AutoCodes – Buick – P2002 Buick

P2002 Buick Code - Diesel Particulate Filter Low Efficiency

Quick Answer

The diesel exhaust aftertreatment system consists of an underhood pre-catalyst and an underbody catalyst. Common causes include Replace Diesel Particulate Filter (DPF). 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: P2002 Buick indicates Diesel Particulate Filter Low Efficiency.
Common causes: Common causes include Replace Diesel Particulate Filter (DPF).
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 428

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 26, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2002 Buick Description

The diesel exhaust aftertreatment system consists of an underhood 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 exhaust gas temperature at exhaust gas temperature sensor 4 is greater than 900°C (1652°F) for greater than 12 s.

OBDII Code P2002 Buick - Diesel Particulate Filter Low Efficiency - AutoCodes.com — P2002 Buick Code - Diesel Particulate Filter Low Efficiency

What does this mean?

What are the Possible Causes of the DTC P2002 Buick?

Replace Diesel Particulate Filter (DPF)

How to Fix the DTC P2002 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 P2002 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 P2002 Buick Code

1. What are the common symptoms of OBDII code P2002 in a Buick related to Diesel Particulate Filter Low Efficiency?

- Common symptoms may include reduced engine performance, black smoke from the exhaust, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P2002 in a Buick indicating Diesel Particulate Filter Low Efficiency?

- Common causes may include a clogged diesel particulate filter (DPF), faulty DPF temperature sensor, exhaust leaks, or issues with the DPF regeneration system.

3. How can I diagnose the Diesel Particulate Filter Low Efficiency issue in my Buick triggering OBDII code P2002?

- Diagnosis typically involves checking the DPF for clogs, inspecting the DPF temperature sensor, scanning for other related trouble codes, and ensuring proper operation of the DPF regeneration system.

4. Can I still drive my Buick with the OBDII code P2002 indicating Diesel Particulate Filter Low Efficiency?

- It is not recommended to drive the vehicle extensively with this code present, as it can lead to further damage to the engine and emissions system.

5. What are some possible repair tips for addressing OBDII code P2002 in a Buick due to Diesel Particulate Filter Low Efficiency?

- Repair tips may include performing a forced regeneration of the DPF, cleaning or replacing the DPF, checking and replacing the DPF temperature sensor, and inspecting for exhaust leaks.

6. How important is it to address OBDII code P2002 in a Buick related to Diesel Particulate Filter Low Efficiency promptly?

- It is crucial to address this issue promptly to prevent further damage to the emissions system, ensure optimal engine performance, and maintain compliance with emissions regulations.

7. Can I reset the check engine light after resolving the OBDII code P2002 in my Buick indicating Diesel Particulate Filter Low Efficiency?

- Yes, once the underlying issue has been addressed and repaired, the check engine light can be reset using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

8. Are there any maintenance practices that can help prevent OBDII code P2002 in a Buick related to Diesel Particulate Filter Low Efficiency?

- Regularly servicing the vehicle according to the manufacturer's recommendations, using high-quality diesel fuel, and avoiding prolonged idling can help prevent issues with the DPF and related systems.

9. How much does it typically cost to repair OBDII code P2002 in a Buick indicating Diesel Particulate Filter Low Efficiency?

- The cost of repair can vary depending on the specific issue causing the code, but it may involve expenses for parts such as DPF filters or sensors, labor costs, and diagnostic fees.

10. Is it possible to clear OBDII code P2002 in a Buick indicating Diesel Particulate Filter Low Efficiency without addressing the underlying issue?

- Clearing the code without addressing the underlying issue is not recommended, as the problem will persist and potentially lead to more severe issues with the vehicle's emissions system.