AutoCodes – Generic – P24A1

P24A1 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 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 4,689

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

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?

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 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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Information for Specific Makes

P24A1 Buick — Closed Loop Diesel Particulate Filter Regeneration Control At Limit High Temperature
P24A1 Cadillac — Closed Loop Diesel Particulate Filter Regeneration Control At Limit High Temperature
P24A1 Chevrolet — Closed Loop Diesel Particulate Filter Regeneration Control At Limit High Temperature
P24A1 Ford — Closed Loop Diesel Particulate Filter Regeneration Control At Limit High Temperature
P24A1 GMC — Closed Loop Diesel Particulate Filter Regeneration Control At Limit High Temperature

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 Code

1. What are the common symptoms of OBDII code P24A1?

- Common symptoms include the illumination of the Check Engine Light (CEL), reduced engine performance, and increased fuel consumption.

2. What does the OBDII code P24A1 indicate?

- OBDII code P24A1 indicates that the Closed Loop Diesel Particulate Filter Regeneration Control is at a limit due to high temperature.

3. What are the possible causes of OBDII code P24A1?

- Possible causes include a faulty diesel particulate filter, issues with the regeneration control system, exhaust system leaks, or sensor malfunctions.

4. How serious is OBDII code P24A1?

- OBDII code P24A1 should be addressed promptly to prevent further damage to the diesel particulate filter and ensure optimal engine performance.

5. Can I continue driving with OBDII code P24A1 present?

- It is not recommended to continue driving with OBDII code P24A1 present, as it can lead to increased emissions, reduced fuel efficiency, and potential engine damage.

6. How can OBDII code P24A1 be diagnosed?

- Diagnosing OBDII code P24A1 usually involves using a scan tool to retrieve the code, inspecting the diesel particulate filter system, and testing relevant sensors.

7. What are some repair tips for fixing OBDII code P24A1?

- Repair tips may include checking and cleaning the diesel particulate filter, replacing damaged sensors, repairing exhaust leaks, and resetting the code after repairs are completed.

8. How much does it typically cost to repair OBDII code P24A1?

- The cost of repairing OBDII code P24A1 can vary depending on the specific cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

9. Can OBDII code P24A1 be prevented?

- Regular maintenance of the diesel particulate filter system, following recommended service intervals, and using quality diesel fuel can help prevent issues that trigger OBDII code P24A1.

10. Is it possible to clear OBDII code P24A1 without fixing the underlying issue?

- While it is possible to clear the code temporarily, the underlying issue causing OBDII code P24A1 will persist and may lead to more severe problems if left unresolved.