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 |
|---|---|---|---|---|
| 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 | 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 |
| 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 |
| 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 |
| May 2020 | ENGINE | ENGINE LIKE KEEPS COMING ON. CODE READING THE KNOCK SENSOR NEEDS TO BE REPAIR. SENSOR HAS BEEN REPLACE TWICE IN THE PAST THREE MONTHS. *TR | Crash: No Fire: No | 6,000 |
| Apr 2020 | ELECTRICAL SYSTEM | REVIEW CAMERA IS EXTREMELY BRIGHT WHEN BACKING. IT'S SO BRIGHT THAT A GLARE IS THROWN ONTO REAR WINDOW MAKING IT NEXT TO IMPOSSIBLE TO SEE OUT REAR WINDOW OR USE SIDE VIEW MIRRORS. I OFTEN REVERT TO TO OPEN DRIVERS DOOR AND LOOKING BACKWARDS THAT WAY. SOMEONE IS GOING TO GET RUN OVER AS YOU CANNOT SEE WHERE YOU ARE BACKING. VERY DANGEROUS! | Crash: No Fire: No | 15 |
| Mar 2020 | SERVICE BRAKES | THE ABS SYSTEM FAILED WHILE DRIVING DOWN THE ROAD CAUSING THE BRAKES TO LOCK UP AND CAUSED THE TRUCK TO SPIN OUT OF CONTROL NEARLY CRASHING INTO ANOTHER VEHICLE AND JUMPING OVER THE CENTER DIVIDE INTO ONCOMING TRAFFIC. | Crash: Yes Fire: No | 4,395 |
| Feb 2020 | STEERING,ELECTRONIC STABILITY CONTROL (ESC),SERVICE BRAKES | I WAS GOING ABOUT 15 MILES PER HOUR WHEN SUDDENLY ALL THESE ERROR CODES STARTED POPPING UP, FIRST "ESC MALFUNCTION" THEN TRAILER BRAKE MALFUNCTION,STABILITRAK, STEERING ASSIST REDUCED, BRAKE SYSTEM FAIL, LIGHS JUST POP UP I DO FEEL LIKE THE TRUCK LOOSES SOME POWER FEELS MORE SLUGGISH, I TOOK IT TO DEALERSHIP, THEY RECALIBRATED THE BREAK SYSTEM AND STUFF, IT FIXED THE ISSUE TEMPORARILY, BUT THE LIGHTS KEEP COMING BACK, SOMETIMES I TURN THE TRUCK ON IN THE MORNING AND LIGHTS ARE GONE, THEN LATER ON I GET ALL THE ERROR CODES AGAIN WHILE DRIVING IT. IT STARTED 4 DAYS AFTER I PURCHASED THE TRUCK AND HAPPENS DAILY SINCE. | Crash: No Fire: No | 300 |
| Feb 2020 | SERVICE BRAKES | 2020 GMC 6.2 L V8 1500 4W SIERRA DENALI. BOUGHT YESTERDAY NEW FROM DEALERSHIP. TODAY, NOT EVEN 120 MILES AND BRAKES MALFUNCTIONED. I STARTED TRUCK WITH GMC APP. GOT IN CAR WITH MY FAMILY AND AS I PULLED OUT OF PARKING STALL PUSHING ON BRAKES MET EXTREME RESISTANCE AND SLUGGISHLY CAME TO A STOP. I PUT TRUCK IN PARK. SHUT OFF AND TURNED BACK ON. BRAKES STILL NOT FUNCTIONING. 'BRAKES' 'ABS' AND ICONS FOR TRACTION CONTROL AND CHECK ENGINE LIGHTS WERE ON. AGAIN ATTEMPTED TO DRIVE. DRIVING 20 MPH WOULD TAKE GREATER THAN 50 YARDS TO STOP, WITH ME, 220# ATHLETIC MALE APPLYING FULL FORCE. WARNING MESSAGE ALSO APPEARED 'BRAKE SYSTEM FAILURE MAX SPEED 62 MPH'. NO IDEA WHERE 62 WAS FORMULATED. ALSO SOME MESSAGE ABOUT TRAILER BRAKES CAME ON TOO. NO TRAILER WAS ATTACHED. I SHUT TRUCK OFF. 30 MINUTES LATER STARTED, CHECK ENGINE LIGHT WAS ONLY LIGHT ON. BRAKES WORKED NORMAL. WAS ABLE TO CAUTIOUSLY GET 3 MILES HOME. THIS IS A POTENTIALLY FATAL FLAW. AGAIN THIS TRUCK IS STRAIGHT OFF THE DEALERS LOT. ONSTAR SENT EMAIL STATING 'ISSUE WITH ANTILOCK BRAKING SYSTEM, TAKE TO DEALERSHIP WITHIN 7 DAYS '. SO BRAKE FAILURE IS A MAJOR ISSUE. BUT ALSO A KNOWN BRAKE ISSUE AND THE COMPUTERS SAY STAY BELOW 62 MPH AND GET SERVICED WITHIN 7 DAYS ARE JUST AS WORRISOME. A BRAKING ISSUE SHOULD INSTRUCT DON'T DRIVE AND HAVE TOWED THANKS | Crash: No Fire: No | 120 |
| Feb 2020 | ELECTRICAL SYSTEM,ENGINE | SMELL OF SMOKE STRONG IN THE CAB AND OUTSIDE HOOD OF TRUCK. ALSO HAVE SEEN SMOKE COMING FROM HOOD OF TRUCK. SMELLS LIKE BURNING ELECTRICAL OR PLASTIC | Crash: No Fire: No | 168 |
| Feb 2020 | SERVICE BRAKES | VEHICLE WAS PARKED. ENTERED VEHICLE AND TURNED ON VEHICLE USING INTERIOR START BUTTON. VEHICLE WAS PUT IN REVERSE AND WAS BAKING WHEN ALL BREAK PRESSURE DISAPPEARED AND VEHICLE WAS ROLLING BACKWARD AND CAME TO A STOP BEFORE STRIKING ANOTHER VEHICLE AND CHILD. VEHICLE WAS PLACED IN PARK AND ESC FAILURE, TRAILER BRAKE FAILURE, TRACTION CONTROL FAILURE, POWER STEERING FAILURE AND DO NOT DRIVE ABOVE 62 MHP ALARMED ON THE DASH. VEHICLE WAS SHUT OFF AND ON 3 TIMES AND RESET FINALLY REGAINED SOME BREAK PRESSURE BUT CHECK ENGINE LIGHT CAME N. VEHICLE WAS TOWED TO TRENT GMC, NEW BERN NC FOR SERVICE. SERVICE TOLD US IT HAD A RECALL. I WAS UNABLE TO LOCATE A RECALL FOR THIS ISSUE. THIS COULD HAVE ENDED VERY BAD. I AM NOT ASSURED THAT THE PROBLEM IS FIXED. | Crash: No Fire: No | 1,950 |
| Feb 2020 | ELECTRICAL SYSTEM,EXTERIOR LIGHTING,UNKNOWN OR OTHER | BRAND NEW TRUCK. STUCK AT THE GYM IN THE MIDDLE OF THE NIGHT TRUCK WONT START. THE INTERIOR LIGHTS, HEAD LIGHTS, AND RADIO WONT SHUT OFF. VEHICLE WONT START. I'M ASSUMING THE BATTERY WAS DRAINED BECAUSE INTERIOR LIGHTS, EXTERIOR LIGHTS, RADIO, WONT SHUT OFF. HAS TO BE SOME KIND OF ELECTRICAL MALFUNCTION. WAITING ON GM ROADSIDE. | Crash: No Fire: No | 144 |
| Feb 2020 | POWER TRAIN | THE TRUCK RANDOMLY GETS STUCK IN PARK. CANNOT PUT IT INTO DRIVE, NEUTRAL OR REVERSE. THE CAR HAS BEEN AT THE DEALERSHIP SINCE JANUARY 27, 2020. GMC WONT SEND THEM THE PART, THE DEALSHIP BELIEVES IT MUST BE A PROBLEM WITH THE PART AND THEY ARE TRYING TO FIX OR REDESIGN THE PART BEFORE ITS SENT OUT. ALSO I WAS TOLD BY MY DEALERSHIP ANOTHER 2020 AT4 CAME IN WITH THE SAME PROBLEM. IT WAS TOWED TO THEM. | Crash: No Fire: No | 250 |
| Jan 2020 | SERVICE BRAKES | TL* THE CONTACT OWNS A 2020 GMC SIERRA 1500. THE CONTACT STATED THAT WHILE DRIVING AT 52 MPH, THE BRAKE PEDAL WAS DEPRESSED BUT WAS VERY FIRM. THE PARK BRAKE WAS ACTIVATED BUT FAILED TO EFFECTIVELY STOP THE VEHICLE. THE VEHICLE WAS COASTED TO A PARKING LOT AND WAS PUT IN PARK. THE BRAKE SYSTEM FAILURE LIGHT, THE ABS AND SEVERAL OTHER WARNING LIGHTS ILLUMINATED. THE VEHICLE WAS TOWED TO THE BAKER BUICK GMC OF CHARLESTON DEALER, LOCATED AT 1621 SAVANNAH HWY, CHARLESTON, SC 29407) WHERE THE VEHICLE WAS KEPT FOR A DIAGNOSTIC TEST. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE AND STATED THAT THE FAILURE WAS A KNOWN ISSUE AND REFERRED THE CONTACT TO THE DEALER. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS APPROXIMATELY 7,020. THE VIN WAS NOT AVAILABLE. | Crash: No Fire: No Towed | 7,020 |
| Jan 2020 | UNKNOWN OR OTHER | THE BACKUP CAMERA IS ENTIRELY TOO BRIGHT AT NIGHT. IT IS NEARLY IMPOSSIBLE TO SEE THE MIRRORS DUE TO THE BRIGHTNESS | Crash: No Fire: No | 1,000 |
| Dec 2019 | EXTERIOR LIGHTING | WHEN MAKING RIGHT TURNS IN THE DARK THE HEADLIGHTS DO NOT CAST LIGHT TO THE RIGHT SO YOU CAN SEE WHERE YOU ARE TURNING. THIS IS ESPECIALLY A PROBLEM IN THE RURAL WITHOUT STREETLIGHTS IT IS TOTALLY BLACK FROM THE DRIVERS SEAT LOOKING OVER THE RIGHT SIDE OF THE HOOD OR OUT THE RIGHT WINDOW. | Crash: No Fire: No | 1,500 |