Complaint volume
290 consumer-submitted complaints are matched to this model year. Treat the count as a research signal, then read the actual summaries for repeated symptoms.
Complaint records
2018 GMC Sierra Complaints
290 consumer-submitted complaints on record for the 2018 GMC Sierra, grouped by component category.
290 Total complaints
10 Crash reports
1 Fire reports
5 Injury reports
Complaint data reflects consumer-submitted reports. A complaint is not proof
of a defect, recall, or manufacturer fault. Enriched severity fields come
from official bulk records when the complaint can be matched by ODI number.
Buyer interpretation
How to use these complaints before buying
Complaint records are most useful when they turn into inspection points, seller questions, and comparison checks against nearby model years.
Pattern to inspect
The most common categories are power train, engine, service brakes. Use those categories as a test-drive checklist instead of judging the vehicle from the total count alone.
Severity flags
Enriched records include 10 crash reports, 1 fire report, 5 injury reports, and 0 fatality reports. These fields come from complaint records and should be read in context.
Mileage clue
Mileage is available on 121 complaints, with an average reported failure mileage of 45,272 miles. Compare that with the mileage on the listing.
Questions to ask the seller
- Have you had any problems related to power train, engine, service brakes?
- Can I see recent maintenance and repair records?
- Has the vehicle ever been towed, involved in a crash, or repaired for the same issue twice?
- Can we also check the recall record for this 2018 GMC Sierra?
Used-car checklist
Use these complaints before the test drive.
Build a buyer checklist to turn these issues into questions and inspection points.
2018 GMC Sierra
Build buyer checklist Compare with other years Sends year, make, and model to pre-fill your checklist.
How severe are the 2018 GMC Sierra complaints?
10 Crash
1 Fire
5 Injury
0 Fatality
12 Towed
3 Medical attention
What are the most common 2018 GMC Sierra complaint categories?
POWER TRAIN 85
ENGINE 30
SERVICE BRAKES 15
UNKNOWN OR OTHER 14
ELECTRICAL SYSTEM 11
ELECTRICAL SYSTEM,SERVICE BRAKES 10
POWER TRAIN,ENGINE 10
STEERING 10
AIR BAGS 6
SEAT BELTS 4
290 total complaints on record
Latest complaints
| Date | Component | Summary | Severity | Mileage |
|---|---|---|---|---|
| Aug 2021 | POWER TRAIN | Very very bad shudder vibration noticed mostly during light throttle acceleration of 30-64 mph (48-104 km/h) during steady state driving with the transmission not actively shifting gear.. | Crash: No Fire: No | Unknown |
| Jul 2021 | POWER TRAIN | The contact owns a 2018 GMC Sierra 1500. The contact stated that upon depressing the accelerator, the vehicle shuddered while upshifting. There was no warning light illuminated. The contact had taken the vehicle to a local dealer where they were unable to service the vehicle. The contact had also taken the vehicle to an independent mechanic who informed him that there was a TSB placed on the vehicle. He explained that the incorrect type of transmission fluid had been placed in the transmission which would cause the failure that he had experienced. The contact then called Sewell Buick GMC of Dallas (7474 Lemmon Ave, Dallas, TX 75209) where he was informed that he would be charged a diagnostic fee prior to the repair. The manufacturer was notified of the failure but offered no assistance. The vehicle was not repaired. The failure mileage was approximately 45,000. | Crash: No Fire: No | 45,000 |
| Jun 2021 | STEERING,POWER TRAIN | The contact owns a 2018 GMC Sierra 1500. The contact stated while driving at various speeds, the vehicle lost power steering assist causing the steering wheel to become firm. The steering wheel jerked while turning and the vehicle stalled on several occasions almost causing a collision. The vehicle was taken to the dealer and the dealer informed the contact that the failure was related to Technical Service Bulletin 18-NA-161. The vehicle was not repaired. The manufacturer was made aware of the failure. The manufacturer promised to provide a callback. The failure mileage was 47,184. | Crash: No Fire: No | 47,184 |
| Jun 2021 | ELECTRICAL SYSTEM,AIR BAGS | Check engine came on and says manufacture specific issues/codes. Safety restrain system. P10e4 | Crash: No Fire: No | Unknown |
| Jun 2021 | TIRES | All four OEM Bridgestone Dueler A/T P285/45R22 M+S tires are showing premature cracking in sidewall near the bead/wheel. The cracks appear on the full circumference of the tire and vary in length from short to several inches. Depth of cracking is estimated to be 1/16" and growing. The tires, with date code 2318, were on the brand new truck when purchased from the dealership in Aug 2018. The vehicle currently has 16k miles. Both the dealership and local Tires Plus chain have confirmed the issue, but there is not a suitable remedy. Bridgestone will not warranty the tires and replacement under the GM "warranty" is the same price as new aftermarket tires. I believe this is a pending safety concern. | Crash: No Fire: No | Unknown |
| May 2021 | AIR BAGS | The contact owns a 2018 GMC SIERRA. The contact stated that while driving at 35 mph, when another vehicle had collided with the contact's vehicle which resulted in the airbags not deploying. The contact stated no warning lights were illuminated. The contact sustained a head injury and did require medical attention. A police report was filed. The vehicle was towed to a local dealer where it was in the process of being repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 25,000. The VIN was not available. Vehicle has been repaired.*JB | Crash: Yes Fire: No Injuries: 1 Towed Medical attention | 25,000 |
| May 2021 | STRUCTURE | I LEFT HOME TO GO TO THE STORE. WHILE DRIVING ON THE HIGHWAY MY SUNROOF EXPLODED. THERE WERE NO CARS OR TRUCK IN FRONT OF ME OR PASSING ME. NOTHING HIT MY TRUCK. IT SOUNDED LIKE A SHOTGUN GOING OFF INSIDE THE TRUCK. THE SUNROOF EXPLODED SENDING GLASS EVERYWHERE. I WAS DRIVING ON A 5 LANE HIGHWAY, IT WAS RAINING, BUT NOT A BAD STORM. THE ROAD WAS STRAIGHT AND IN GOOD CONDITION. IT HAPPENED SO FAST I DID NOT KNOW WHAT WAS GOING ON. I PULLED INTO A GAS STATION TO CHECK MY TRUCK. I FOUND GLASS ALL IN THE BED OF THE TRUCK AND MOST OF THE SUNROOF GONE. I HAVE TAKEN IT TO THE DEALER AS THE TRUCK IS UNDER WARRANTY. I WAS TOLD THE WARRANTY DOES NOT COVER DAMAGE AND SO FAR NO ANSWER IT THEY WILL COVER IT. I HAVE HAD THE TRUCK FOR ALMOST 3 YEARS AND IT IS NEARING THE END OF THE WARRANTY. | Crash: No Fire: No | 34,960 |
| May 2021 | STEERING | POWER STEERING JUST GOES OUT WHILE DRIVING (PULLING INTO PARKING LOT) AND THEN COMES BACK ON CAUSING AN OVERSTEERING PROBLEM. | Crash: No Fire: No | 48,000 |
| Apr 2021 | STRUCTURE | SPARE TIRE CRANK CABLE BROKE ALLOWING SPARE TIRE TO FALL OUT FROM UNDER THE TRUCK ON THE INTERSTATE AT 70 MPH. SPARE TIRE SLIDE BACKWARDS UNDER MY 5TH WHEEL CAMPER DAMAGING THE CAMPER AND FLYING OFF INTO THE HIGHWAY MEDIAN. | Crash: No Fire: No | 60,000 |
| Apr 2021 | ENGINE | TL* THE CONTACT OWNS A 2018 GMC SIERRA 1500. THE CONTACT STATED THAT THE VEHICLE VIBRATED ABNORMALLY WHILE DRIVING. THE VEHICLE WAS TAKEN TO INGERSOLL AUTO OF DANBURY (84 FEDERAL RD, DANBURY, CT 06810, (203)885-7774) FOR AN OIL CHANGE AND THE ENGINE WAS FLUSHED ON FOUR OCCASIONS. THE CONTACT STATED THAT THE VIBRATION INCREASED. THE VEHICLE WAS TAKEN TO THE SAME DEALER AND A TIRE ROTATION AND ALIGNMENT WAS PERFORMED. THE CONTACT WAS ALSO INFORMED THAT THE TIRES NEEDED TO BE REPLACED. THE TORQUE CONVERTER WAS ALSO REPLACED HOWEVER, THE FAILURE REMAINED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE AND REFERRED THE CONTACT TO NHTSA FOR ASSISTANCE. THE APPROXIMATE FAILURE MILEAGE WAS 47,000. | Crash: No Fire: No | 47,000 |
| Mar 2021 | ENGINE | AT 55000 MILES THE RADIATOR STARTED TOO LEAK GM WOULD ONLY PAY 250.00 DOLLARS OF THE 876.00 IT COST | Crash: No Fire: No | 60,150 |
| Mar 2021 | ENGINE | WHILE DRIVING WITH THE ROADS IN A WET CONDITION, FOR VARIOUS LENGTHS OF TIME, AND IN DIFFERENT MANEUVERS, THE SERVICE ENGINE LIGHT WILL START FLASHING AND THE VEHICLE WILL BEGIN TO LOSE POWER. AFTER A FEW MINUTES, THE SERVICE ENGINE LIGHT WILL GO SOLID AND THE TRACTION CONTROL LIGHT WILL ILLUMINATE. THE VEHICLE LOSES MORE POWER. ON BRAKING, JUST BEFORE THE VEHICLE COMES TO A COMPLETE STOP, THERE IS A CLUNK IN THE TRANSMISSION AND THE VEHICLE LURCHES. THIS HAS OCCURRED 6 TIMES IN THE LAST 14 MONTHS. UPON INVESTIGATION, TROUBLE CODE P0308 SHOWS IN THE OBD TOOL. THE ISSUE COULD NOT BE REPRODUCE BY THE DEALERSHIP SO THERE HAS NOT BEEN ANY RESOLUTION, JUST THOUGHTS. | Crash: No Fire: No | 33,000 |
| Mar 2021 | POWER TRAIN | I HAVE TAKEN MY TRUCK TO TEMECULA VALLEY BUICK GMC ON 3 SEPARATE OCCASIONS AFTER NOTICING MY TRANSMISSION SHIFTS HARD. I HAVE EXPERIENCE CLUNKING SHIFTS BOTH IN THE UP SHIFT AND DOWN SHIFT, TYPICALLY AT LOWER SPEEDS. THERE ARE TIMES WHEN THE TRANSMISSION SHIFTS GEARS IT PROPELS THE VEHICLE FORWARD IN A JERKING FASHION, VERY SIMILAR TO A REAR END FENDER BENDER. THE LAST TIME I TOOK MY VEHICLE TO THE DEALERSHIP, I WAS TOLD THAT THE VEHICLE IS SHIFTING AT NORMAL SPECS AND IF IT KEEPS ACTING UP, TO BRING IT BACK WHEN IT IS MORE CONSISTENT. THE VEHICLE'S WARRANTY RUNS OUT IN A FEW MONTHS. | Crash: No Fire: No | 27,000 |
| Mar 2021 | ENGINE | TL* THE CONTACT OWNS A 2018 GMC SIERRA 1500. THE CONTACT STATED THAT A COOLANT SMELL WOULD EMIT FROM THE VEHICLE UPON EXIT. THE CONTACT ALSO STATED THAT HIS VEHICLE HAD BEGAN TO LOSE COOLANT AT AN ABNORMAL RATE AND HAD TO BE FREQUENTLY REPLACED. THE CONTACT TOOK THE VEHICLE TO MCCONNELL AUTOMOTIVE (3150 DAUPHIN ST, MOBILE, AL 36606) WHERE THEY CONFIRMED THAT THERE WAS A CRACK IN THE RADIATOR WHICH RESULTED IN A COOLANT LEAK. HE WAS ALSO INFORMED THAT THERE WAS NO RECALL ON THE VIN AND THAT THE WARRANTY DID NOT COVER THE REPAIR. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE AND PROVIDED THE SAME INFORMATION AS THE DEALER. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS APPROXIMATELY 42,000. | Crash: No Fire: No | 42,000 |
| Feb 2021 | ENGINE | THE RADIATOR IS LEAKING COOLANT WITHOUT ANY REAL CAUSE AND I WAS TOLD THE ENTIRE RADIATOR NEEDS TO BE REPLACED. | Crash: No Fire: No | 64,000 |
| Dec 2020 | POWER TRAIN,UNKNOWN OR OTHER | AFTER COLD STARTS WHEN ACCELERATING THE TRANSMISSION SLIPS FROM 1ST TO 2ND AND THROWS YOUR BODY FORWARD. AFTER THAT FIRST GEAR CHANGE IT DOESN'T DO IT AGAIN UNTIL ANOTHER COLD START. AROUND 34000 MILES I AM GETTING A RUMBLING VIBRATION THROUGH THE DASH AND STEERING WHEEL WHEN HOLDING SPEED BETWEEN 35-75 MPH. THE RPM GUAGE WILL JUMP SLIGHTLY AND IT WILL FEEL LIKE GOING OVER RUMBLE STRIPS. ACCELERATION IS VERY WEAK AT TIMES. SOMETIMES ITS OK. THERE HAS TO BE SOMETHING DONE WITH THESE TORQUE CONVERTERS AND TRANSMISSIONS BY GM. UNACCEPTABLE FOR A 40-50K DOLLAR TRUCK! | Crash: No Fire: No | 34,000 |
| Dec 2020 | ENGINE | I HAVE HAD MY GMC SIERRA 1500 FOR ALMOST 3 YEARS. I HAVE A LITTLE UNDER 59,000 MILES ON THE TRUCK. A FEW THOUSAND MILES AGO A TECH AT THE GM DEALER LET ME KNOW THAT THEY HAD TO ADD SOME COOLANT AND IT WAS SOMETHING I SHOULD KEEP AN EYE ON. I BROUGHT THE VEHICLE BACK TO HAVE THEM LOOK INTO IT. THEY LET ME KNOW THAT THE RADIATOR HAS A SMALL LEAK. IT IS NOT BIG ENOUGH TO HAVE FLUID HIT THE GROUND IN MY GARAGE BUT IT IS LOOSING FLUID. I LOOKED ONLINE AND SAW THAT THIS IS A COMMON ISSUE. I WAS TOLD THAT IT WAS NOT COVERED UNDER WARRANTY AND IT WOULD COST A GOOD AMOUNT TO FIX. I HAVE HAD THIS VEHICLE FOR UNDER 3 YEARS AND HAVE HAD 5 ISSUES WITHOUT ANY OF THEM BEING COVERED BY WARRANTY. THIS VEHICLE SEEMS TO BE A LEMON. | Crash: No Fire: No | 58,500 |
| Dec 2020 | ENGINE | TL* THE CONTACT OWNS A 2018 GMC SIERRA 1500. THE CONTACT STATED THAT WHILE DRIVING AT VARIOUS SPEEDS, THE TEMPERATURE GAUGE INDICATED THAT THE VEHICLE WAS OVERHEATED. NO WARNING LIGHT WAS ILLUMINATED. THE VEHICLE WAS TAKEN TO BECK & MASTEN BUICK GMC NORTH (11300 FM 1960 WEST, HOUSTON, TX 77065, (877) 380-8433) WHERE IT WAS DIAGNOSED AND DETERMINED THAT THE RADIATOR WAS LEAKING COOLANT AND THAT THE RADIATOR NEEDED TO BE REPLACED. COOLANT WAS REFILLED IN THE VEHICLE. THE DEALER CONTACTED THE MANUFACTURER FOR ASSISTANCE WITH REPAIRS. THE FAILURE MILEAGE WAS APPROXIMATELY 47,000. | Crash: No Fire: No | 47,000 |
| Nov 2020 | POWER TRAIN | HAVE BEEN TO DEALER 3 TIMES TRANSMISSION RUFF/SLIPPING ON 1-2 SHIFT | Crash: No Fire: No | 23,000 |
| Oct 2020 | POWER TRAIN | TRUCK SHIFTS HARD FROM 1ST TO 2ND GEAR AND VICE VERSA. WHEN DOWN SHIFTING FROM 2ND TO 1ST IT FEELS AS IF YOU GET REAR ENDED BY ANOTHER VEHICLE. IT SHIFTS HARD WHEN SWITCHING BETWEEN DRIVE AND REVERSE WITH AN AUDIBLE "CLUNK" AND JERKING ON THE TRUCK. | Crash: No Fire: No | 10,000 |
| Oct 2020 | POWER TRAIN | HESITATION WHEN ENGINE IS COLD SHIFTING FROM REVERSE TO DRIVE. SOME SHIFT IS SO HARD THAT IT FEELS LIKE BEING HIT FROM BEHIND. TOOK TRUCK TO DEALERSHIP TO CORRECT THE PROBLEM. THEY PERFORMED THE TSB 18-NA-355. THIS DID NOT CORRECT THE PROBLEM. DEALERSHIP ADVISED THERE WAS NOTHING ELSE THEY COULD DO ABOUT THIS ISSUE. | Crash: No Fire: No | 29,000 |
| Sep 2020 | POWER TRAIN,ELECTRICAL SYSTEM,SERVICE BRAKES | THE FIRST THING THAT HAPPENED WAS THAT ALL OF THE ELECTRICAL SYSTEMS ON MY TRUCK WENT OUT AND MY TRUCK WOULD NOT START. IT FINALLY STARTED BUT IT WOULD NOT MOVE FINALLY IT WOULD MOVE BUT VERY SLOWLY THIS HAPPENED ON 11/20/2019 I HAVE DOCUMENTATION THROUGH ONSTAR FOR THIS INCIDENT. MY BRAKES STARTED SLIPPING ON 07/01/2020 AND STILL DO NOT WORK PROPERLY. MY TRANSMISSION HAS NEVER SHIFTED CORRECTLY. WHEN I ACCELERATE OR WHEN I SLOW DOWN THERE IS A SHUDDER AND A JERKING SOUND. AFTER SITTING FOR A WHILE WHEN MY TRUCK IS PUT IN REVERSE IT HESITATES AND THEN SEEMS TO JUMP INTO GEAR. | Crash: No Fire: No | 27,000 |
| Sep 2020 | ENGINE,FUEL/PROPULSION SYSTEM | AFTER LONG PERIODS OF RUNNING AND IDLE, VEHICLE STALLS OUT HAS A HARD TIME RESTARTING. GAS PADDLE BEING PRESS HELPS SOMETIMES. CHECK CODE P2635 PLUS OTHERS (RANDOM SECONDARY CODES), COME ON. THIS HAS TAKEN PLACE IN AZ WHERE THE AMBIENT AIR TEMPERATURE TYPICALLY IS OVER 100. VEHICLE HAS BEEN TO GM DEALER WHO SAYS ITS VAPORIZING THE FUEL IN THE LINES. TSB PIP5507B DOSE NOT INCLUDE 2018, HOWEVER THE DESIGN HASN'T CHANGED. CONDITIONS; LONG IDLE, HOT WEATHER, LOW SPEEDS UNDER 25 MPH OR IDLE. LOCATION; AZ SONRONA DESSERT, OFF-ROAD, JOBSITE, CITY STREETS. | Crash: No Fire: No | 35,692 |
| Sep 2020 | POWER TRAIN | THE TRANSMISSION FAILED AT 32,000 MILES SLIPPED SO BAD COULD HARDLY DRIVE IT HOME ON HIGHWAY I95 JACKSONVILLE FLORIDA. FINALLY GOT A DEALER APPOINTMENT AFTER OVER 2 WEEKS OF WAITING WITHOUT THE USE THE VEHICLE. THEY REPLACED THE FLUID AND SAID IT WAS NOW GOOD. STILL TENDS TO SLIP I ASKED WHY THEY WERE NOT REPLACING THE WHOLE UNIT SAID NO NEED AS MY WARRANTY IS ALMOST UP? | Crash: No Fire: No | 32,000 |
| Sep 2020 | POWER TRAIN | HARD SHIFTING THAT STARTED AROUND 40000 MILES AND HAS PROGRESSIVELY GOTTEN WORSE. THE SAME THING HAPPENED TO MY 2017 CHEVROLET SILVERADO 1500 AND AT 90000 MILES THAT VEHICLE'S #3 SENSOR IN THE TRANSMISSION FAILED. IT APPEARS THIS VEHICLE IS ON THE SAME PATH. THE TRANSMISSIONS IN THESE VEHICLES ARE TRASH. IT HAPPENS IN LOWER GEARS. | Crash: No Fire: No | 60,800 |