AutoCodes – Acura – P0451 Acura

P0451 Acura Code - Evaporative Emission Leak Check Module Pressure Sensor Range/Performancee

Quick Answer

The Powertrain Control Module (PCM) monitors the leak detection pressure sensor output voltage. Common causes include Faulty Evaporative Emission (EVAP) Leak Detection Pressure Sensor (Part of Leak Check Module), EVAP Leak Detection Pressure Sensor harness is open or shorted, EVAP Leak Detection Pressure Sensor circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: P0451 Acura indicates Evaporative Emission Leak Check Module Pressure Sensor Range/Performancee.
Common causes: Common causes include Faulty Evaporative Emission (EVAP) Leak Detection Pressure Sensor (Part of Leak Check Module), EVAP Leak Detection Pressure Sensor harness is open or shorted, EVAP Leak Detection Pressure Sensor circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 6,136

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Dec 19, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0451 Acura Description

The Powertrain Control Module (PCM) monitors the leak detection pressure sensor output voltage. The leak detection pressure sensor output voltage rises as the fuel tank pressure increases. Conversely, the leak detection pressure sensor output voltage drops as the fuel tank pressure decreases. Rapid changes in the leak detection pressure sensor output voltage due to electrical noise or an intermittent open during the EVAP leak detection may cause incorrect leak detection, so abnormal output is monitored. If the leak detection pressure sensor output voltage change occurs for a specified ratio within a set time, the PCM detects a malfunction and stores a Diagnostic Trouble Code (DTC).

OBDII Code P0451 Acura - Evaporative Emission Leak Check Module Pressure Sensor Range/Performancee - AutoCodes.com — P0451 Acura Code - Evaporative Emission Leak Check Module Pressure Sensor Range/Performancee

What does this mean?

What are the Possible Causes of the DTC P0451 Acura?

Faulty Evaporative Emission (EVAP) Leak Detection Pressure Sensor (Part of Leak Check Module)
EVAP Leak Detection Pressure Sensor harness is open or shorted
EVAP Leak Detection Pressure Sensor circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P0451 Acura?

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 P0451 Acura 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.

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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 P0451 Acura Code

1. What does OBDII code P0451 for an Acura indicate?

The code P0451 in an Acura refers to a problem with the Evaporative Emission Leak Check Module Pressure Sensor Range/Performance.

2. What are the common symptoms of a P0451 code in an Acura?

Common symptoms include the check engine light being illuminated, decreased fuel efficiency, and potential issues with the vehicle's emissions system.

3. What are some possible causes of the P0451 code in an Acura?

Potential causes include a faulty Evaporative Emission Leak Check Module Pressure Sensor, a damaged wiring harness, or a loose gas cap.

4. How serious is the P0451 code in an Acura?

While this code may not cause immediate drivability issues, it is important to address it promptly to ensure proper emissions control and prevent potential damage to the vehicle's components.

5. Can I continue driving my Acura with a P0451 code?

It is generally safe to drive the vehicle for a short period if there are no noticeable performance issues. However, it is recommended to have the issue diagnosed and repaired as soon as possible.

6. How can I diagnose a P0451 code in my Acura?

Diagnosis typically involves using an OBDII scanner to read the code, inspecting the Evaporative Emission Leak Check Module Pressure Sensor and related components, and checking for any visible signs of damage.

7. What is the typical repair process for a P0451 code in an Acura?

Repair may involve replacing the faulty Evaporative Emission Leak Check Module Pressure Sensor, repairing or replacing damaged wiring, or ensuring the gas cap is properly sealed.

8. Can a DIY enthusiast fix a P0451 code in an Acura?

While some aspects of diagnosing and repairing this code may be feasible for DIY enthusiasts, it is recommended to consult a professional mechanic for an accurate diagnosis and proper repair.

9. Will resetting the check engine light resolve the P0451 code in my Acura?

Simply resetting the check engine light may temporarily clear the code, but it will not fix the underlying issue causing the P0451 code. It is crucial to address the root cause of the problem.

10. How can I prevent the P0451 code from appearing in my Acura in the future?

Regularly checking and maintaining the vehicle's emissions system, ensuring the gas cap is securely tightened after refueling, and addressing any warning lights promptly can help prevent the recurrence of the P0451 code.