2020 Chevrolet Blazer 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 211 complaints citing each category; one complaint can cite several. Full breakdown on the 2020 Chevrolet Blazer overview page.
What owners report
“Coolant temperature would not read, steering assist malfunctioning, air conditioner intermittent. Wiring harness for sensors loomed together with coil pack wiring interrupting signals.”NHTSA complaint 11655693 — filed 04/20/2025
“When putting the car in park the car donât recognize itâs in park cause the car to stay running.”NHTSA complaint 11648911 — filed 03/18/2025
“Cooling ran would never shut off, 'Steering Assist Reduced Drive with Care', the smell of sweet syrup (coolant), and the temp gauge would not leave…”NHTSA complaint 11647903 — filed 03/12/2025
Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.
Power Train complaints by year filed
Frequently asked questions
Does the 2020 Chevrolet Blazer have transmission & power train problems?
Power Train is the #2 most-reported problem area on the 2020 Chevrolet Blazer: 70 of 211 complaints on file (33.2%). Complaints are unverified owner reports, not confirmed defects.
How many complaints does the 2020 Chevrolet Blazer have in total?
211 complaints were on file with NHTSA as of 07/14/2026. Across all categories, 5 involved a crash, 0 involved a fire, 7 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.
