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P2420 Dodge Code - Evaporative Emission System Switching Valve Control Circuit High

Quick Answer

The P2420 code for Dodge vehicles indicates a problem with the Evaporative Emission System Switching Valve Control Circuit being too high. Common causes include Malfunctioning Switching Valve: The valve itself may be faulty, leading to improper vapor flow, Wiring Issues: Corrosion, damage, or poor connections in the wiring harness can disrupt the control circuit, Faulty Control Module: The ECM (Engine Control Module) responsible for controlling the switching valve may be malfunctioning. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P2420 Dodge indicates Evaporative Emission System Switching Valve Control Circuit High.
Common causes
Common causes include Malfunctioning Switching Valve: The valve itself may be faulty, leading to improper vapor flow, Wiring Issues: Corrosion, damage, or poor connections in the wiring harness can disrupt the control circuit, Faulty Control Module: The ECM (Engine Control Module) responsible for controlling the switching valve may be malfunctioning.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P2420 Dodge Description

The P2420 code for Dodge vehicles indicates a problem with the Evaporative Emission System Switching Valve Control Circuit being too high. This system is responsible for managing the fuel vapors produced in the fuel tank, ensuring they are properly stored and released when needed. The switching valve controls the flow of vapors to the charcoal canister for storage or to the engine for combustion. When the control circuit is reading higher than normal levels, it suggests an issue with the valve's operation, potentially leading to fuel vapor leaks or improper emissions control.

OBDII Code P2420 Dodge - Evaporative Emission System Switching Valve Control Circuit High
P2420 Dodge Code - Evaporative Emission System Switching Valve Control Circuit High

Common Causes of P2420 Dodge

  1. Malfunctioning Switching Valve: The valve itself may be faulty, leading to improper vapor flow.
  2. Wiring Issues: Corrosion, damage, or poor connections in the wiring harness can disrupt the control circuit.
  3. Faulty Control Module: The ECM (Engine Control Module) responsible for controlling the switching valve may be malfunctioning.
  4. Vacuum Leak: A leak in the evaporative emission system can cause improper pressure levels, triggering the code.

Symptoms of P2420 Dodge

  1. Check Engine Light: The most obvious symptom of this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Decreased Fuel Efficiency: A malfunctioning evaporative emission system can lead to increased fuel consumption as the engine may not be operating efficiently.
  3. Rough Idle: The engine may experience rough idling or hesitation during acceleration due to improper vapor flow.
  4. Strong Fuel Odor: A strong smell of fuel near the vehicle, especially when parked, can indicate a fuel vapor leak.
  5. Failed Emissions Test: If the vehicle is due for an emissions test, this code may cause it to fail due to increased emissions.

How to Fix P2420 Dodge

  1. Diagnose the Issue: Use a scan tool to read the OBD-II code and perform further diagnostics to identify the root cause of the problem.
  2. Inspect Wiring and Connections: Check the wiring harness and connectors for any damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test the Switching Valve: Test the switching valve for proper operation and replace if found to be faulty.
  4. Check Control Module: Inspect the ECM for any signs of malfunction and replace if necessary.
  5. Clear Codes and Test Drive: Once the repairs are completed, clear the error codes, and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P2420 Dodge

The cost of repairing a P2420 code for a Dodge vehicle can vary depending on the specific cause of the issue and the labor rates in your area. On average, the repair costs for this type of problem can range from $200 to $500, including parts and labor. Keep in mind that additional diagnostic time may be required to pinpoint the exact issue, and labor rates at auto repair shops can vary widely. It's recommended to consult with a trusted mechanic or dealership for a more accurate cost estimate based on your vehicle's make and model.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2420 Dodge Code

1. What does the OBDII code P2420 mean for a Dodge vehicle?

P2420 indicates an issue with the Evaporative Emission System (EVAP) Switching Valve Control Circuit, specifically a high voltage condition.

2. What are common symptoms of the P2420 code on a Dodge?

Common symptoms include the Check Engine Light turning on, potential fuel odor near the vehicle, and possible difficulty passing emissions tests.

3. What causes the P2420 code to appear?

Possible causes include a faulty EVAP switching valve, damaged wiring or connectors in the control circuit, or a malfunctioning powertrain control module (PCM).

4. Can I drive my Dodge with the P2420 code active?

While the vehicle may still be drivable, addressing the issue promptly is recommended to prevent potential emissions system damage and ensure compliance with regulations.

5. How do I diagnose the P2420 code on a Dodge?

Diagnosis typically involves checking the EVAP switching valve for proper operation, inspecting related wiring and connectors for damage, and testing the control circuit voltage.

6. How can I fix the P2420 code on a Dodge?

Repairs may include replacing the EVAP switching valve, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary.

7. How much does it cost to fix the P2420 code on a Dodge?

Repairs can cost between $100 and $500, depending on whether you need to replace the EVAP switching valve, repair wiring, or replace the PCM.

8. Can a loose gas cap cause the P2420 code?

A loose gas cap is unlikely to cause this specific code, but it can trigger other EVAP-related codes. Always check the gas cap as part of routine diagnostics.

9. Can a bad PCM trigger the P2420 code on a Dodge?

Yes, a malfunctioning PCM can cause this code, but it is less common. Diagnosing other components first is recommended.

10. Does the P2420 code affect fuel efficiency on a Dodge?

Typically, this code does not directly affect fuel efficiency, but unresolved EVAP system issues can lead to fuel vapor loss over time.

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