2020 Chevrolet Suburban: Engine complaints
Owner-reported issue (NHTSA complaints, not a recall)
Symptoms
NHTSA has 18 owner complaints for the 2020 Chevrolet Suburban that list the engine component. Complaints are individual owner reports, not verified defects.
Examples:
- NHTSA complaint ODI #11760183 (filed 08/27/2026): “In 2025, one if the pistons misfired. it was repaired and the same issue occurred a year later causing the cam shaft to break as well. not to mention we had an electrical failure where the dashboard didn’t work and the water pump failed right after it was in for the first piston misfiring. it was re…”
- NHTSA complaint ODI #11759329 (filed 08/25/2026): “Engine had a catastrophic failure and completely shut off while driving down the highway. the engine has completely seized and requires replacement. the vehicle was towed to an independent service shop and the technician diagnosed that the engine needed to be replaced.…”
- NHTSA complaint ODI #11754702 (filed 08/04/2026): “There is a safety recall on gm’s 6.2l v8 l87 engine model years 2021-2024. my vehicle is a 2020 suburban with a 6.2l v8 l87 engine. my engine recently experienced the same failure as cited in the recall, but because it is outside the 2021-2024 window it is not covered by this recall. i ask that the …”
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
Internal engine work (lifters, oil consumption, fuel dilution diagnosis) requires engine teardown or dealer software/tests. (Our assessment.)
Cost
No sourced cost range for this issue. Get a written quote after diagnosis.
Typical parts (search links, no affiliate codes)
AutoZone · O'Reilly · Advance · RockAuto
Sources
Page last updated .