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 |
|---|---|---|---|---|
| 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 |