AutoCodes – GMC – P144E GMC

P144E GMC 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 GMC 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 954

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 GMC 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 GMC - Closed Loop Diesel Particulate Filter Regeneration Control At Limit Stage 2 Low Temperature - AutoCodes.com — P144E GMC 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 GMC?

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 GMC?

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 GMC 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 P144E GMC Code

1. What are common symptoms of OBDII code P144E GMC?

The common symptoms of code P144E GMC include poor engine performance, reduced fuel efficiency, black smoke from the tailpipe, and the illumination of the Check Engine Light.

2. What does the OBDII code P144E GMC indicate?

The code P144E GMC indicates a Closed Loop Diesel Particulate Filter Regeneration Control At Limit Stage 2 Low Temperature fault.

3. What are possible causes of OBDII code P144E GMC?

Possible causes of code P144E GMC include a faulty diesel particulate filter (DPF), a malfunctioning temperature sensor, exhaust leaks, or issues with the regeneration control system.

4. How can I diagnose OBDII code P144E GMC?

Diagnosing code P144E GMC typically involves using a diagnostic scanner to retrieve the code and then performing a visual inspection of the DPF system, checking the temperature sensor, and testing the regeneration control components.

5. Can I continue driving with OBDII code P144E GMC?

It is not recommended to continue driving with code P144E GMC present, as it can lead to further damage to the DPF system and negatively impact engine performance.

6. How can I repair OBDII code P144E GMC?

Repairing code P144E GMC may involve replacing the diesel particulate filter, repairing any exhaust leaks, replacing the temperature sensor, or addressing issues with the regeneration control system.

7. Can I reset the Check Engine Light after fixing OBDII code P144E GMC?

After repairing the issue causing code P144E GMC, you can reset the Check Engine Light using a diagnostic scanner to clear the code and turn off the warning light.

8. How important is it to address OBDII code P144E GMC promptly?

It is crucial to address code P144E GMC promptly to avoid further damage to the DPF system, prevent decreased fuel efficiency, and ensure optimal engine performance.

9. Will OBDII code P144E GMC cause my vehicle to fail an emissions test?

Yes, code P144E GMC can cause your vehicle to fail an emissions test due to the potential impact on the diesel particulate filter and emissions control system.

10. How can I prevent OBDII code P144E GMC from recurring?

To prevent code P144E GMC from recurring, it is essential to maintain regular maintenance of the DPF system, follow proper driving habits to promote regeneration, and address any issues promptly to avoid further complications.