AutoCodes – Generic – P144F

P144F Code - EGR Cooler Bypass Status Line Circuit High

Quick Answer

The Exhaust Gas Recirculation (EGR) Cooler Bypass Valve is used to redirect the EGR gases around the cooler when the engine is under certain operating conditions. Common causes include Faulty EGR Cooler Bypass Valve, EGR Cooler Bypass Valve harness is open or shorted, EGR Cooler Bypass 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: P144F indicates EGR Cooler Bypass Status Line Circuit High.
Common causes: Common causes include Faulty EGR Cooler Bypass Valve, EGR Cooler Bypass Valve harness is open or shorted, EGR Cooler Bypass 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 7,454

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 Sep 27, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P144F Description

The Exhaust Gas Recirculation (EGR) Cooler Bypass Valve is used to redirect the EGR gases around the cooler when the engine is under certain operating conditions. The EGR Cooler Bypass Valve is a smart device which communicates it's status to the Powertrain Control Module (PCM). At key on the EGR Cooler Bypass Valve drives the signal line low and then high and the PCM monitors for the correct status response from the EGR Cooler Bypass Valve. Throughout engine operation the PCM sends commands via the signal circuit to the EGR Cooler Bypass Valve and monitors the status line to confirm that the EGR Cooler Bypass Valve has reached the commanded position. When a fault occurs, the EGR Cooler Bypass valve will send a signal of less than one Volt on the status line to the PCM. This monitor is a one trip fault.

OBDII Code P144F - EGR Cooler Bypass Status Line Circuit High - AutoCodes.com — P144F Code - EGR Cooler Bypass Status Line Circuit High

What does this mean?

What are the Possible Causes of the DTC P144F?

Faulty EGR Cooler Bypass Valve
EGR Cooler Bypass Valve harness is open or shorted
EGR Cooler Bypass Valve circuit poor electrical connection

How to Fix the DTC P144F?

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 P144F 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 P144F code?

Need more information on how to fix the P144F code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P144F code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P144F Buick — Closed Loop Diesel Particulate Filter Regeneration Control At Limit Stage 2 Low Temperature
P144F Cadillac — Closed Loop Diesel Particulate Filter Regeneration Control At Limit Stage 2 Low Temperature
P144F Chevrolet — Closed Loop Diesel Particulate Filter Regeneration Control At Limit Stage 2 Low Temperature
P144F Dodge — EGR Cooler Bypass Status Line Circuit High
P144F GMC — Closed Loop Diesel Particulate Filter Regeneration Control At Limit Stage 2 Low Temperature

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 P144F Code

1. What are the common symptoms of OBDII code P144F (EGR Cooler Bypass Status Line Circuit High)?

The common symptoms of code P144F may include poor engine performance, decreased fuel efficiency, and the illumination of the Check Engine Light.

2. What causes OBDII code P144F to trigger?

Code P144F is typically triggered by a malfunction in the EGR cooler bypass status line circuit, often due to a short circuit, open circuit, or faulty electrical connection.

3. How can I diagnose OBDII code P144F?

Diagnosing code P144F involves using a diagnostic scanner to retrieve the trouble code, inspecting the EGR cooler bypass system for any visible damage, and testing the electrical connections for continuity and proper voltage levels.

4. Can I continue driving with OBDII code P144F active?

It is not recommended to continue driving with code P144F active, as it can lead to further damage to the EGR system and potentially affect the overall performance and efficiency of the vehicle.

5. How can I repair OBDII code P144F?

Repairing code P144F often involves repairing or replacing damaged wiring in the EGR cooler bypass system, ensuring proper electrical connections, and clearing the trouble code with a diagnostic scanner.

6. Is it possible to prevent OBDII code P144F from recurring?

Regular maintenance of the EGR system, checking for any signs of wear or damage, and addressing any related issues promptly can help prevent the recurrence of code P144F.

7. Can a DIY enthusiast fix OBDII code P144F?

While some DIY enthusiasts may be able to diagnose and repair code P144F, it is recommended to seek professional help, especially if dealing with electrical components, to ensure proper repair and prevent further damage.

8. How much does it typically cost to repair OBDII code P144F?

The cost of repairing code P144F can vary depending on the extent of the damage, parts needed for replacement, and labor costs. It is advisable to consult a mechanic for a more accurate estimate.

9. Will resetting the Check Engine Light resolve OBDII code P144F?

Resetting the Check Engine Light may temporarily turn off the light, but it will not fix the underlying issue causing code P144F. It is essential to diagnose and repair the problem to prevent the code from reappearing.

10. How long does it take to repair OBDII code P144F?

The repair time for code P144F can vary depending on the complexity of the issue, availability of parts, and the expertise of the mechanic. In some cases, it may be a relatively quick fix, while in others, it could take more time to diagnose and repair.