"How reliable is the 2020 Gmc Sierra 3500?"

"Based on 72 NHTSA complaints, the 2020 Gmc Sierra 3500 has a median complaint mileage of 28700 miles. The most common issue is Power Train."

"What are common problems with the 2020 Gmc Sierra 3500?"

"The most frequently reported component in NHTSA complaints for the 2020 Gmc Sierra 3500 is Power Train, accounting for a significant portion of the 72 total complaints filed."

2020 Gmc Sierra 3500: Reliability Data

Source: NHTSA — 72 complaints

Total Complaints

28,700mi

Median Mileage

Power Train

Top Issue

Crash Reports

When Do Complaints Happen?

Distribution of NHTSA complaints by vehicle mileage at time of report.

19,000 25th Percentile

28,700 Median Mileage

50,000 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

Power Train

Electrical System

Service Brakes

Unknown Or Other

Engine

Fuel/Propulsion System

Body

Tires

Steering

12V/24V/48V Battery

Severity Assessment

Crashes

Fires

Injuries

Deaths

Sample Complaint Reports

"VEHICLE EXHIBITS STEERING WHEEL SHAKE / SHIMMY AT SPEEDS ABOVE 50MPH, SOMETIMES SEVERE. REPEATED ATTEMPTS AT REPAIR (CURRENTLY 4 DEALER VISITS), INCLUDING APPLICATION OF SERVICE BULLETIN 19-NA-240 DOES NOT CORRECT THE PROBLEM. GM HAS NOW INDICATED THIS IS A "NORMAL" CONDITION, AND WILL NOT AUTHORI..."

"WHILE TOWING A FIFTH WHEEL CAMPER, THE EXHAUST WAS SO HOT IT MELTED THE CAMPER DIRECTLY BEHIND IT. WAS CAUGHT IN SIDE MIRROR BEFORE ANYTHING CAUGHT ON FIRE."

"PROGRESSIVE PAUSE STARTS WHEN STARTING VEHICLE. AFTER A FEW WEEKS OF PAUSE STARTING VEHICLE HAD NO POWER AT ALL. TOWED IT TO DEALER THEY REPLACED A BAD BATTERY. PAUSE START CONTINUED AND AFTER 4-5 WEEKS VEHICLE WOULD NOT START. COULDN'T TURN PARK BREAK OFF. THERE WAS POWER (LIGHTS IN DASH CAME ..."

Source: NHTSA ODI Complaints Database. Names and identifying details omitted.

When Were Complaints Filed?

Number of complaints by the year the issue occurred.

When Does Each Component Fail?

Median mileage at complaint for top components.

Power Train 19 complaints

Median: 108,000 mi

Where Are Complaints Coming From?

Top states by complaint count.

TX: 17 CO: 5 FL: 5 IA: 5 OR: 4 MN: 4 OK: 3 OH: 3 WA: 3 LA: 3

Who Files Complaints?

1.4%

Original Owners

98.6%

Second+ Owners

Gmc Sierra 3500 — Other Years

See how this model compares across different model years.

Year	Complaints	Median Mileage	Top Issue	Crashes
1999	25	60,000	Antilock/Traction Control/Electronic Limited Slip	1
2000	30	57,007	Service Brakes, Hydraulic	3
2001	44	61,580	Antilock/Traction Control/Electronic Limited Slip	3
2002	29	101,000	Service Brakes	3
2004	29	87,000	Service Brakes	0
2005	29	46,000	Service Brakes	0
2008	26	70,500	Air Bags	0
2011	24	97,500	Air Bags	0
2015	40	43,000	Exterior Lighting	1
2016	27	63,750	Service Brakes	0
2021	27	-	Power Train	0
2022	37	40,000	Electrical System	6
2023	34	79,000	Power Train	4
2024	58	20,000	Power Train	0

Data source: View this vehicle on NHTSA.gov | NHTSA ODI Complaints Database. Public domain.

Methodology: Complaint counts and mileage distributions are computed directly from consumer-reported NHTSA complaints. This data represents reported issues, not failure rates — vehicles without complaints are not represented. Full methodology.

Data through: 2026-03-28