AutoCodes – Generic – P2451

P2451 Code - Evaporative Emission System Switching Valve Stuck Closed

Quick Answer

The Engine Control Module monitors the Evaporative Emission System Switching Valve. Common causes include Faulty Evaporative Emission System Switching Valve, Evaporative Emission System Switching Valve harness is open or shorted, Evaporative Emission System Switching 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: P2451 indicates Evaporative Emission System Switching Valve Stuck Closed.
Common causes: Common causes include Faulty Evaporative Emission System Switching Valve, Evaporative Emission System Switching Valve harness is open or shorted, Evaporative Emission System Switching 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 11,961

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 Jan 14, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P2451 Description

The Engine Control Module monitors the Evaporative Emission System Switching Valve. The OBDII code is set when the Evaporative Emission System Switching Valve is out factory specifications.

OBDII Code P2451 - Evaporative Emission System Switching Valve Stuck Closed - AutoCodes.com — P2451 Code - Evaporative Emission System Switching Valve Stuck Closed

What does this mean?

What are the Possible Causes of the DTC P2451?

Faulty Evaporative Emission System Switching Valve
Evaporative Emission System Switching Valve harness is open or shorted
Evaporative Emission System Switching Valve circuit poor electrical connection

How to Fix the DTC P2451?

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 P2451 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 P2451 code?

Need more information on how to fix the P2451 code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

P2451 Ford — Evaporative Emission System Switching Valve Stuck Closed

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.