGHT ENGINE SURGE, BUT IT WAS NOT. I PUMPED BRAKES HARD AND THE TRUCK STOPPED. THIS HAS HAPPENED 2 TIMES.

EXTREMELY HARD SHIFTING ON LOWER GEARS. WHEN SLOWING WHEN IT GOES FROM 2ND TO 1ST IT FEELS LIKE I GOT REAR-ENDED. NOT ALL THE TIME BUT ONCE A DAY AT LEAST. IT ALSO SHUDDERS WHEN SLOWLY ACCELERATING IN TRAFFIC, SOMETIMES THE RPM GOES WAY HIGH AND IT LURCHES FORWARD WHEN IT UPSHIFTS.