AutoCodes – Lexus – P2420 Lexus

P2420 Lexus 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 Lexus 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 7,592

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 26, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2420 Lexus 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 Lexus - Evaporative Emission System Switching Valve Control Circuit High - AutoCodes.com — P2420 Lexus Code - Evaporative Emission System Switching Valve Control Circuit High

What does this mean?

What are the Possible Causes of the DTC P2420 Lexus?

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 Lexus?

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 Lexus 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 Lexus code?

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

Need Help with the Code?

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

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 Lexus Code

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

- Common symptoms include the check engine light coming on, decreased fuel efficiency, and potential issues with the vehicle's emission system.

2. What could cause the OBDII code P2420 in a Lexus to trigger?

- This code is typically triggered by a malfunction in the evaporative emission system switching valve control circuit, which may be caused by a faulty valve, wiring issues, or a defective control module.

3. How can I diagnose the OBDII code P2420 in my Lexus?

- To diagnose this code, you can use an OBDII scanner to retrieve the specific trouble code and then inspect the switching valve, wiring connections, and control module for any visible signs of damage or malfunction.

4. Can I still drive my Lexus with the OBDII code P2420 present?

- While it may be possible to drive the vehicle with this code present, it is recommended to address the issue promptly to prevent potential damage to the emission system and ensure optimal vehicle performance.

5. What are some repair tips for fixing OBDII code P2420 in a Lexus?

- Repair tips may include checking and replacing the switching valve, repairing any damaged wiring or connections, and resetting the trouble code to see if the issue persists.

6. Is it necessary to visit a mechanic for OBDII code P2420 in a Lexus?

- While some DIY enthusiasts may attempt to diagnose and repair this issue themselves, it is advisable to consult a qualified mechanic or automotive technician for a comprehensive diagnosis and proper repair.

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

- The cost of repairing this code can vary depending on the extent of the issue and the specific components that need to be replaced. It's recommended to obtain a quote from a mechanic for an accurate estimate.

8. Can resetting the check engine light resolve OBDII code P2420 temporarily?

- Resetting the check engine light may temporarily turn it off, but if the underlying issue causing the code is not addressed, the light is likely to come back on as the problem persists.

9. Are there any safety concerns associated with OBDII code P2420 in a Lexus?

- While the code itself may not pose immediate safety concerns, unresolved emission system issues can lead to environmental pollution and may impact the overall performance and efficiency of the vehicle.

10. How can I prevent OBDII code P2420 from occurring in my Lexus?

- Regular maintenance, including checking the emission system components and addressing any warning lights promptly, can help prevent the recurrence of this code in your Lexus.