Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with a part of the car that helps control pollution. It's like a switch that isn't working right, and it's on the side of the engine that doesn't have cylinder number one.
The EGR (Exhaust Gas Recirculation) system helps reduce emissions by recirculating a portion of the exhaust gases back into the engine cylinders. The EGR cooler bypass control circuit manages the flow of these gases. A 'low' signal indicates an issue with this control circuit on Bank 2.
The P2490 code indicates that the EGR cooler bypass control circuit is reading a low voltage condition on Bank 2. This typically means that the signal from the EGR cooler bypass valve is lower than expected, possibly due to wiring issues, a faulty valve, or a problem with the control module.
• Check Engine Light is on
• Reduced engine performance
• Increased emissions
• Faulty EGR cooler bypass valve
• Wiring issues in the EGR control circuit
• Malfunctioning EGR control module
EGR: Exhaust Gas Recirculation
Bank 2: The side of the engine opposite to where cylinder number one is located
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage.
• Test the EGR cooler bypass valve for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the EGR cooler bypass valve if faulty.
• Reset the code and test drive to ensure the issue is resolved.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Ford F-150
• Chevrolet Silverado
• Dodge Ram 1500
• Regular maintenance of the EGR system
• Use quality fuel to reduce carbon buildup
• Perform periodic emissions checks
Engine Performance
• Avoid driving the vehicle for long distances until repaired.
• Monitor fuel efficiency and emissions performance.
Check with the vehicle manufacturer for warranty coverage on emissions-related components.
The P2490 code has been reported in vehicles with higher mileage, often due to wear and tear on EGR components.
Moderate – It should be addressed soon to prevent increased emissions and potential engine performance issues.
Driving with a faulty EGR system may lead to failing emissions tests and could be illegal in some regions.
• Engine at operating temperature
• Vehicle in closed-loop mode
The EGR cooler bypass valve is typically located near the exhaust manifold on Bank 2 of the engine.
Q: Can I drive with a P2490 code?
A: It's not recommended to drive for long periods with this code as it can affect emissions and engine performance.
Q: How can I prevent a P2490 code?
A: Regular maintenance and using quality fuel can help prevent issues with the EGR system.
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