The P2490 code indicates that the engine control module has detected a voltage signal below the normal operating range on the EGR cooler bypass valve control circuit for Bank 2. This typically signifies an electrical short to ground or a failed solenoid.
The internal coil of the EGR cooler bypass valve solenoid has shorted or failed, causing low voltage detection.
Chafed, melted, or damaged wiring in the control circuit is touching the vehicle chassis or engine block.
Moisture or corrosion in the electrical connector has created a high-resistance path or a bridge to ground.
A blown circuit fuse may be cutting power to the solenoid, though this often affects multiple components.
An internal failure in the engine control module's driver circuit for the bypass valve.
No, P2490 is an electrical circuit code. It refers to the valve that bypasses the cooler, not the cooling efficiency or physical blockage of the cooler itself.
It is highly unlikely that the PCM is the cause. Most P2490 cases are resolved by repairing damaged wiring or replacing the faulty solenoid.
Yes, the vehicle will typically remain drivable, but it may operate in a 'limp' mode regarding emissions, leading to poorer efficiency.