AutoCodes – GMC – P24A1 GMC

P24A1 GMC 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 GMC 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 449

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

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 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 P24A1 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 P24A1 GMC Code

1. What does the OBDII code P24A1 GMC mean?

The code P24A1 GMC indicates a Closed Loop Diesel Particulate Filter Regeneration Control At Limit High Temperature issue.

2. What are the common symptoms of a P24A1 GMC code?

Common symptoms of a P24A1 GMC code may include reduced engine performance, decreased fuel efficiency, and the illumination of the check engine light.

3. What are the possible causes of a P24A1 GMC code?

Possible causes of a P24A1 GMC code include a faulty diesel particulate filter, issues with the regeneration system, exhaust leaks, or sensor malfunctions.

4. How can I diagnose a P24A1 GMC code?

Diagnosing a P24A1 GMC code typically involves using an OBDII scanner to retrieve the specific fault code, checking the diesel particulate filter for any signs of damage, and inspecting the regeneration system components for proper function.

5. Can I continue driving with a P24A1 GMC code?

It is not recommended to continue driving with a P24A1 GMC code as it can lead to further damage to the engine and emission system. It is best to address the issue promptly.

6. How can I repair a P24A1 GMC code?

Repairing a P24A1 GMC code may involve cleaning or replacing the diesel particulate filter, repairing any exhaust leaks, resetting the regeneration system, or replacing faulty sensors.

7. Are there any DIY tips for fixing a P24A1 GMC code?

DIY tips for addressing a P24A1 GMC code may include checking for loose connections, ensuring proper fuel quality, and following the manufacturer's guidelines for regeneration system maintenance.

8. How much does it cost to repair a P24A1 GMC code?

The cost of repairing a P24A1 GMC code can vary depending on the extent of the issue, the parts needed for replacement, and whether you choose to do the repair yourself or take it to a mechanic.

9. Can a P24A1 GMC code be prevented?

Regular maintenance of the diesel particulate filter and regeneration system, using high-quality fuel, and driving the vehicle at highway speeds regularly can help prevent a P24A1 GMC code from occurring.

10. Is it safe to clear a P24A1 GMC code with an OBDII scanner?

While clearing a P24A1 GMC code with an OBDII scanner may temporarily turn off the check engine light, it is important to address the underlying issue causing the code to prevent further damage to the vehicle.