AutoCodes – Volvo – P2420 Volvo

P2420 Volvo Code - Leak Diagnostic Unit Valve Signal Too High

Quick Answer

The Diagnostic Trouble Code (DTC) is stored i the Engine Control Module (ECM) registers that the signal from the valve in the pump for the leak diagnostic is too high when the valve is activated. Common causes include Faulty Leak Diagnostic Unit Valve, Leak Diagnostic Unit Valve harness is open or shorted, Leak Diagnostic Unit Valve 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 Volvo indicates Leak Diagnostic Unit Valve Signal Too High.
Common causes: Common causes include Faulty Leak Diagnostic Unit Valve, Leak Diagnostic Unit Valve harness is open or shorted, Leak Diagnostic Unit Valve 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 5,951

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2420 Volvo Description

The Diagnostic Trouble Code (DTC) is stored i the Engine Control Module (ECM) registers that the signal from the valve in the pump for the leak diagnostic is too high when the valve is activated.

OBDII Code P2420 Volvo - Leak Diagnostic Unit Valve Signal Too High - AutoCodes.com — P2420 Volvo Code - Leak Diagnostic Unit Valve Signal Too High

What does this mean?

What are the Possible Causes of the DTC P2420 Volvo?

Faulty Leak Diagnostic Unit Valve
Leak Diagnostic Unit Valve harness is open or shorted
Leak Diagnostic Unit Valve circuit poor electrical connection

How to Fix the DTC P2420 Volvo?

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 Volvo 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 Volvo code?

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

Need Help with the Code?

Get the P2420 Volvo 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 Volvo Code

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

Symptoms may include a check engine light illuminated on the dashboard, decreased fuel efficiency, and potential issues with the vehicle's emission control system.

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

This code is typically triggered when the Leak Diagnostic Unit (LDU) valve signal is detected to be too high, indicating a potential malfunction in the LDU system or related components.

3. How serious is OBDII code P2420 in a Volvo?

While the vehicle may still be operable with this code present, it is important to address it promptly to prevent any potential long-term damage to the emission control system and maintain optimal engine performance.

4. Can I continue driving my Volvo with OBDII code P2420?

It is generally not recommended to drive the vehicle for an extended period with this code active, as unresolved issues related to the emission control system may lead to more severe problems over time.

5. What are some DIY repair tips for OBDII code P2420 in a Volvo?

DIY enthusiasts can start by checking the LDU valve and its wiring for any visible damage or loose connections. Clearing the code and monitoring for its recurrence after these checks can also be helpful.

6. How much does it typically cost to repair OBDII code P2420 in a Volvo?

The cost of repair can vary depending on the specific cause of the issue. Simple fixes like replacing a faulty LDU valve or repairing damaged wiring may be relatively affordable, but more complex problems could require professional diagnostics and repairs.

7. Can a faulty gas cap trigger OBDII code P2420 in a Volvo?

While a faulty gas cap is more commonly associated with codes related to evaporative emissions, it is still a good idea to check the gas cap as a potential cause for triggering code P2420.

8. What role does the Leak Diagnostic Unit play in the emission control system of a Volvo?

The Leak Diagnostic Unit is responsible for monitoring the evaporative emissions system of the vehicle, ensuring that no fuel vapors escape into the atmosphere and maintaining optimal emissions performance.

9. How can I prevent OBDII code P2420 from recurring in my Volvo?

Regularly inspecting and maintaining the components of the evaporative emissions system, such as the LDU valve and associated wiring, can help prevent issues that lead to code P2420 from occurring in the future.

10. Is it necessary to reset the OBDII system after repairing OBDII code P2420 in a Volvo?

After addressing the underlying cause of the code and making the necessary repairs, it is recommended to clear the code from the OBDII system to ensure that the issue has been resolved and to monitor for any potential reoccurrence.