2021 Chevrolet Suburban Transmission & Power Train Problems
NHTSA component category: POWER TRAIN · data through 07/14/2026
Source: U.S. NHTSA complaint data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.
How power train ranks on this vehicle
Share of the 178 complaints citing each category; one complaint can cite several. Full breakdown on the 2021 Chevrolet Suburban overview page.
What owners report
“The vehicle started rumbling/vibrating/shaking when getting up to speed and at a consistent speed. Brought to an independent service center and was old that the…”NHTSA complaint 11667883 — filed 06/19/2025
“While driving at normal highway speed, the vehicle speed is suddenly reduced and it feels and sounds like the transmission has shifted into low gear…”NHTSA complaint 11662243 — filed 05/20/2025
“Sat may 3rd We went for tire change from that date since that day, every time we try to start the car thereâs always a…”NHTSA complaint 11661849 — filed 05/19/2025
Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.
Power Train complaints by year filed
Frequently asked questions
Does the 2021 Chevrolet Suburban have transmission & power train problems?
Power Train is the #2 most-reported problem area on the 2021 Chevrolet Suburban: 34 of 178 complaints on file (19.1%). Complaints are unverified owner reports, not confirmed defects.
How many complaints does the 2021 Chevrolet Suburban have in total?
178 complaints were on file with NHTSA as of 07/14/2026. Across all categories, 6 involved a crash, 1 involved a fire, 5 reported injuries, and none reported deaths.
What does NHTSA's power train category include?
NHTSA groups complaints about the transmission (automatic or manual), driveline, axles, transfer case and related parts under a single component category called POWER TRAIN. This page reports that category as NHTSA defines it.
