2020 GMC Sierra suspension problems
moderate 13 complaints filed with NHTSA · avg repair $900 · see suspension across all vehicles →
The failure pattern owners describe
Owners of the 2020 GMC Sierra report widespread front suspension failures, primarily in upper and lower ball joints. The most severe: wheels separating from the vehicle at 37,000–45,000 miles during normal driving, some incidents occurring at city speeds. One owner's front passenger wheel assembly folded completely under the truck; others found wheels hanging by lower connections only. A dealership service technician told one owner they'd seen multiple right-side failures linked to leveling kits, but the manufacturer declined to investigate.
Clunking and grinding noises start as early as 8,000 miles when hitting bumps, and continue despite dealer repairs including spacer bushings and rebalancing. One truck returned to the shop three times within 3,000 miles with the same clunking, eventually exhibiting rear-end wobble at highway speed.
Rear suspension instability has also been reported—fishtailing at 60 mph in wet conditions and a "death wobble" in the rear at low mileage. One Denali shows excessive ball joint play at just 37,000 miles, well below typical component lifespan. A separate incident involved tied rod and wheel hub failures on both sides within a short period at 90,000 miles.
Leaf spring concerns are also noted, with one truck sitting noticeably nose-up even when empty and progressively lower when loaded, despite carrying only modest weight. Multiple warning lights (ESC, traction control, brake, check engine) accompany some suspension events, though their relationship to suspension failure isn't always clear. Owners emphasize the crash risk inherent in wheel separation, especially at highway speeds.
Same GMC Sierra suspension reports on nearby years: 2017
Failure modes owners describe
Upper control arm ball joint failure and wheel separation
Upper ball joints on the front suspension have fractured or separated prematurely, causing partial or complete wheel separation from the vehicle. Owners report the entire wheel assembly folding under the vehicle, wheel hanging by lower connections only, or wheel separating entirely. Failures occur at relatively low mileages and often without warning.
When: 41,000 miles, 37,061 miles, and other cases; some failures reported within first 15,000 miles of ownership
Symptoms owners cite: Clunking or grinding sound when hitting bumps; Wheel wobbling or feeling off-balance; Sudden violent shaking while driving; Vehicle dropping or lurching; Wheel pulling to one side; Brake hose severance due to wheel assembly folding
Codes mentioned: Service ESC, Service traction control, Brake light warning, Check engine light
Repairs/costs cited: Dealer service identified issues with front passenger side wheel suspension. One owner reported GMC dealership confirmed they had been seeing multiple failures, especially on the right side, attributed to leveling kits. Replaced upper control arm ball joints and spacer bushings at 8,482 and 11,000 miles; clunking noise returned. Cost information not provided by owners.
Recalls/TSBs owners mention: NHTSA Campaign Number 21V718000 (Suspension) exists; however, owner reported their vehicle with 41,000-mile failure was explicitly stated as NOT included in this campaign. GMC's 'Product Allegation' department refused to investigate one case. No other manufacturer responses documented.
Rear suspension fishtailing and instability
Rear suspension has exhibited instability causing the vehicle to fishtail, particularly in wet conditions or on rough pavement. One owner reported a 'death wobble' in the rear end at 8,482 miles when rear suspension components vibrated excessively.
When: At 68,000 miles and at 8,482 miles
Symptoms owners cite: Fishtail to the right at highway speed (60 mph) in rain or on rough asphalt; Rear end wobbling; Vehicle requiring driver correction to control
Repairs/costs cited: No repairs documented for rear suspension instability. One owner reported weights were added to wheels for balancing, but rear suspension concerns were not addressed.
Lower ball joint wear and play
Front lower ball joints are exhibiting premature wear with excessive play that exceeds manufacturer specifications. At 37,061 miles on a Denali, ball joints show wear levels typically expected at much higher mileages. Both left and right lower ball joints affected.
When: 37,061 miles
Symptoms owners cite: Excessive vertical and lateral play in ball joints; Play exceeding manufacturer's maximum allowable wear specifications
Repairs/costs cited: Inspection documented but no repair details provided by owner.
Tie rod end and wheel hub failure
Front suspension tie rod ends and wheel hubs have failed, causing wheel instability. Owner reported both driver and passenger side failures occurring in close succession on the same vehicle.
When: Approximately 90,000 miles, with two separate failures occurring close together
Symptoms owners cite: Front wheel instability; Loss of vehicle control potential
Repairs/costs cited: Driver side tie rod and wheel hub required repair; passenger side tie rod and hub failed shortly after and vehicle had to be towed. Specific repair costs and parts replaced not documented.
Leaf spring failure or degradation
Rear leaf springs show signs of failure or excessive wear. Dealer service indicated 'possible overloading,' though owner states the heaviest load was a 4,000 lb fishing boat. Vehicle sits lower in the rear than front when empty, and sits even lower with trailer attached, causing headlight aim problems.
When: Reported at unspecified mileage; inspection occurred on 9/24/21
Symptoms owners cite: Leaf spring degradation visible on inspection; Vehicle sitting lower in rear than front; Vehicle height decreases excessively with trailer load; Headlight aim problems due to vehicle posture
Repairs/costs cited: Dealer recommended air bags to level truck. No repair completed by time of complaint.
Electrical and drivetrain warning lights with suspension events
Multiple warning lights (Service ESC, Service traction control, brake light warning, check engine, service emissions system) have illuminated in conjunction with suspension stability events or independently. One transmission fluid warning light was illuminated despite adequate fluid present.
When: At approximately 68,000 miles and during wet-field driving after tire change at dealership
Symptoms owners cite: Service ESC warning light; Service traction control warning light; Brake light warning illuminated; Check engine light illuminated and flashing; Service emissions system warning; Transmission fluid warning light without low fluid condition
Codes mentioned: Service ESC, Service traction control, Brake light warning, Check engine light, Service emissions system
Repairs/costs cited: Independent mechanic diagnosed electrical systems failure. Transmission was replaced one year prior to reported failure. No permanent repairs documented for warning light issues.
Synthesized from 13 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 0 most recent
Common questions
How serious is the suspension problem on the 2020 GMC Sierra?
It's a documented issue but not catastrophic. 13 complaints have been filed. Repairs average $900 and most owners catch it before it causes a breakdown.
At what mileage does the suspension typically fail?
Based on the 13 complaints filed, suspension issues most often appear around 36,983 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $900 for suspension repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to suspension?
No active recalls currently cover suspension issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.