Complaint volume
437 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
437 consumer-submitted complaints on record for the 2020 GMC Sierra, grouped by component category.
437 Total complaints
11 Crash reports
5 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, 5 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 121 complaints, with an average reported failure mileage of 45,188 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
5 Fire
6 Injury
0 Fatality
29 Towed
4 Medical attention
What are the most common 2020 GMC Sierra complaint categories?
ENGINE 130
POWER TRAIN 38
ELECTRICAL SYSTEM 22
POWER TRAIN,ENGINE 17
SERVICE BRAKES 16
STEERING 14
UNKNOWN OR OTHER 14
ENGINE AND ENGINE COOLING 10
SUSPENSION 9
ELECTRICAL SYSTEM,ENGINE 8
437 total complaints on record
Latest complaints
| Date | Component | Summary | Severity | Mileage |
|---|---|---|---|---|
| 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 | 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 | POWER TRAIN | TRANSMISSION KICKS WHEN COMING TO A COMPLETE STOP. | Crash: No Fire: No | 5 |
| 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 |
| Aug 2020 | STEERING,ELECTRONIC STABILITY CONTROL (ESC),ENGINE | PARKED TRUCK FOR ONE HOUR, ENGINE OFF. CAME BACK AND UPON STARTUP, RECEIVED MULTIPLE ERRORS THAT POWER STEERING AND ESC REQUIRED DEALER ATTENTION. BRAKE PEDAL WOULD DEPRESS TO FLOOR. GMC SIERRA 1500 ELEVATION TRIM | Crash: No Fire: No | 3,000 |
| Aug 2020 | ELECTRICAL SYSTEM,SERVICE BRAKES | ELECTRONIC ABS BRAKE FAILURE WITH 73 MILES ON ODOMETER WHILE STOPPED AT RED LIGHT ALARM CHIMES SOUNDED AND POWER BRAKES WERE LOST. WARNING LIGHTS ON DASH ABS BRAKE FAILURE MULTIPLE ENGINE WARNING LIGHTS CAME ON. DEALER SERVICE WAS PUZZLED NEEDED TO CONTACT GM TECHNICAL SUPPORT. FINAL OUTCOME THEY ARE REPLACING THE ELECTRONIC BRAKE MODULE. | Crash: No Fire: No | 73 |
| Aug 2020 | STEERING | TL* THE CONTACT OWNS A 2020 GMC SIERRA 1500. THE CONTACT STATED THAT THE VEHICLE WAS AT A STAND STILL IN A HOSPITAL PARKING LOT, WHEN THE STEERING WHEEL CEASED. THE CONTACT STATED THAT THE POWER STEERING ASSIST WARNING LIGHT WAS ILLUMINATED. THE VEHICLE WAS NOT DRIVABLE. THE VEHICLE WAS TOWED TO LOCAL DEALER PHILLIPS BUICK GMC LOCATED AT 2160 US-441 #27, FRUITLAND PARK, FL 34731, (352) 728-1212, HOWEVER THE MECHANIC WAS UNABLE TO DUPLICATE THE FAILURE. THE VEHICLE HAD NOT BEEN REPAIRED AS OF YET. THE MANUFACTURER HAD NOT BEEN INFORMED OF FAILURE. THE FAILURE MILEAGE WAS 1,000. THE VIN WAS NOT AVAILABLE. | Crash: No Fire: No Towed | 1,000 |
| Aug 2020 | POWER TRAIN,ELECTRICAL SYSTEM | AT 550 MILES HAD TO TOW TO DEALER. THEY SAID NEEDED TO REPROGRAM TRANSMISSION. NOW AT 4000 MILES, WENT TO START AND VEHICLE WILL NOT DO ANYTHING. NO POWER. IT IS BEING TOWED TO DEALER AGAIN. PRETTY MUCH BOUGHT A LEMON AS IT LOOKS NOW. | Crash: No Fire: No | 4,000 |
| Jul 2020 | ELECTRICAL SYSTEM | BATTERY WAS DEAD IN THE GARAGE. CALLED ROAD SIDE ASSISTANCE WHO JUMP-STARTED CAR. CAR WOULD NOT GO INTO GEAR. WE ROLLED IT OUT INTO DRIVEWAY WHERE IT SAT FOR 24 HOURS. WHEN IT WAS LOADED FOR TRAVEL TO DEALERSHIP, IT CRANKED AND WAS DRIVEN UP ON WRECKER TRAILER LIKE IT HAD NO APPARENT PROBLEMS. WAS CARRIED TO DEALERSHIP WHERE THEY RECHARGED AND CHECKED THE BATTERY AND RESET 14 DIFFERENT CODES WHICH WERE LOST WITH THE LOW VOLTAGE. | Crash: No Fire: No | 5,100 |
| Jul 2020 | ELECTRICAL SYSTEM | BRAND NEW TRUCK PURCHASED IN MAY 2020. VEHICLE WOULD NOT START ON 7/2/2020 AND A NEW BATTERY WAS PLACED IN THE VEHICLE. THE TRUCK WOULD NOT START AGAIN ON 7/17/2020 UNKNOWN REASONS... | Crash: No Fire: No | 3,500 |
| Jul 2020 | UNKNOWN OR OTHER | AFTER VEHICLE SITS IDLE FOR A WHILE, THE VEHICLE MAKES A HIGH PITCH WHISTLING SOUND ON STARTUP THAT LAST FOR APPROXIMATELY MINUTE OF DRIVING. | Crash: No Fire: No | 7,000 |
| Jul 2020 | STEERING | 2020 GMC SIERRA STEERING ISSUES. LOSS OF COMMUNICATION BETWEEN MODULES. RESULTS IN LOCKED STEERING OR NO POWER STEERING ASSIST. HAPPENS RANDOMLY AT VEHICLE START UP. BEEN TO THE DEALER FOUR TIMES SO FAR. THE FIRST TWO WAS INFORMED THERE'S NOTHING WRONG WITH IT. REPAIRS ATTEMPTED, UPDATE SOFTWARE, ENGINE HARNESS REPAIR, AND STEERING MODULE REPLACEMENT. | Crash: No Fire: No | 3,500 |
| Jun 2020 | EQUIPMENT,UNKNOWN OR OTHER | NAVIGATION STATES TO TURN RIGHT WHEN IT SHOULD BE LEFT OR VICE VERSA. THIS WAS A PROBLEM ON THE 2016-2017 MODELS ALSO. *TR | Crash: No Fire: No | 4,000 |
| Jun 2020 | STEERING,SERVICE BRAKES | TL* THE CONTACT OWNS A 2020 GMC SIERRA. THE CONTACT STATED THAT WHILE DRIVING AT 25 MPH, THE SYSTEM BRAKE FAILURE WARNING MESSAGE ILLUMINATED ON THE INSTRUMENT PANEL. ONCE THE WARNING LIGHT ILLUMINATED, THE CONTACT EXPERIENCED COMPLETE BRAKE AND STEERING FAILURE. THE CONTACT WAS ABLE TO STEER THE VEHICLE INTO A CURB TO SLOW DOWN THE VEHICLE AND AVOID A POSSIBLE COLLISION WITH ANOTHER VEHICLE. THE CONTACT STATED THAT HE HAD SUFFERED PAIN TO HIS LEFT SHOULDER BLADE AND LEFT KNEE; HOWEVER, HE DID NOT SEEK MEDICAL ATTENTION DUE TO COVID-19. AFTER EXPERIENCING THE FAILURE, THE CONTACT HAD THE VEHICLE TOWED TO DESERT SUN MOTORS, INC. (2600 N WHITE SANDS BLVD, ALAMOGORDO, NM 88310) WHERE THEY CLEARED THE SYSTEM'S COMPUTER AND INFORMED THE CONTACT THAT THEY FOUND NO DEFECTS WITH THE VEHICLE. UPON RETURN OF THE VEHICLE, HE EXPERIENCED ANOTHER BRAKE FAILURE AS THE CHECK ENGINE LIGHT ILLUMINATED WHILE DRIVING AT 55 MPH. DUE TO THE FAILURE, THE CONTACT WAS FORCED TO RUN A RED LIGHT AND DRIVE UP AN INCLINE IN ORDER TO BRING THE VEHICLE TO A COMPLETE STOP. THE VEHICLE WAS THEN TOWED SHAMALEY BUICK GMC (955 CROCKETT ST, EL PASO, TX 79922) WHERE IT REMAINED IN THEIR POSSESSION. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE AND A FIELD INSPECTOR WAS SENT TO INSPECT THE VEHICLE. THE CONTACT STATED THAT KNOW BRAKE FAILURE CODES WERE DETECTED. THE CONTACT STATED AFTER THE THIRD FAILURE THE VEHICLE WAS TOWED TO SHAMALEY GMC WHERE IT WAS AWAITING DIAGNOSIS. THE VEHICLE HAD YET TO BE REPAIRED. THE FAILURE MILEAGE WAS UNKNOWN. | Crash: No Fire: No Injuries: 1 Towed | Unknown |
| Jun 2020 | SUSPENSION,ELECTRONIC STABILITY CONTROL (ESC),SERVICE BRAKES | HIGHWAY DRIVING ENGINE LIGHT STARTED FLASHING, RECEIVED CODES ON SERVICE ESC AND SERVICE PARKING BRAKE. TRUCK SEEMED TO LOOSE POWER TRANSMISSION STARTED SHIFTING VERY HARD, CRUSE DISENGAGED,LANE KEEP ASSIST STOPPED WORKING , BRAKES AND STEERING SEEMED TO ACT DIFFERENT . WHEN IGNITION WAS TURNED OFF LOUD NOISES FROM UNDER TRUCK SOUNDED LIKE BRAKES RELEASING WITH LOUD CLUNKING NOISE. | Crash: No Fire: No | 1,950 |
| May 2020 | ENGINE | RUPTURED OIL COOLER LINE. DRAINING THE ENGINE OF OIL AND CAUSING LOCK-UP. *TR | Crash: No Fire: No | 120 |
| May 2020 | UNKNOWN OR OTHER | CAN NOT SEE ANYTHING BACKING UP IN THE DARK BECAUSE OF BACKUP CAMERA. THE PICTURE ON THE SCREEN IS GRAINY AND WASHED OUT SO ALL YOU SEE ARE BLOBS OF NOTHING. *TR | Crash: No Fire: No | 10 |