AutoCodes – Generic – P226D

P226D Code - Diesel Particulate Filter Deteriorated

Quick Answer

The diesel exhaust aftertreatment system consists of an under hood pre-catalyst and an underbody catalyst. Common causes include Faulty Diesel Particulate Filter. 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: P226D indicates Diesel Particulate Filter Deteriorated.
Common causes: Common causes include Faulty Diesel Particulate Filter.
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 18,734

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 27, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P226D Description

The diesel exhaust aftertreatment system consists of an under hood pre-catalyst and an underbody catalyst. The underbody catalyst 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 the 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 that the pressure difference over the DPF is less than the set threshold.

OBDII Code P226D - Diesel Particulate Filter Deteriorated - AutoCodes.com — P226D Code - Diesel Particulate Filter Deteriorated

What does this mean?

What are the Possible Causes of the DTC P226D?

Faulty Diesel Particulate Filter

How to Fix the DTC P226D?

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 P226D 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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Need more information on how to fix the P226D code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P226D code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P226D Buick — Diesel Particulate Filter Deteriorated
P226D Cadillac — Diesel Particulate Filter Deteriorated
P226D Chevrolet — Diesel Particulate Filter Deteriorated
P226D GMC — Diesel Particulate Filter Deteriorated

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 P226D Code

1. What are the common symptoms of OBDII code P226D (Diesel Particulate Filter Deteriorated)?

The common symptoms include reduced engine performance, decreased fuel efficiency, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P226D?

The code P226D is typically caused by a deteriorated diesel particulate filter (DPF) due to excessive soot accumulation or other issues with the DPF system.

3. How serious is the OBDII code P226D?

Ignoring the code P226D can lead to further damage to the engine and emissions system, potentially resulting in costly repairs. It is important to address this issue promptly.

4. Can I continue driving with the OBDII code P226D?

It's not recommended to continue driving with the code P226D as it can lead to engine damage and increased emissions. It's best to have the issue diagnosed and repaired as soon as possible.

5. How can I diagnose the OBDII code P226D?

Diagnosing the code P226D usually requires a professional OBDII scanner to retrieve the fault codes and conduct further testing on the diesel particulate filter and related components.

6. What are some repair tips for OBDII code P226D?

Repairing the code P226D may involve cleaning or replacing the diesel particulate filter, addressing any underlying issues causing the filter deterioration, and resetting the code with a diagnostic tool.

7. How can I prevent OBDII code P226D from recurring?

Regular maintenance of the diesel particulate filter, using high-quality diesel fuel, and driving at appropriate speeds to allow for proper regeneration of the DPF can help prevent the recurrence of the code P226D.

8. Can I reset the OBDII code P226D without fixing the underlying issue?

Resetting the code without addressing the underlying issue will only temporarily turn off the check engine light. It's crucial to fix the root cause to prevent further problems.

9. Is it possible to clean a deteriorated diesel particulate filter?

In some cases, a professional cleaning service can be used to clean a clogged or deteriorated diesel particulate filter. However, severe deterioration may require replacement.

10. How much does it typically cost to repair OBDII code P226D?

The cost of repairing the code P226D can vary depending on the extent of the damage, parts needed for replacement or repair, and labor costs. It's advisable to consult with a mechanic for an accurate estimate.