P2420 Fault Code

Evaporative Emission System Switching Valve Control Circuit High

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2420 fault code indicates an issue with the Evaporative Emission System Switching Valve Control Circuit. This component plays a crucial role in managing fuel vapors and preventing them from escaping into the atmosphere, thereby reducing emissions. When this circuit experiences a high voltage issue, it can disrupt the operation of the valve and lead to increased emissions and potential engine performance problems.

What are the symptoms of the P2420 code?

Drivers may experience several symptoms, such as:

• Illumination of the Check Engine Light.
• Increased emissions or fuel consumption.
• Foul odor of fuel vapors.
• Difficulty in passing emissions tests.
• Possible rough idle or engine performance problems if the system is not functioning properly.

What causes the P2420 code?

Common causes of the P2420 code include:

• Faulty evaporative emission system switching valve.
• Short circuit in the wiring or connectors.
• Open circuit or poor connections in the control circuit.
• Failed engine control module (ECM).
• Issues related to the fuel tank or fuel cap, such as leaks or improper sealing.

How to fix P2420?

To resolve the P2420 fault code, follow these steps:

1. Inspect the evaporative emission system switching valve for damage or faults.
2. Check the wiring and connectors for any signs of wear, corrosion, or shorts.
3. Test the valve operation using a multimeter or scan tool to ensure it opens and closes properly.
4. If necessary, replace the faulty valve or repair damaged wiring.
5. Clear the fault codes and conduct a test drive to ensure the issue is resolved and the Check Engine Light does not reappear.