AutoCodes – Buick – P24A1 Buick

P24A1 Buick Code - Closed Loop Diesel Particulate Filter Regeneration Control At Limit High 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 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: P24A1 Buick indicates Closed Loop Diesel Particulate Filter Regeneration Control At Limit High 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: 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 378

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 29, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P24A1 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 greater than desired exhaust temperature upstream of the DPF during a DPF regeneration.

OBDII Code P24A1 Buick - Closed Loop Diesel Particulate Filter Regeneration Control At Limit High Temperature - AutoCodes.com — P24A1 Buick Code - Closed Loop Diesel Particulate Filter Regeneration Control At Limit High Temperature

What does this mean?

What are the Possible Causes of the DTC P24A1 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 P24A1 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 P24A1 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 P24A1 Buick Code

1. What does the OBDII code P24A1 mean on a Buick?

P24A1 indicates that the closed-loop control for diesel particulate filter (DPF) regeneration has reached a high-temperature limit, suggesting an issue with the regeneration process.

2. What are the common symptoms of code P24A1?

Symptoms may include the check engine light turning on, reduced engine performance, increased fuel consumption, or the DPF regeneration process failing to complete properly.

3. What causes the P24A1 code to appear?

Common causes include a malfunctioning temperature sensor, excessive soot buildup in the DPF, a faulty exhaust gas temperature sensor, or issues with the DPF regeneration system.

4. Can I drive my Buick with a P24A1 code?

Driving with this code is not recommended for an extended period, as it may lead to further damage to the DPF or exhaust system and reduced engine efficiency.

5. How is the P24A1 code diagnosed?

A mechanic will use a scan tool to read the code, check the exhaust temperature sensors, inspect the DPF for excessive soot buildup, and verify the performance of the regeneration system.

6. What repairs are needed to fix the P24A1 code?

Repairs may include cleaning or replacing the DPF, replacing a faulty temperature sensor, repairing wiring or connectors, or resetting the DPF regeneration system.

7. How much does it cost to fix a P24A1 code on a Buick?

Repair costs vary depending on the issue. Replacing a temperature sensor may cost $100-$300, while cleaning or replacing the DPF can range from $500 to over $2,000.

8. What happens if I ignore the P24A1 code?

Ignoring the code can lead to DPF failure, reduced fuel efficiency, potential engine damage, and costly repairs down the line.

9. Can a software update fix the P24A1 code?

In some cases, a software update from the manufacturer may address issues with the DPF regeneration system, but a full diagnosis is needed to confirm if this is the solution.

10. How can I prevent the P24A1 code from recurring?

Regular maintenance, using the correct diesel fuel, driving at highway speeds periodically to allow proper DPF regeneration, and addressing warning lights promptly can help prevent this code.