AutoCodes – Mercury – P144C Mercury

P144C Mercury Code - Evaporative Emission System Purge Check Valve Performance

Quick Answer

The Powertrain Control Module (PCM) tests the Evaporative Emission (EVAP) canister purge check valve for a stuck open condition. Common causes include Stuck open Evaporative Emission (EVAP) canister purge check valve (part of EVAP canister purge valve), Damaged EVAP canister purge check valve. 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: P144C Mercury indicates Evaporative Emission System Purge Check Valve Performance.
Common causes: Common causes include Stuck open Evaporative Emission (EVAP) canister purge check valve (part of EVAP canister purge valve), Damaged EVAP canister purge check valve.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,861

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 Jul 26, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P144C Mercury Description

The Powertrain Control Module (PCM) tests the Evaporative Emission (EVAP) canister purge check valve for a stuck open condition. The EVAP canister purge check valve test is performed during minimal boost conditions, once per drive cycle, when entry conditions are met. The DTC is set if the fuel tank pressure exceeds a calibrated amount within a specified amount of time during the test.

OBDII Code P144C Mercury - Evaporative Emission System Purge Check Valve Performance - AutoCodes.com — P144C Mercury Code - Evaporative Emission System Purge Check Valve Performance

What does this mean?

What are the Possible Causes of the DTC P144C Mercury?

Stuck open Evaporative Emission (EVAP) canister purge check valve (part of EVAP canister purge valve)
Damaged EVAP canister purge check valve

How to Fix the DTC P144C Mercury?

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 P144C Mercury 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 P144C Mercury code?

Need more information on how to fix the P144C Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P144C Mercury 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 P144C Mercury Code

1. What does the OBDII code P144C mean on a Mercury vehicle?

P144C indicates an issue with the Evaporative Emission System Purge Check Valve Performance, which may not be functioning properly to regulate fuel vapor flow.

2. What are the common symptoms of code P144C in a Mercury?

Symptoms include an illuminated check engine light, difficulty starting the engine, rough idling, decreased fuel efficiency, and potential fuel odor near the vehicle.

3. What causes the P144C code to appear?

Common causes include a faulty purge check valve, clogged or damaged vacuum lines, a malfunctioning EVAP canister, or issues with the PCM (Powertrain Control Module).

4. Can I drive my Mercury with a P144C code?

While the vehicle may still be drivable, ignoring the code can lead to poor performance, increased emissions, and potential damage to other components over time.

5. How do you diagnose a P144C code?

Diagnosing involves using an OBDII scanner to confirm the code, inspecting the purge check valve and EVAP system for damage or blockages, and testing the system for proper functionality.

6. What repairs can fix the P144C code?

Repairs may include replacing the purge check valve, repairing damaged vacuum lines, cleaning or replacing the EVAP canister, or reprogramming the PCM if necessary.

7. How much does it cost to fix a P144C code on a Mercury?

The repair cost varies depending on the issue but typically ranges from $100 to $300, including parts and labor.

8. Can a loose gas cap trigger the P144C code?

A loose gas cap is unlikely to cause P144C directly but can cause other EVAP-related codes. Always ensure the gas cap is tight before diagnosing further.

9. Does the P144C code affect emissions testing?

Yes, the P144C code may cause your vehicle to fail emissions testing due to improper EVAP system operation.

10. How can I prevent the P144C code from recurring?

Regular maintenance of the EVAP system, inspecting for leaks or damage, and ensuring the purge valve operates correctly can help prevent the code from returning.