2020 Gmc Sierra: Is It Reliable?
Problems, Recalls & Buyer Verdict
Used GMC SIERRA shoppers should review this model-year complaint and recall record before making an offer. Current data includes 500 complaints, with Engine Problems as the top reported area.
2020 Gmc Sierra Fuel Economy
✓ EPA Official DataEPA-rated fuel economy across 8 2020 Gmc Sierra trim configurations. The median figure is shown; range reflects all available trims.
Source: EPA FuelEconomy.gov. Figures reflect EPA lab testing; real-world results vary by driving style, load, and conditions. 8 trims analysed.
Based on NHTSA complaint data, the 2020 Gmc Sierra has 500 owner complaints, 14 crash-related complaints, and 16 recall campaigns on record. The most frequently reported component is Engine Problems. NHTSA reliability signal: Notable Issues.
- Make
- Gmc
- Model
- Sierra
- Model year
- 2020
- NHTSA owner complaints
- 500
- Crash-related complaints
- 14
- Safety recall campaigns
- 16
- Top reported component
- Engine Problems
- Reliability signal
- Notable Issues
- EPA MPG combined
- 20
- EPA MPG city / highway
- 19 / 22
- Fuel type
- Regular Gasoline
Most Common 2020 Gmc Sierra Problems
Top owner-reported complaint areas and where they often appear.
Engine Problems
Transmission / Drivetrain
Electrical Faults
Complaint patterns center on Engine Problems, Transmission / Drivetrain, Electrical Faults. Use these as a pre-purchase inspection guide, then verify recall and damage history on the specific VIN.
Should You Buy a Used 2020 Gmc Sierra?
This GMC SIERRA year shows a meaningful number of reported issues, so buyers should only proceed after a careful records review and inspection.
Model-year complaint trends can reveal recurring trouble spots before you spend money on inspections, financing, or repairs.
May Suit
This year may suit buyers who prioritize complete maintenance records and pass a pre-purchase inspection.
May Want to Avoid
Buyers who want a lower-risk ownership profile may prefer comparing nearby model years before committing.
What to Check Before Buying a Used 2020 Gmc Sierra
Inspection Focus
- Inspect the most frequently reported complaint components on this model year
- Confirm recall repairs were completed and documented
- Check for accident damage, title brands, and mileage inconsistencies on the exact VIN
Before You Close the Deal
- Run a VIN check on the specific vehicle you are considering
- Verify all open recalls are completed at nhtsa.gov/recalls
- Request service records for the most-reported complaint components
- Have a certified mechanic inspect the vehicle before purchase
Shortlist with model-year data. Decide with the exact VIN.
Before buying a used 2020 Gmc Sierra, run a VIN history report to verify accidents, title brands, odometer records, theft checks, and open recalls for the exact vehicle.
What the Complaint Data Suggests
Editorial interpretation of NHTSA public complaint data. Source: nhtsa.gov. Complaints are owner-submitted and do not confirm a defect. Methodology
The GMC SIERRA has 500 NHTSA complaints and 16 recalls on record. 14 complaints involve crash-related incidents. This data reflects owner-reported issues submitted to the National Highway Traffic Safety Administration.
Recall context: 16 recall campaigns are on record, so recall completion status should be confirmed on the exact VIN before purchase.
- 500 total complaints filed with NHTSA
- 16 federal recall campaigns
- 14 crash-related complaints on record
- Review NHTSA complaint history for the most-reported components
- Check recall completion status at nhtsa.gov/recalls
- Verify service records for frequently complained components
All 2020 Gmc Sierra Complaints by Category
Every owner-reported complaint category filed with NHTSA for the 2020 Gmc Sierra. Use this as a pre-purchase inspection checklist.
| Component | Complaints | Crashes | Fires | Avg Mileage | Volume |
|---|---|---|---|---|---|
| Engine Problems | 229 | 1 | 2 | — | |
| Transmission / Drivetrain | 119 | 4 | — | — | |
| Electrical Faults | 82 | — | 4 | — | |
| Brake System | 58 | 2 | 1 | — | |
| Uncategorized Issues | 54 | 1 | — | — | |
| Steering Defects | 35 | 1 | — | — | |
| Fuel/Propulsion System | 29 | 1 | — | — | |
| Structural Problems | 21 | — | 3 | — | |
| Forward Collision Avoidance: AEB | 20 | — | — | — | |
| Suspension Failures | 17 | — | — | — | |
| Unintended Acceleration | 13 | 1 | 1 | — | |
| Visibility/Wiper | 13 | — | 1 | — | |
| Airbag Malfunctions | 8 | 7 | 1 | — | |
| Tire Issues | 7 | — | — | — | |
| Lane Departure | 6 | — | — | — | |
| Back Over Prevention | 5 | — | 1 | — | |
| Hydraulic | 3 | — | — | — | |
| Headlight/Taillight Failures | 3 | — | — | — | |
| Parking-Brake Issues | 3 | — | — | — | |
| Visibility | 3 | — | — | — | |
| Wheel Issues | 3 | — | — | — | |
| Electronic Stability Control (Esc) | 2 | — | — | — | |
| Fuel System | 2 | — | — | — | |
| Diesel | 2 | — | — | — | |
| Equipment | 1 | — | — | — | |
| Seat Belt Issues | 1 | — | — | — | |
| Traction Control System | 1 | — | — | — | |
| Door Lock Issues | 1 | — | — | — | |
| Air | 1 | — | — | — |
Source: NHTSA Complaints Database. Complaint counts may exceed total complaints because one report can span multiple categories.
Real Owner Complaints
Read what owners actually reported to NHTSA for the 2020 Gmc Sierra. Type a keyword (e.g. “transmission”, “stalling”, “brakes”) to filter.
A known problem with these trucks is ground strap failure. I was driving and all the sudden lost power steering which almost caused an accident. There is a customer satisfaction program N252515590 that covers 2019-2024 trucks but mine was not included in this for some reason. I …
Sitting at a red light and when the light turned green, the engine made a noise and lost power while trying to cross the intersection. The check engine light came on along with some other lights. It was then towed to a mechanic and the engine had to be replaced due to failure …
2020 GMC Sierra 1500 began experiencing a slight knocking sound - mechanic diagnosed as a crankshaft issue. As of last night, 5/10, the truck's knocking sound got extremely loud, the exhaust pipe emitted smoke, and the truck began "bucking." No warning messages or lamps appeare…
6.2L V8 engine. 2020 build, GMC Sierra 1500 series. Same engine in the existing recall for 2021-2024 models. Received a call from the service department of the dealership that after changing the oil and restarting the truck to reset the oil change indicator the engine shut down. …
Complete engine failure with 62,500 miles. Truck appears to have the same problem as the 21-2024 which is currently recalled and engines are being exchanged.
We heard a knocking noise and took the truck to the nearest GM dealership. The engine had to be taken apart. The engine is a L87 6.2 liter V8. The GM dealership service department diagnosed camshaft damage that caused lifter failure. We have since been informed that GM has kn…
On 6/27/22 my 2020 gmc sierra 1500 at4 6.2L had lifter failure. The dealer fixed that problem and on 7/1/22 again has lifter failure. The dealer fixed that problem again. On 7/13/22 a third time engine had lifter failure again. I requested they need a different engine to be inst…
I’m scared to drive my vehicle because of the 6.2L V8 ongoing engine failures! I believe it to be unsafe for travel never knowing when the engine will fail. Now with over 1 Million failures of this engine!
The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle decelerated to 30 MPH. The check engine warning light was illuminated. The vehicle was taken to a local dealer, where it was diagnosed, and determined that the timi…
Driving on highway, engine light came on with many warning lights. Was just starting on a trip to SC then OH to help father for a surgery. Lifters went bad within fist 5-6k miles on the truck (6.2L) causing other damage to the engine such as bent rods (etc). Dealer repaired al…
My 2020 GMC Sierra 6.2L (only 46,000 miles which is under warranty mileage criteria), suffered catastrophic engine failure while at 40 miles per hour out of no where and rolled without power for about ~60ft. Power came back on, and I was able to get closer to the dealership but a…
I took my 2020 GMC Sierra in for an oil change. The engine seized when it the technician tried to restart the car. We had it towed to GMC where they confirmed the engine seized. The oil repair shop then replaced the engine and when doing so confirmed the original threw a rod whic…
The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed 60 miles away from home, the vehicle lost automotive power and stalled. The contact stated that the vehicle started smoking. Several unknown warning lights were illuminated. The…
After owning this truck a little over a year I’ve had to replace the transmission and now it’s in the because the motor sounds like a bag of marbles was put in it and the warranty company is a joke they only want to replace just the cam and lifters but yet the dealership hasn’t b…
While driving on the highway, my engine failed unexpectedly and I had to coast across the highway without power. I had the vehicle towed to a GM dealership, where I was informed the failure was due to a lower-end engine issue and that a full engine replacement was necessary. I a…
There is a click/ticking noise when vehicle is started. Noise gets louder and faster when accelerating. Have taken vehicle to 2 mechanic shops and been told by both places it is bad lifters and exhaust manifolds. I took this truck in because of loss of power. This issue has put m…
The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle went into LIMP Mode, and several unknown warning lights were illuminated. The vehicle lost automotive power. The vehicle was taken to the dealer to be diagnosed. Th…
Infotainment screen is flashing different colors and doesn’t work anymore.
When the truck was idling the dod/afm turned on and disabled a cylinder and now I’m just having codes pop up for cylinder misfires
The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving on several occasions at various speeds, the vehicle started shaking and slipped in and out of gear, with the message "Idle Transmission" displayed. The vehicle was pulled over and shifted into park(P) …
Source: NHTSA Complaints Database. Real owner reports for the 2020 Gmc Sierra.
2020 Gmc Sierra Recalls
16 campaignsNHTSA recall campaigns for the 2020 Gmc Sierra. 16 recall campaigns are on record, so recall completion status should be confirmed on the exact VIN before purchase. Recalls are free to fix at authorized dealers, but completion status must be verified on the exact VIN.
2020 Gmc Sierra Buying FAQ
Buyer-focused answers based on real NHTSA complaint and recall data for this model year.
Is the 2020 Gmc Sierra reliable?▾
Notable Issues. NHTSA currently shows 500 owner complaints, 14 crash-related complaints, and 16 recall campaigns for this model year. This GMC SIERRA year shows a meaningful number of reported issues, so buyers should only proceed after a careful records review and inspection. Treat this as a model-year signal, then verify the exact vehicle's condition and history before purchase.
What are the most common problems with the 2020 Gmc Sierra?▾
#1: Engine Problems (229 complaints). #2: Transmission / Drivetrain (119 complaints). #3: Electrical Faults (82 complaints)
At what mileage do problems start on the 2020 Gmc Sierra?▾
Mileage data is not available or insufficient for this model year.
How safe is the 2020 Gmc Sierra?▾
Complaint data is not the same as crash-test scoring, but it does highlight possible risk patterns. For the 2020 Gmc Sierra, NHTSA complaints include 14 crash-related reports and 7 fire reports out of 500 total complaints. 17 injury reports are also on file. For controlled crash-test ratings, check nhtsa.gov/ratings.
Does the 2020 Gmc Sierra have any recalls?▾
Yes. 16 NHTSA recall campaigns affect the 2020 Gmc Sierra. A major recall area is LATCHES/LOCKS/LINKAGES:HOOD:LATCH. 16 recall campaigns are on record, so recall completion status should be confirmed on the exact VIN before purchase. Always verify open recalls by VIN because completion status varies by vehicle.
Should I buy a 2020 Gmc Sierra?▾
This GMC SIERRA year shows a meaningful number of reported issues, so buyers should only proceed after a careful records review and inspection. Model-year complaint trends can reveal recurring trouble spots before you spend money on inspections, financing, or repairs. Pay extra attention to Engine Problems during inspection. Before committing, run a VIN history report to verify accidents, title brands, odometer records, and recall completion for the exact car.
Source: NHTSA (National Highway Traffic Safety Administration) complaint and recall databases, aggregated by VinSpector AI.
Wider context: See the full Gmc Sierra reliability report with year-by-year comparison.
Owner Reliability Rating
Rate the 2020 Gmc Sierra based on your ownership experience.
Add your rating:
Ratings are based on owner experience and are separate from NHTSA data shown above.
Check the Exact Vehicle History Before You Buy
Model-year complaints and recalls reveal patterns. A VIN report confirms whether the exact car has accident history, title brands, mileage issues, or open recalls.