2018 GMC SIERRA 1500 Complaints

WHILE UNDER POWER AND DRIVING, THE TRUCK EXPERIENCES NOTICEABLE VIBRATIONS THAT SEEM TO COME FROM THE DRIVETRAIN.

TL* THE CONTACT OWNS A 2018 GMC SIERRA 1500. THE CONTACT STATED THAT THE AIR CONDITIONER WAS INOPERABLE, CAUSING VISIBILITY ISSUES WHILE DRIVING. DUE TO THE FAILURE, THE DEFROSTER/DEFOGGER SYSTEM WAS INOPERABLE. MCCONNELL AUTOMOTIVE (3150 DAUPHIN ST, MOBILE, AL 36606, (251)476-4141) WAS INFORMED OF THE FAILURE. THE CONTACT WAS INFORMED THAT THE VEHICLE WAS NOT SUBJECTED TO A RECALL. THE DEALER PROVIDED AN ESTIMATE OF $1,191 TO REPAIR THE VEHICLE. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE 50,724.

PURCHASED VEHICLE BRAND NEW FROM DEALERSHIP AND FROM DAY ONE, I NOTICE THE POWER TRAIN SLOW TO SHIFTING FROM GEAR ONE TO TWO. THE VEHICLE HESITATES AND SOMETIMES SHIFTS HARD ONLY DURING COLD STARTS. EVERY TIME I TAKE IT IN FOR MY SCHEDULE SERVICE I REPORT THE SAME ISSUE TO MY SERVICE ADVISOR ALONG WITH THE SERVICE MANAGER AT THE GMC DEALERSHIP. THEY SAY THAT IT IS A NORMAL PROBLEM AND THEY KNOW ABOUT IT. THE LAST SCHEDULE SERVICE I TOLD THEM ABOUT THE SAME PROBLEM, THIS TIME HIS SERVICE TECH TEST DROVE VEHICLE AND SAID TORQUE CONVERTER WAS SHUDDERING CAUSING VIBRATION. THE SOLUTION HE SAID THEY CHANGED THE TRANSMISSION FLUID. TODAY I STILL NOTICE THE SAME ISSUE AND WILL REPORT TO THE DEALERSHIP NEXT TIME I TAKE IN FOR SERVICE. I HAVE READ THIS IS A COMMON PROBLEM FROM THE MANUFACTURE SINCE PUTTING IN AN 8 SPEED TRANSMISSION. I FEEL THIS IS A SAFETY ISSUE AND SOME DAY I MAY FEEL THAT THE TRANSMISSION MAY LOCK UP ON ME AND MAY CAUSE AN ACCIDENT. *TR

WHEN TRUCK IS IN MOTION SHIFTING FROM REVERSE TO FIRST/SECOND GEAR IT JUMPS FORWARD INTO GEAR. THERE IS A HESITATION SHIFTING INTO GEAR. IT IS A VERY WELL KNOWN PROBLEM WITH THE 8 SPEED TRANSMISSION. I HAVE BEEN IN CONTACT WITH THE DEALER BUT 3 DIFFERENT TIMES. THE KNOW THE PROBLEM AS DOES GMC. THEY ACTUALLY CAN FIX THE PROBLEM. BUT WILL NOT DO ANYTHING UNTIL GMC SENDS OUT A TECHNICAL BULLETIN. THERE HAS BEEN AN UNBELIEVABLE AMOUNT OF COMPLAINTS. I UNDERSTAND GMC IS HESITANT BECAUSE THEY MAY HAVE TO REPLACE TRANSMISSION AND OR TORQUE CONVERTER WHICH WOULD NATURALLY COST A LOT OF MONEY. BUT ALSO I UNDERSTAND CHANGING TO A DIFFERENT TRANSMISSION FLUID WILL HELP. BUT DEALER WILL NOT DO IT. THIS HAS BEEN GOING ON SINCE THE DAY I BOUGHT IT BRAND NEW AND I ONLY HAVE 5700 MILES ON IT. I HAVE NOT HAD ACCIDENT BECAUSE OF THIS. BUT CONCERNS ME WITH THE HESITATION AND JUMPING IN TO GEAR. ALSO IT DOES NOT DO IT EVERY SINGLE TIME. DEPENDS ON YOUR TAKE OFF SPEED. *TR

I BOUGHT THIS VEHICLE NEW FROM DAY ONE I NOTICED THE TRUCK WAS JERKING BETWEEN 2ND GEAR AND THIRD. ONLY WHEN COLD I FIGURED IT WAS NORMAL. I HAVE 11,000 MILES NOW AND THE JERKING IS WORSE AND DOES IT WHEN I HOLD A SPEED BETWEEN 45MPH AND 50MPH ALSO. WHEN I AM COMING TO A STOP IT HIT HARD INTO 1ST GEAR AND WHEN I TAKE OFF IT HITS HARD INTO 2ND GEAR. *TR

CONDENSER ON AC LEAKING AT SAME LOCATION AS THE 2014-2017 MY. WARRANTY WAS OUT DUE TO MILEAGE BUT TRUCK IS ONLY 2 YEARS 3 MONTHS OLD. BLOWING WARM AIR WHEN AC WAS TURNED ON. *TR

A/C STOPS WORKING 2.) MECHANIC DOES VACUUM TEST AND REPLACES REFRIGERANT ($200) FREON 3.) A/C IS BLOWING HOT AIR AGAIN AFTER 3 DAYS; REFRIGERANT COMPLETELY GONE 4.) MECHANIC RUNS DYE THROUGH LINES TO FIND THE LEAK, REPLACES REFRIGERANT AGAIN AND STATES THE PROBLEM IS COMPRESSOR FAILURE ($200) AGAIN 5.) THE OVERALL FIX WOULD BE TO REPLACE THE COMPRESSOR ($1,000) BUT THERE ARE NO COMPRESSORS TO BE FOUND, THE PART IS ON NATIONAL BACKORDER BECAUSE OF THE WIDESPREAD PROBLEM." LEFT SIDE OF WHEEL MAKING ALOUD NOISE WHEN BACKUP , IT IS A KNOW PROBLEM WITH THE STEERING RACK TANSMISSION DOWNSHIFT FROM 30-15 MAKE A PUSH EFFECT AND COUCHING NOISE

THE FRONT END OF MY TRUCK HAS AN VERY NOTICEABLE INTERMITTENT RUMBLE AND SHAKE WHEN I'M HOLDING STEADY AROUND 1200 RPM AND 45 MPH. MY RPM GAUGE WILL SURGE ABOUT 50-100 RPMS WHEN IT RUMBLES. IF I SPEED UP OR SLOW DOWN IT GOES AWAY. MY WHEELS AND TIRES ARE BALANCE SO THAT NOT THE ISSUE AND MY DRIVE IS SMOOTH OTHERWISE. *TR

I HAVE A 2018 GMC SIERRA DENALI, WHEN THE VEHICLE IS COLD, USUALLY FIRST THING IN THE MORNING, THE TRUCK STARTS OUT IN FIRST GEAR AND THEN FEELS LIKE IT LACKS POWER OR TRANSMISSION IS SLIPPING AND THEN BANGS INTO 2ND GEAR.THE MORE I DROVE THE TRUCK THE WORSE IT GOT. WHILE DRIVING DOWN THE ROAD THERE IS A VIBRATION WITHIN THE TRUCK. THE FASTER YOU GO THE MORE OF A VIBRATION YOU FEEL. DURING THE VIBRATION THE STEERING WHEEL IS NOT SHAKING AND WHEN YOU LET GO OF THE WHEEL THE TRUCK STAYS STRAIGHT, SO IT'S NOT THE FRONT END. TOOK THE TRUCK TO THE DEALERSHIP WHERE IT WAS PURCHASED, PELLEGRINO GMC, WHICH IS A 30 MINUTE DRIVE AND THEY COULDN'T DUPLICATE THE PROBLEMS. THE SERVICE ADVISOR WAS ADVISED PRIOR TO MY APPOINTMENT, THAT THE BANGING INTO GEAR ONLY HAPPENS WHEN ITS IS COLD. HE ADVISED ME THAT WHAT I WAS FEELING WAS A NORMAL SHIFT FOR MY TRUCK. I ADVISED HIM ABOUT THE SERVICE BULLETINS AND HE STATED THAT IT DIDN'T PERTAIN TO MY TRUCK.THE MECHANIC TEST DROVE MY VEHICLE FOR 13 MILES AND DIDN'T FEEL THE VIBRATION. HE CHECKED THE ENGINE CODES AND FOUND NONE. I HAVE HAD THE TRUCK A LITTLE OVER A YEAR AND IT HAS 6000 MILES ON THE ODOMETER.

JUMPS INTO GEAR HARD FROM 1ST TO 2ND GEAR UNDER 25 MPH VERY DANGEROUS WHEN ON ICY ROADS AND ALSO DOWN SHIFTING COMING DOWN FROM A HILL RPM'S STAY HIGH EVEN THOUGH YOU AREN'T GOING VERY FAST LESS THEN 17000 MILES ON IT HAD IT TOO THE DEALER NOTHING THEY CAN DO JUST DOCUMENT IT