2016 Kia Sorento: Loose head bolts leading to engine failure
Common wear/failure (not a recall)
Symptoms
Owners of the 2016 Sorento report: loose head bolts leading to engine failure. CarComplaints.com lists 5 owner complaints, average mileage 107,800 miles.
NHTSA has 720 owner complaints for the 2016 Sorento in this area. Examples:
- NHTSA complaint ODI #11772503 (filed 10/20/2026): “I am the original owner of a 2016 kia sorento and have lived at my original registration address since purchasing the vehicle. the engine suddenly and catastrophically failed/seized due to internal rod bearing failure. the local kia dealership is denying the r…”
- NHTSA complaint ODI #11772433 (filed 10/20/2026): “The contact owns a 2016 kia sorento. the contact stated that there was coolant intrusion into the engine. the failure was associated with technical service bulletin: 253 (rev 1, wty035 - warranty extension program). the contact stated that the issue was caused…”
Likely causes
Sources do not establish a single root cause; diagnosis is needed. Owner-reported fixes are listed below.
Fix, in plain English
Most common owner-reported solutions on CarComplaints.com: replacement of lower block or replacement of entire engine (5 reports). Check for open recalls and extended warranty coverage with a dealer before paying out of pocket.
DIY difficulty: Pro
Internal engine work (lifters, oil consumption, fuel dilution diagnosis) requires engine teardown or dealer software/tests. (Our assessment.)
Cost
CarComplaints.com owners report a typical repair cost of about $10,800 (owner-reported average, not a quote).
Typical parts (search links, no affiliate codes)
AutoZone · O'Reilly · Advance · RockAuto
Sources
- CarComplaints.com: Loose head bolts leading to engine failure (2016 Sorento)
- NHTSA complaints API, 2016 Sorento
Page last updated .