Coolant bypass valve failure and engine overheating
ENGINE
69 NHTSA complaints · 2024-06 → 2026-05 (sample of 200 most-recent of 865 total)
“"Engine Maintenance Required Visit Your Dealer" warning that would not clear for a defective coolant bypass valve. No way to know that this was the issue without taking the vehicle to the dealer. Car began to overheat presenting a danger when driving distances to myself and…”
“In September 2023 I kept getting a warning on my 2019 Toyota RAV4 saying “engine maintenance required”. My car had roughly 50,000 miles. I was not due for an oil change and I serviced my vehicle regularly. I tried to take it to autozone to read the code but nothing came up and…”
“A warning message appeared that stated: “Engine maintenance required - Visit your dealer”. At that time my vehicle had 38,796 miles on it. I contacted the Service Advisor at Toyota of Newnan who advised that it was likely the Coolant Bypass Valve on the engine and that they…”
“2019-2023 model year Toyota RAV4s and Toyota Corollas are equipped with defective coolant bypass valves prone to premature failure which can cause coolant to leak out of a vehicle’s closed-loop coolant system, harming its ability to properly regulate engine temperature. This…”

