AutoCodes – Buick – P144E Buick

P144E Buick Code - Closed Loop Diesel Particulate Filter Regeneration Control At Limit Stage 2 Low Temperature

Quick Answer

The main function of the Close-Coupled Diesel Oxidation Catalyst (CCDOC) is to control emissions of non-methane hydrocarbons and Carbon Monoxide (CO). Common causes include Faulty Exhaust Gas Temperature Sensor, Exhaust Gas Temperature Sensor harness is open or shorted, Exhaust Gas Temperature Sensor 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: P144E Buick indicates Closed Loop Diesel Particulate Filter Regeneration Control At Limit Stage 2 Low Temperature.
Common causes: Common causes include Faulty Exhaust Gas Temperature Sensor, Exhaust Gas Temperature Sensor harness is open or shorted, Exhaust Gas Temperature Sensor 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 357

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 25, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P144E Buick Description

The main function of the Close-Coupled Diesel Oxidation Catalyst (CCDOC) is to control emissions of non-methane hydrocarbons and Carbon Monoxide (CO). Its secondary function is to assist with the Diesel Particulate Filter (DPF) regeneration, by obtaining and sustaining the temperature necessary for regeneration. In order to generate the high exhaust temperatures needed for regeneration, the aftertreatment system increases exhaust temperatures by injecting diesel fuel into the exhaust system via post-injection. The injected fuel is converted into heat by the Diesel Oxidation Catalyst (DOC) to incinerate soot accumulated in the DPF. The Engine Control Module (ECM) monitors the exhaust gas temperature sensor 1 and 2 to determine if catalyst downstream temperatures are achieved during a DPF regeneration.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects insufficient exhaust temperature downstream of the first diesel oxidation catalyst during a DPF regeneration.

OBDII Code P144E Buick - Closed Loop Diesel Particulate Filter Regeneration Control At Limit Stage 2 Low Temperature - AutoCodes.com — P144E Buick Code - Closed Loop Diesel Particulate Filter Regeneration Control At Limit Stage 2 Low Temperature

What does this mean?

What are the Possible Causes of the DTC P144E Buick?

Faulty Exhaust Gas Temperature Sensor
Exhaust Gas Temperature Sensor harness is open or shorted
Exhaust Gas Temperature Sensor circuit poor electrical connection
Faulty Diesel Oxidation Catalyst (DOC)

How to Fix the DTC P144E Buick?

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 P144E Buick 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 P144E Buick code?

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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 P144E Buick Code

1. What are the common symptoms of OBDII code P144E in a Buick related to Closed Loop Diesel Particulate Filter Regeneration Control At Limit Stage 2 Low Temperature?

- Common symptoms include reduced engine performance, decreased fuel efficiency, and an illuminated check engine light.

2. What can cause the OBDII code P144E in a Buick to trigger?

- The code P144E can be triggered by issues such as a faulty diesel particulate filter (DPF), sensor malfunctions, or a problem with the regeneration control system.

3. How can I diagnose the OBDII code P144E in my Buick?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, inspecting the DPF system for any visible damage or clogs, and testing sensors for proper functionality.

4. What are the potential repair options for resolving OBDII code P144E in a Buick?

- Repair options may include cleaning or replacing the diesel particulate filter, repairing or replacing faulty sensors, addressing issues with the regeneration control system, and performing a forced regeneration procedure.

5. Is it safe to continue driving my Buick with the OBDII code P144E present?

- It is not recommended to drive the vehicle with the code P144E present, as it can lead to further damage to the DPF system and potentially affect the vehicle's performance.

6. How can I prevent the recurrence of OBDII code P144E in my Buick?

- To prevent the recurrence of the code, it is essential to maintain regular maintenance of the DPF system, use high-quality diesel fuel, and follow the manufacturer's recommended service intervals.

7. Can I reset the OBDII code P144E in my Buick using an OBDII scanner?

- Resetting the code with an OBDII scanner may temporarily clear the check engine light, but it will not resolve the underlying issue causing the code to trigger.

8. What are the long-term effects of ignoring the OBDII code P144E in a Buick?

- Ignoring the code can lead to increased emissions, reduced engine efficiency, and potential damage to the DPF system, resulting in costly repairs down the line.

9. Are there any temporary solutions to address the OBDII code P144E in my Buick?

- Performing a forced regeneration procedure, ensuring proper fuel quality, and driving the vehicle at highway speeds can sometimes temporarily alleviate the code until a proper repair can be made.

10. How can a professional mechanic help me resolve the OBDII code P144E in my Buick?

- A professional mechanic can conduct a thorough diagnosis, accurately pinpoint the root cause of the code, perform necessary repairs or replacements, and ensure the DPF system is functioning correctly to clear the code.