2020 Chevrolet Suburban: Power Train complaints
Owner-reported issue (NHTSA complaints, not a recall)
Symptoms
NHTSA has 10 owner complaints for the 2020 Chevrolet Suburban that list the power train component. Complaints are individual owner reports, not verified defects.
Examples:
- NHTSA complaint ODI #11704286 (filed 12/10/2025): “Transmission is not functioning properly at 74,300 miles. engine kept slipping while driving uphill and the rpms were not matching vehicle speed. could not go above 50mph while merging onto freeway which was very dangerous. whirring noise occurred every time i accelerated which was also noted by dea…”
- NHTSA complaint ODI #11698085 (filed 11/07/2025): “Our engine went at 100,800 miles, costing us $15k in june 2025. then our transmission went 3 months later, now costing us another $7k. gm is offering very little financial assistance. it's quite inconvenient that these major mechanical issues occur right after factory warranty. it is at a dealer get…”
- NHTSA complaint ODI #11693940 (filed 10/16/2025): “Driving through residential area and noticed loud noise from under hood. went to pull out onto state highway and wasn’t able to get up to speed almost causing an accident because i could not accelerate. had to maintain speed at or below 40mph. brought vehicle to dealership and they confirmed that th…”
Likely causes
These complaints do not establish a single root cause; read the examples above and get a diagnosis.
Fix, in plain English
No single fix is established by these reports. Check your VIN for open recalls at nhtsa.gov/recalls, ask a dealer about technical service bulletins (TSBs) or extended warranty coverage, then have the system diagnosed.
DIY difficulty: Pro
Diagnosis needs a scan tool; repair or replacement needs a lift, transmission jack and the manufacturer's fluid fill/relearn procedure. (Our assessment.)
Cost
No sourced cost range for this issue. Get a written quote after diagnosis.
Typical parts (search links, no affiliate codes)
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Sources
Page last updated .