AutoCodes – Buick – P24A0 Buick

P24A0 Buick Code - Closed Loop Diesel Particulate Filter Regeneration Control At Limit Low Temperature

Quick Answer

The diesel exhaust aftertreatment system consists of an underhood pre-catalytic converter and an underbody catalyst converter. Common causes include Perform the Diesel Particulate Filter Service Regeneration, Faulty Exhaust Gas Temperature Sensor, Exhaust Gas Temperature Sensor harness is open or shorted. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P24A0 Buick indicates Closed Loop Diesel Particulate Filter Regeneration Control At Limit Low Temperature.
Common causes: Common causes include Perform the Diesel Particulate Filter Service Regeneration, Faulty Exhaust Gas Temperature Sensor, Exhaust Gas Temperature Sensor harness is open or shorted.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 320

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 29, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P24A0 Buick Description

The diesel exhaust aftertreatment system consists of an underhood pre-catalytic converter and an underbody catalyst converter. The underbody catalyst converter also consists of the main Diesel Oxidation Catalyst and the coated Diesel Particulate Filter (DPF). One of the main purposes of the DPF is to collect particulates from the engine exhaust in order to minimize discharge of soot to the atmosphere. The soot particles accumulate in the channels of the DPF and are burned off at regular intervals through a process called regeneration. This prevents the DPF from clogging. The Engine Control Module (ECM) commands the DPF regeneration after calculating various vehicle conditions such as DPF pressure difference, exhaust gas temperature, engine oil quality, engine speed, etc. Excessive accumulation of the soot in the DPF can cause a drop in the engine performance. During regeneration, additional fuel is injected via multiple post injections in order to increase the exhaust gas temperature. During this period, the DPF temperature is raised to approximately 600°C (1112°F) and the accumulated soot is oxidized or burned off into carbon dioxide (CO2). The Diagnostic Trouble Code (DTC) will be set when the ECM detects insufficient exhaust temperature upstream of the DPF during a DPF regeneration.

OBDII Code P24A0 Buick - Closed Loop Diesel Particulate Filter Regeneration Control At Limit Low Temperature - AutoCodes.com — P24A0 Buick Code - Closed Loop Diesel Particulate Filter Regeneration Control At Limit Low Temperature

What does this mean?

What are the Possible Causes of the DTC P24A0 Buick?

Perform the Diesel Particulate Filter Service Regeneration
Faulty Exhaust Gas Temperature Sensor
Exhaust Gas Temperature Sensor harness is open or shorted
Exhaust Gas Temperature Sensor circuit poor electrical connection
Faulty Exhaust Particulate Filter

How to Fix the DTC P24A0 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 P24A0 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.

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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 P24A0 Buick Code

1. What are the common symptoms of OBDII code P24A0 on a Buick related to Closed Loop Diesel Particulate Filter Regeneration Control At Limit Low Temperature?

- Common symptoms may include poor engine performance, decreased fuel efficiency, and the illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P24A0 on a Buick?

- The code P24A0 can be triggered by issues such as a faulty diesel particulate filter, malfunctioning temperature sensors, or problems with the regeneration control system.

3. How can I diagnose the cause of OBDII code P24A0 on my Buick?

- Diagnosing the code may involve using a scan tool to read the specific fault codes, checking the diesel particulate filter for clogs or damage, and testing the temperature sensors for proper operation.

4. Can I continue driving my Buick with OBDII code P24A0 present?

- It is not recommended to continue driving with the code present, as it can lead to further damage to the diesel particulate filter and potentially affect the performance of the vehicle.

5. How can I repair OBDII code P24A0 on my Buick?

- Repairing the code may involve cleaning or replacing the diesel particulate filter, repairing or replacing faulty temperature sensors, and resetting the regeneration control system.

6. Are there any DIY tips for resolving OBDII code P24A0 on a Buick?

- DIY tips may include checking for any loose connections, ensuring proper maintenance of the diesel particulate filter, and following the manufacturer's guidelines for regeneration procedures.

7. Is it possible to prevent OBDII code P24A0 from occurring on my Buick?

- Regular maintenance, using high-quality diesel fuel, and avoiding driving in conditions that may hinder the regeneration process can help prevent the occurrence of code P24A0.

8. How critical is it to address OBDII code P24A0 promptly on a Buick?

- It is important to address the code promptly to prevent further damage to the diesel particulate filter and ensure optimal engine performance and fuel efficiency.

9. Can weather conditions affect the triggering of OBDII code P24A0 on a Buick?

- Yes, extreme low temperatures can impact the regeneration process of the diesel particulate filter, potentially leading to the triggering of code P24A0.

10. Is it necessary to visit a dealership or mechanic to address OBDII code P24A0 on a Buick?

- While it is recommended to seek professional assistance for accurate diagnosis and repair, some basic troubleshooting steps can be attempted by DIY enthusiasts before consulting a mechanic.