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AutoCodes – Toyota – P2420 Toyota

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

Quick Answer

5 hours after the ignition switch is turned off, the leak detection pump creates negative pressure (vacuum) in the Evaporative Emission (EVAP) system. Common causes include Faulty Canister Pump Module, Canister Pump Module harness is open or shorted, Canister Pump Module circuit poor electrical connection. 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 Toyota indicates Evaporative Emission System Switching Valve Control Circuit High.
Common causes
Common causes include Faulty Canister Pump Module, Canister Pump Module harness is open or shorted, Canister Pump Module circuit poor electrical connection.
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.
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Code Popularity 44,950
How popular is this code, among other codes? Medium
What is this?
Table of contents Created and updated by William Orellana on Mar 26, 2024
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Code P2420 Toyota Description

5 hours after the ignition switch is turned off, the leak detection pump creates negative pressure (vacuum) in the Evaporative Emission (EVAP) system. The Engine Control Module (ECM) monitors for leaks and actuator malfunctions based on the EVAP pressure. The ECM illuminates the MIL and sets a Diagnostic Trouble Code (DTC) if the difference in EVAP pressure in EVAP system pressure is small and does not increase more than 2.25 mmHg (0.3 kPa) within 10 seconds of changing the vent valve from OFF (vent) to ON (closed), the ECM determines that the vent valve is stuck OFF (vent).
OBDII Code P2420 Toyota - Evaporative Emission System Switching Valve Control Circuit High - AutoCodes.com
P2420 Toyota Code - Evaporative Emission System Switching Valve Control Circuit High
What does this mean?

What are the Possible Causes of the DTC P2420 Toyota?

  • Faulty Canister Pump Module
  • Canister Pump Module harness is open or shorted
  • Canister Pump Module circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How to Fix the DTC P2420 Toyota?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2420 Toyota code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2420 Toyota code?

Need more information on how to fix the P2420 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2420 Toyota code diagnosed by a professional: Find a repair shop in your area

Information for Specific Toyota Models

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 Toyota Code

1. What are the common symptoms of OBDII code P2420 in a Toyota?

- Common symptoms include the check engine light illuminating, decreased fuel efficiency, rough idling, and potential issues with vehicle emissions.

2. What can cause the OBDII code P2420 in a Toyota?

- The code P2420 can be triggered by a faulty evaporative emission system switching valve, damaged wiring or connectors, or a malfunctioning engine control module (ECM).

3. How serious is the OBDII code P2420 in a Toyota?

- While the code itself may not cause immediate harm to the vehicle, it can lead to increased emissions, reduced fuel efficiency, and potential issues with passing emissions tests.

4. How can I diagnose the OBDII code P2420 in my Toyota?

- Diagnosing the code typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the evaporative emission system components, and testing the switching valve and related wiring.

5. Can I drive my Toyota with the OBDII code P2420?

- It is generally safe to drive the vehicle with the code P2420, but it is recommended to have the issue diagnosed and repaired as soon as possible to prevent potential long-term damage or emissions problems.

6. What are some repair tips for fixing the OBDII code P2420 in a Toyota?

- Repair tips may include checking and cleaning the switching valve, inspecting and repairing any damaged wiring or connectors, and resetting the ECM after completing the repairs.

7. How much does it typically cost to repair the OBDII code P2420 in a Toyota?

- The cost of repairs for the code P2420 can vary depending on the exact cause of the issue, but it may range from around $100 for a DIY fix to a few hundred dollars if professional assistance is needed.

8. Can a DIY enthusiast fix the OBDII code P2420 in a Toyota?

- Depending on the cause of the code, a knowledgeable DIY enthusiast may be able to fix the issue by replacing the switching valve, checking and repairing wiring, and clearing the code with an OBDII scanner.

9. How long does it take to repair the OBDII code P2420 in a Toyota?

- The repair time can vary based on the complexity of the issue and the skill level of the person performing the repairs, but it may take anywhere from 30 minutes to a few hours to complete the necessary fixes.

10. Will resetting the check engine light resolve the OBDII code P2420 in a Toyota?

- While resetting the check engine light may temporarily clear the code, it will not fix the underlying issue causing the code to appear. It is essential to diagnose and repair the problem to prevent it from reoccurring.

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