The P2424 code indicates that the hydrocarbon (HC) adsorption catalyst on Bank 2 is operating below a minimum efficiency threshold. This component is designed to trap hydrocarbons during cold-start conditions to reduce emissions before the primary catalytic converter reaches operating temperature.
The catalyst material has physically deteriorated or become contaminated, losing its ability to adsorb hydrocarbons.
A leak in the exhaust manifold or piping near the catalyst allows outside air to enter, skewing sensor readings.
A malfunctioning sensor on Bank 2 may report incorrect hydrocarbon levels, triggering a false efficiency code.
Unburned fuel from a misfire can overload the catalyst, leading to premature failure or temporary efficiency drops.
An error in the engine control module's processing of sensor data, though this is statistically rare.
It is highly unlikely. P2424 is almost always caused by a physical failure of the catalyst, a sensor error, or an exhaust leak; replacing the PCM is rarely the correct solution.
Yes, the vehicle is typically drivable, but it will fail emissions tests and may produce higher pollutant levels during cold starts.
Not necessarily. This code specifically refers to the HC adsorption catalyst, which is a separate function or component used for cold-start emissions management.