"How reliable is the 2021 Gmc Sierra 2500?"

"Based on 56 NHTSA complaints, the 2021 Gmc Sierra 2500 has a median complaint mileage of 51248 miles. The most common issue is Power Train."

"What are common problems with the 2021 Gmc Sierra 2500?"

"The most frequently reported component in NHTSA complaints for the 2021 Gmc Sierra 2500 is Power Train, accounting for a significant portion of the 56 total complaints filed."

2021 Gmc Sierra 2500: Reliability Data

Source: NHTSA — 56 complaints

Total Complaints

51,248mi

Median Mileage

Power Train

Top Issue

Crash Reports

When Do Complaints Happen?

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

23,900 25th Percentile

51,248 Median Mileage

66,850 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

Power Train

Exterior Lighting

Electrical System

Engine

Service Brakes

Body

Latches/Locks/Linkages

Unknown Or Other

Air Bags

Warnings

Severity Assessment

Crashes

Fires

Injuries

Deaths

Sample Complaint Reports

"THE TRUCK IS PARKED AT DEALERSHIP"

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 10 complaints

25th: 49,250 mi Median: 64,000 mi 75th: 92,000 mi

Engine 6 complaints

Median: 55,000 mi

Where Are Complaints Coming From?

Top states by complaint count.

MI: 10 TX: 5 FL: 5 CA: 5 NV: 3 TN: 3 PA: 3 MA: 3 VA: 2 WI: 2

Gmc Sierra 2500 — Other Years

See how this model compares across different model years.

Year	Complaints	Median Mileage	Top Issue	Crashes
1999	42	100,000	Service Brakes	3
2000	62	91,500	Service Brakes, Hydraulic	4
2001	171	66,500	Service Brakes, Hydraulic	19
2002	164	85,000	Service Brakes	13
2003	193	76,000	Service Brakes, Hydraulic	8
2004	175	60,000	Service Brakes	4
2005	159	58,483	Electrical System	5
2006	78	42,000	Service Brakes	4
2007	98	70,000	Air Bags	5
2008	77	71,800	Air Bags	6
2009	37	39,200	Electrical System	1
2011	81	57,000	Air Bags	2
2012	39	70,000	Air Bags	1
2013	57	60,000	Unknown Or Other	2
2014	39	39,500	Unknown Or Other	4
2015	100	34,289	Exterior Lighting	7
2016	75	25,000	Steering	2
2017	50	18,060	Service Brakes	4
2018	43	10,000	Engine	0
2019	38	25,458	Electrical System	0
2020	106	20,450	Power Train	1
2022	48	15,167	Electrical System	1
2023	34	33,000	Power Train	1
2024	118	7,000	Electrical System	3
2025	27	-	Steering	3

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