AutoCodes – GMC – P144F GMC

P144F 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: P144F 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 287

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 P144F 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 P144F GMC - Closed Loop Diesel Particulate Filter Regeneration Control At Limit Stage 2 Low Temperature - AutoCodes.com — P144F 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 P144F 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 P144F 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 P144F 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.

Need more information about the P144F GMC code?

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

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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 P144F GMC Code

1. What are the common symptoms of OBDII code P144F in a GMC vehicle?

- Common symptoms include poor engine performance, reduced fuel efficiency, and the illumination of the check engine light.

2. What causes the OBDII code P144F in a GMC vehicle?

- This code is often triggered by issues related to the closed-loop diesel particulate filter regeneration control system, specifically at low temperatures.

3. How does low temperature affect the Closed Loop Diesel Particulate Filter Regeneration Control At Limit Stage 2 in a GMC vehicle?

- Low temperatures can impede the proper functioning of the diesel particulate filter regeneration system, leading to the activation of code P144F.

4. Can driving habits impact the occurrence of code P144F in a GMC vehicle?

- Yes, frequent short trips or low-speed driving can contribute to the accumulation of soot in the diesel particulate filter, potentially triggering code P144F.

5. What are some DIY repair tips for addressing OBDII code P144F in a GMC vehicle?

- Performing a thorough inspection of the diesel particulate filter system, checking for any clogs or malfunctions, and ensuring proper regeneration cycles can help resolve the issue.

6. Is it safe to continue driving a GMC vehicle with OBDII code P144F illuminated?

- While the vehicle may still be operable, it is recommended to address the underlying issue promptly to prevent further damage to the engine and emissions system.

7. Can a faulty sensor contribute to the triggering of code P144F in a GMC vehicle?

- Yes, a malfunctioning sensor related to the diesel particulate filter regeneration system can lead to the activation of code P144F.

8. How can a mechanic diagnose the specific cause of OBDII code P144F in a GMC vehicle?

- A mechanic can use a diagnostic scanner to retrieve the freeze frame data associated with the code, inspect the diesel particulate filter system components, and perform system tests to pinpoint the exact issue.

9. What is the typical repair cost for addressing OBDII code P144F in a GMC vehicle?

- The repair cost can vary depending on the underlying cause, but it may range from $200 to $800, including parts and labor.

10. Are there any preventative maintenance measures that can help avoid OBDII code P144F in a GMC vehicle?

- Regularly servicing the diesel particulate filter system, avoiding prolonged low-speed driving, and using high-quality fuel can help prevent the recurrence of code P144F.