Honda’s reputation for bulletproof four-cylinders may be taking a hit. A new class-action lawsuit filed in the United States alleges that certain 1.5- and 2.0-liter i-VTEC engines found in some of the brand’s most popular cars and crossovers are suffering from potentially serious defects, including overheating, head gasket failures, and even an increased risk of fire.
At the center of the complaint is the claim that head gaskets in these engines are prone to cracking under high compression and heat. Once that seal fails, coolant may leak into the cylinder head grooves, depleting the system and leaving the engine vulnerable to overheating or seizure. In more extreme scenarios, the plaintiffs argue, this chain of events could lead to engine fires.
Drivers have reportedly noticed warning signs such as white smoke from the exhaust—a telltale indicator of coolant entering the combustion chamber—and contaminated engine oil caused by coolant mixing in. Both issues can accelerate internal corrosion and, ultimately, engine failure.
The suit points to five vehicles equipped with these engines:
- 2018–2022 Honda Accord
- 2016–2022 Honda Civic
- 2017–2022 Honda CR-V
- 2021–2022 Acura RDX
- 2019–2022 Acura TLX
Six owners are named in the case, including five Accord drivers and one CR-V owner. All allege Honda has failed to adequately address the problem, with some claiming warranty coverage was denied despite ongoing issues.
Allegations of Cut-Short Lifespans
According to the filing, Honda’s four-cylinder engines should last at least 200,000 miles under normal conditions. The plaintiffs argue that, because of the alleged defects, these i-VTEC engines fall far short of that expectation. They are suing the automaker for breach of warranty, unjust enrichment, and violations of consumer protection laws, while also seeking damages, legal fees, and a jury trial.
Not the First Complaint
This isn’t Honda’s first time facing scrutiny over its 1.5-liter engines. In late 2024, a separate California lawsuit raised concerns about inadequate sealing and cooling, which could allow coolant to leak into the engine, dilute the oil, and cause overheating or power loss.
Honda has not yet issued a public response to the latest filing, and the automaker has not announced any recalls related to the allegations. For now, the case underscores the growing tension between Honda’s long-standing reputation for reliable powertrains and recent reports from owners who say their engines are failing far earlier than expected.
Source: Honda