Complaint volume
425 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
2020 GMC Sierra Complaints
425 consumer-submitted complaints on record for the 2020 GMC Sierra, grouped by component category.
425 Total complaints
11 Crash reports
4 Fire reports
6 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 engine, power train, electrical system. Use those categories as a test-drive checklist instead of judging the vehicle from the total count alone.
Severity flags
Enriched records include 11 crash reports, 4 fire reports, 6 injury reports, and 0 fatality reports. These fields come from complaint records and should be read in context.
Mileage clue
Mileage is available on 118 complaints, with an average reported failure mileage of 44,233 miles. Compare that with the mileage on the listing.
Questions to ask the seller
- Have you had any problems related to engine, power train, electrical system?
- 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 2020 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.
2020 GMC Sierra
Build buyer checklist Compare with other years Sends year, make, and model to pre-fill your checklist.
How severe are the 2020 GMC Sierra complaints?
11 Crash
4 Fire
6 Injury
0 Fatality
28 Towed
4 Medical attention
What are the most common 2020 GMC Sierra complaint categories?
ENGINE 125
POWER TRAIN 36
ELECTRICAL SYSTEM 21
POWER TRAIN,ENGINE 17
SERVICE BRAKES 16
STEERING 14
UNKNOWN OR OTHER 14
ENGINE AND ENGINE COOLING 9
SUSPENSION 9
ELECTRICAL SYSTEM,ENGINE 8
425 total complaints on record
Latest complaints
| Date | Component | Summary | Severity | Mileage |
|---|---|---|---|---|
| Feb 2021 | ELECTRICAL SYSTEM | TL* THE CONTACT OWNS A 2020 GMC SIERRA 1500. THE CONTACT STATED WHILE DRIVING, THE SIDE VIEW MIRROR'S BLIND SPOT ALERTS ON BOTH SIDES ENGAGED WITH NO VEHICLE NEARBY. THE VEHICLE WAS TAKEN TO TURNER BUICK GMC (612 E MAIN ST, NEW HOLLAND, PA 17557) WHERE THE CONTACT WAS INFORMED THAT THE SENSORS WERE DIRTY. THE CONTACT THEN WASHED THE VEHICLE HOWEVER, THE FAILURE RECURRED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER HAD NOT BEEN INFORMED OF THE FAILURE. THE FAILURE MILEAGE WAS APPROXIMATELY 400. THE VIN WAS NOT AVAILABLE. *BF | Crash: No Fire: No | 400 |
| Feb 2021 | TIRES | TL* THE CONTACT OWNS A 2020 GMC SIERRA 1500 EQUIPPED WITH BRIDGESTONE TIRES, TIRE LINE: ALENZA A/S 02, TIRES SIZE: 275/50/R22, DOT NUMBER: UNKNOWN. THE CONTACT STATED THAT THE TIRES FAILED TO HOLD THE TIRE PRESSURE. THE VEHICLE WAS TAKEN TO SCENIC CHEVROLET BUICK GMC CADILLAC (2300 ROCKFORD ST, MT AIRY, NC 27030) WHERE THE VEHICLE WAS PURCHASED. THE TECHNICIAN ADDED NITROGEN GAS INTO THE TIRES HOWEVER, THE FAILURE PERSISTED. THE CONTACT STATED THAT A LETTER WAS SENT TO THE MANUFACTURER HOWEVER, THERE WAS NO RESPONSE. THE FAILURE MILEAGE WAS 2,976. *JS *JS | Crash: No Fire: No | 2,976 |
| Feb 2021 | STEERING | THE STEERING WILL COMPLETELY LOCK UP, THIS IS THE 2ND OCCURRENCE. IT WAS AT THE DEALER 1143 MILES AGO AND CODES WERE CLEARED, PROBLEM REOCCURRED. I WAS ABLE TO START THE VEHICLE, PUT IN DRIVE/REVERSE NEUTRAL ETC WITHOUT ISSUES, HOWEVER THE STEERING WAS COMPLETELY LOCKED UP AND WOULD NOT ALLOW STEERING/CONTROL OF THE VEHICLE. THE VEHICLE WAS PARKED IN DRIVEWAY, COLD OUTSIDE BOTH TIMES. I HAVE VIDEO EVIDENCE. THE FIRST OCCURRENCE 12/26/2020 AT 9591 MILES, 2ND OCCURRENCE 2/16/2021 AT 10733 MILES (1142 MILES LATER) | Crash: No Fire: No | 10,733 |
| Feb 2021 | VISIBILITY/WIPER | WHILE DRIVING ON A STATE HIGHWAY, I HEARD A "POP" SOUND, I SAW NOTHING CONTACT THE VEHICLE, BUT I THEN NOTICED THE WINDSHIELD WAS CRACKED. THE WINDSHIELD CRACKED FOR NO APPARENT REASON.. | Crash: No Fire: No | 27,540 |
| Feb 2021 | ENGINE | AT ABOUT 3500 MILES LIFTERS ON TWO CYLINDERS COLASPED. TOOK TO DEALER THAT DEALER HAD THREE WEEKS BUT FIXED IT. 1500 MILES LATER AT 5036 MILES IT HAPPENED AGAIN ON A DIFFERENT CYLINDER. NUMBER 8. THE FIRST TIME IT WAS 3 AND 5. THE FIRST TIME THE DEALER REPLACED ALL 8 CYLINDERS. SO CYLINDER NUMBER 8 WAS NEW AS WELL. GMC HAS SAID THERE IS NOTHING ELSE THAT CAN BE DONE TO FIX THE ISSUE. THE SECOND DEALER SERVICE MANAGER STATES THAT HE WOULD NOT TRUST IT EITHER TO GO ANY LONG DISTANCE . ALSO STATED THAT THEY HAVE PUT 3 SETS IN TO ONE VEHICLE BEFORE. AS AN ASE MASTER CERTIFIED TECHNICIAN I FIND THIS DISTURBING. I ALSO WAS A GMC,PONTIAC, OLDSMOBILE MASTER TECHNICIAN. THIS IS UNEXCEPTABLE FOR GM TO THINK THIS IS OK TO TAKE PEOPLE'S HARD EARN MONEY AND NOT FIX THERE ISSUES OR MAKE IT RIGHT. I OWNED A 2014,2016,2018 SILVERADO'S THAT HAD NO ISSUES WHAT SO EVER. TO MAKE THINGS WORST GMC ROAD SIDE ASSISTANCE FORGOT ABOUT THE TRUCK BROKE DOWN IN 7 DEGREE WEATHER WITH 35 MILE AN HOUR WINDS. FOR OVER 24 HOURS AND SEVERAL CALLS BACK TO FINALLY GET A SUPERVISOR TO SPEAK TO. TWO DEALERS SAY THAT IT IS UNACCEPTABLE EXCEPT THE CURRENT DEALER THAT IS DEALING DIRECTLY WITH GMC. ANYONE CAN DO A SEARCH ON GM TRUCK LIFTERS COLLAPSING AND YOU IMMEDIATELY OVERWHELMED WITH INFO. IT IS ALSO DISTURBING THAT A DEALERSHIP SERVICE MANAGER SAYS WE COULD PUT A NEW ENGINE IN AND THE SAME THING COULD HAPPEN. THAT TO ME IS POOR QUALITY CONTROL AND POOR CUSTOMER SERVICE. I HAVE ALWAYS BEEN A GM ENTHUSIASTS BUT THIS WILL BE MY LAST ONE. HORRIBLE CUSTOMER SERVICE AND DO NOT BUILD A GOOD PRODUCT OR STAND BEHIND IT. GM SHOULD BE ASHAMED OF THERE FALL FROM GRACE. THIS ALL HAPPENED JUST DRIVING ONCE TO WORK AND ONCE HAULING A ATV ON A TRAILER. | Crash: No Fire: No | 5,036 |
| Feb 2021 | VISIBILITY/WIPER | WIPERS FROZE TO WINDSHIELD WHILE DRIVING WITH DEFROSTER ON MAX. DESIGN OF THE WINDSHIELD AND DASH MEANS WIPERS SIT LOWER THAN WHERE THE DASH AND WINDSHIELD MEET, AND NO WARM AIR FROM THE DEFROSTER CAN GET TO THE WINDSHIELD WHERE THE WIPERS SIT. THERE IS NO IN WINDOW DEFROSTER (LIKE REAR WINDOW) WHICH CAN HELP. MAJOR SAFETY ISSUE IN SNOW/ICE CONDITIONS. | Crash: No Fire: No | 5,400 |
| Jan 2021 | ENGINE,LANE DEPARTURE,FORWARD COLLISION AVOIDANCE | WITHIN 3 MONTHS (<4000 MILES) FROM PURCHASE VEHICLE BEGAN SPUTTERING WITH HESITATION, AND TICKING NOISE FROM ENGINE WHILE IN MOTION FOLLOWED BY MULTIPLE ALERTS POSTING ON DRIVER DISPLAY. VEHICLE DISPLAYS LOSS OF POWER, AND STRUGGLES TO KEEP UP WITH TRAFFIC. CHECK ENGINE LIGHT FLASHING FOLLOWED BY CONSTANTLY STAYING ON, SERVICE ESC SYSTEM ACTIVATED, SERVICE PARKING BRAKE, AND STEERING ASSIST REDUCED DRIVE WITH CAUTION LIGHTS ALL ACTIVATED DURING THIS EPISODE. DEALER WORKED ON VEHICLE ENGINE ( AND COMPLETED ON OR AROUND 1/08/2021), AND REPLACED LIFTERS, AND OIL CONTROL VALVE. ON 01/13/2021 NOTICED THAT VEHICLES LANE KEEP ASSIST IS NOW WORKING SPORADICALLY, WILL NOT ACTIVATE CONSISTENTLY WHEN VEHICLE VEERS OFF THE PROPERLY MARKED LANES ON HIGH-WAY/ROADS, AND INCONSISTENTLY ALERTS DRIVER WHILE IN MOTION. THE LANE KEEP ASSIST IS SUPPOSE TO CORRECT STEERING, BUT THIS DOES NOT HAPPEN CONSISTENTLY. THE COLLISION ALERT SYSTEM DOES NOT ACTIVATE OR WORK CORRECTLY. NOTICED WHILE DRIVING THAT VEHICLES IN FRONT ARE NOT DETECTED CORRECTLY, AND INFORMS THE DRIVER THEY ARE WITHIN SAFE DISTANCE (GREEN THIS SUDDENLY CHANGES TO YELLOW). IN ADDITION WHEN VEHICLES IN FRONT APPLY BRAKE, THE COLLISION ALERT SYSTEM DOES NOT ALERT AS IT IS SUPPOSED TO, IT STAYS IN GREEN EVEN AT EXTREMELY CLOSE RANGE. SAFETY MECHANISMS DON'T APPEAR TO WORK CORRECTLY, AND DETECTS ITEMS THAT ARE NOT PRESENT. NOTICED THAT VEHICLE DETECTS LANES EVEN ON UNMARKED ROADS, AND THE FRONT PEDESTRIAN ALERT SYSTEM ACTIVATES SPORADICALLY EVEN IF NO PEDESTRIANS ARE IN FRONT OF VEHICLE WHILE DRIVING. CONCERNED ABOUT SAFETY FEATURES LEADING TO HAZARDOUS DRIVING CONDITIONS. | Crash: No Fire: No | 3,800 |
| Jan 2021 | STEERING,ELECTRICAL SYSTEM | ON DECEMBER 14, 2020 MY SIERRA WITH 2339 MILES DISPLAYED, AT STARTUP, THE POWER STEERING WAS OUT, TO DRIVE WITH CARE. ALSO DISPLAYED SERVICE ESC AND TRACTION CONTROL FAILURES. I DROVE WITH MUCH DIFFICULTY, WITHOUT POWER STEERING, TEN MILES TO THE NEAREST GMC DEALERSHIP, LAFONTAINE IN HIGHLAND, MI. I PICKED UP THE VEHICLE ON DECEMBER 29, 2020 WITH AN ADDITIONAL 60 MILES. THE SERVICE PERSONNEL SAID THEY WERE UNABLE TO DUPLICATE THE PROBLEM, THEREFORE NO REPAIRS WERE MADE. LAFONTAINE HAD CONTACTED GENERAL MOTORS TECH CENTER WHO OFFERED NO SOLUTIONS OTHER THAN CHECKING THE BATTERY AND WIRING HARNESS CONNECTIONS. THE PROBLEM HAS NOT REAPPEARED IN THE FIFTEEN DAYS SINCE I PICKED UP MY VEHICLE. | Crash: No Fire: No | 2,339 |
| Jan 2021 | ELECTRICAL SYSTEM | [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6). *TR | Crash: No Fire: No | 9,000 |
| Jan 2021 | ENGINE,FORWARD COLLISION AVOIDANCE | THE ENGINE FAILED AT 5100 MILES AND IS CURRENTLY BEING REPAIRED BY THE DEALERSHIP. I REQUESTED A NEW CAR REPLACEMENT. | Crash: No Fire: No | 5,100 |
| Dec 2020 | POWER TRAIN,SERVICE BRAKES | CAR WAS IDLING AND PARKED. WARNING CODE SHOWED UP ON DASHBOARD ESC, ELECTRONIC STABILITY CONTROL, REDUCED ENGINE POWER. VEHICLE THEN DISPLAYED TRANSMISSION DISRUPTION, WARNING LIGHT DISPLAYED AS WELL. I WAS ABLE TO DRIVE IT TO THE DEALERSHIP BUT THE PERFORMANCE OF THE VEHICLE WAS LIMITED BY THE REDUCED ENGINE POWER. TRANSMISSION WAS HESITATING AND CLUNKY DURING GEAR CHANGES. MY SIERRA HAS 5,000 MILES ON IT AND THE TRANSMISSION WAS ALREADY REPLACED AT 2,000 MILES. GMC HAS A SERIOUS PROBLEM WITH THIS MAKE AND MODEL. UNSURE WHAT THE RESOLUTION WILL BE, BUT I AM NO LONGER CONFIDENT IN THE PRODUCT GMC IS SELLING. | Crash: No Fire: No | 5,000 |
| Dec 2020 | AIR BAGS | TL* THE CONTACT OWNS A 2020 GMC SIERRA 1500. THE CONTACT STATED THAT WHILE DRIVING APPROXIMATELY 35 MPH THE DRIVER LOST CONTROL OF THE VEHICLE AND DROVE OFF THE ROAD AND DOWN AN EMBANKMENT BEFORE CRASHING TO THE GROUND. DURING THE CRASH THE VEHICLE SUSTAINED SEVERE DAMAGE TO THE FRONT END BUT THE AIR BAGS DID NOT DEPLOY. THE DRIVER SUSTAINED HEAD AND SHOULDER INJURIES WHICH REQUIRED MEDICAL TREATMENT. THE VEHICLE WAS TOWED AWAY. NO POLICE REPORT WAS TAKEN. THE CAUSE OF THE FAILURE WAS NOT DETERMINED. THE LOCAL DEALER MAYSE EARNHARDT AUTO GROUP LOCATED AT 2032 S ELLIOTT AVE, AURORA, MO WAS NOTIFIED OF THE FAILURE. THE MANUFACTURER WAS NOT CONTACTED. THE FAILURE MILEAGE WAS 10,000. | Crash: Yes Fire: No Injuries: 1 Towed Medical attention | 10,000 |
| Dec 2020 | ELECTRICAL SYSTEM,SERVICE BRAKES | ON TWO SEPARATE OCCASIONS, THE TRUCK HAS BEEN DEAD WHEN ATTEMPTING TO CRANK. THERE WERE NO LIGHTS OR DEVICES LEFT ON AFTER THE PREVIOUS TIME THE TRUCK HAD BEEN USED. SOMETHING IS DRAWING POWER FROM THE BATTERY CAUSING IT TO BE DEAD. AFTER RECHARGING THE BATTERY, THE CHECK ENGINE CODES READ THAT THERE IS A PROBLEM WITH 'BRAKE LIGHT ILLUMINATION.' HELP IN DETERMINING WHA T IS CAUSING THE BATTERY TO DIE ON SUCH A NEW VEHICLE WOULD GREATLY APPRECIATED! I'M UNCERTAIN AT THIS TIME AS TO WHETHER OR NOT THE BRAKE LIGHT ILLUMINATION IS CAUSING A SAFETY HAZARD. | Crash: No Fire: No | 15,000 |
| Dec 2020 | ELECTRICAL SYSTEM,SERVICE BRAKES | AFTER HAVING ALL SORTS OF WARNINGS OVER TIME LIKE "SERVICE ESC," "SERVICE PARKING BRAKE," AND MORE, I NOW SEE "BRAKE SYSTEM FAILURE: 62 MPH TOP SPEED" FLASH ACROSS MY DASH. I AM READING AND HEARING THAT THIS IS A VERY DANGEROUS PROBLEM. NEW TRUCK. BRAND NEW. HAD IT LESS THAN A YEAR. BRAKE MESSAGE ALWAYS ON START UP. | Crash: No Fire: No | 6,400 |
| Dec 2020 | ELECTRICAL SYSTEM,ENGINE | THERE IS NO WAY TO PERMANENTLY DISABLE THE AUTO START STOP ON THE VEHICLE. SEVERAL OTHERS HAVE COMPLAINED ABOUT THIS, NO RESPONSE FROM GM. THERE NEEDS TO BE A FIRMWARE UPGRADE TO THE ECM TO ALLOW THE OWNER MAKE THE DECISION ON IF THAT IS ENABLED OR DISABLED. ON MINE, I HAVE TO PUSH A BUTTON EACH TIME I START THE ENGINE TO DISABLE THAT. SOME GM VEHICLES DON'T HAVE THAT OPTION. | Crash: No Fire: No | 2 |
| Nov 2020 | ENGINE | TL* THE CONTACT OWNS A 2020 GMC SIERRA 1500. THE CONTACT STATED THAT THE VEHICLE PUSH START BUTTON AND KEY FOB FAILED TO START THE VEHICLE ON FIRST ATTEMPT. THE CONTACT STATED THAT THE VEHICLE STARTED AFTER SEVERALS ATTEMPTED. THE CONTACT STATED THE FAILURE OCCURRED INTERMITTENTLY. THE CHECK ENGINE WARNING LIGHT ILLUMINATED. THE CONTACT STATED THAT ON HIS WAY TO MCKENZIE BUICK-GMC DEALER, 6500 CAROLINE ST, MILTON, FL 32570, THE CHECK ENGINE WARNING LIGHT WAS NOT ILLUMINATED, THE VEHICLE WAS DIAGNOSED AND THE CONTACT WAS INFORMED THAT A FAILURE CODE WAS NOT FOUND. THE VEHICLE WAS NOT REPAIRED. HOWEVER, THE CONTACT CALLED BACK THE SAME DEALER AND INFORMED THEM THAT THE FAILURE RECURRED. THE VEHICLE WAS NOT YET TAKEN BACK TO THE DEALER. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS APPROXIMATELY 86. | Crash: No Fire: No | 86 |
| Nov 2020 | ELECTRICAL SYSTEM,SEAT BELTS | KEEP GETTING "SERVICE SAFETY RESTRAINT SYSTEM " ALERTS. VEHICLE ONLY HAS 550 MILES. ALERTS ARE INTERMITENT WHEN DRIVING. CONTACTED THE DEALER AND WAS ADVISED THAT UNLESS IT REMAINS ON THEY COULD NOT TRACE THE ISSUE. | Crash: No Fire: No | 550 |
| Sep 2020 | VISIBILITY/WIPER | BACK UP CAMERA IS AWFUL AT NIGHT. THIS IS A SAFETY ISSUE BECAUSE YOU CANNOT SEE ANYTHING WHEN BACKING UP. MY TRUCK HAS 323 MILES ON IT AND I WENT TO DEALERSHIP THEY SAID I WOULD HAVE TO LIVE WITH IT. THAT IS NOT ACCEPTABLE TO HAVE A SAFETY FEATURE THAT IS FAULTY. | Crash: No Fire: No | 323 |
| Sep 2020 | ENGINE | VEHICLE EQUIPPED WITH L87 6.2L. AT 197 MILES ENGINE SUDDENLY CEASED OPERATING AND WOULD NOT RESTART. THIS OCCURRED WHILE STOPPED ON PRIVATE ROAD. VEHICLE HAD TO BE TOWED TO DEALERSHIP WHERE THEY FOUND P0300 AND DIAGNOSED BROKEN #4 CYLINDER EXHAUST VALVE SPRING. | Crash: No Fire: No | 197 |
| Sep 2020 | POWER TRAIN | TRANSMISSION KICKS WHEN COMING TO A COMPLETE STOP. | Crash: No Fire: No | 5 |
| Sep 2020 | STEERING,ELECTRICAL SYSTEM,SERVICE BRAKES | EVERYTHING WAS FINE FOR ABOUT 6 MONTHS AFTER HAVING PURCHASED VEHICLE AS NEW. THEN I GOT WARNING LIGHTS ASKING ME TO BOTH SERVICE THE PARKING BREAK AND SERVICE ESC WITH A WARNING THAT DRIVING WOULD BE COMPROMISED JUST OVER 60MPH. I NOTIFIED DEALER WHO SAYS THEY FIXED THE GLITCH BUT IT HAPPENED AGAIN. THE LAST TIME, MOST RECENTLY, I TRIED TO START THE TRUCK THE NEXT DAY AND ALL THE WARNING LIGHTS CAME ON. THIS WAS FOLLOWED BY A COMPLETE SHUT DOWN. NO ENGINE, NO LIGHTS - NOT EVEN LOCK/UNLOCK WITH KEY FOB. IT HAD TO BE TOWED. THIS IS A 2020 VEHICLE AND SEEMS LIKE IT WILL STRAND ME SOME PLACE AT THE VERY LEAST. AWFUL, EXPENSIVE, AND PERHAPS DEADLY DYNAMICS HERE. GMC, GET YOUR ACT TOGETHER. YOU OWE US IMMEDIATELY. PROVIDE THE FIX IMMEDIATELY OR GIVE ME MONEY BACK WITH NO CONTEST. | Crash: No Fire: No | 5,000 |
| Sep 2020 | ELECTRICAL SYSTEM | DISPLAY IS DANGEROUSLY TOO BRIGHT WHEN BACKING UP CANNOT SEE TO BACK UP VEHICLE SAFELY | Crash: No Fire: No | Unknown |
| Sep 2020 | ELECTRICAL SYSTEM | VEHICLE DOES NOT START AND FLASHING VARIOUS CODES SERVICE JUST ABOUT EVERYTHING ON THE VEHICLE | Crash: No Fire: No | 227 |
| Sep 2020 | ELECTRICAL SYSTEM | THE NIGHT TIME BACKUP CAMERA IS REALLY BRIGHT AND BLURRY AND IT MAKES IT HARD TO SEE WHEN BACKING AT NIGHT | Crash: No Fire: No | Unknown |
| Sep 2020 | ELECTRONIC STABILITY CONTROL (ESC),SERVICE BRAKES,ENGINE | MY 2020 GMC SIERRAS BRAKES FAILED ON MAY 22ND AND ECM AND NOW THE ENGINE AND TRANSMISSION ARE EXPERIENCING ISSUES BASED ON THE ONSTAR REPORT. | Crash: Yes Fire: No Towed | 11,000 |