AutoCodes – Chevrolet – P2002 Chevrolet

P2002 Chevrolet 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 Chevrolet 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 2,142

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

What does this mean?

What are the Possible Causes of the DTC P2002 Chevrolet?

Replace Diesel Particulate Filter (DPF)

How to Fix the DTC P2002 Chevrolet?

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 Chevrolet 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 P2002 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2002 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 Chevrolet Code

1. What are the common symptoms of OBDII code P2002 in a Chevrolet related to Diesel Particulate Filter (DPF) low efficiency?

- Common symptoms include reduced engine performance, decreased fuel efficiency, black smoke from the exhaust, and a possible illuminated check engine light.

2. What are the possible causes of OBDII code P2002 in a Chevrolet indicating Diesel Particulate Filter low efficiency?

- Potential causes include a clogged or faulty DPF, issues with the exhaust system, sensor malfunctions, or engine tuning problems.

3. How can I diagnose the OBDII code P2002 in a Chevrolet to confirm Diesel Particulate Filter low efficiency?

- Diagnosis typically involves scanning the vehicle for trouble codes, inspecting the DPF for blockages, checking exhaust system components, and testing sensors for proper functioning.

4. What are some repair tips for addressing OBDII code P2002 in a Chevrolet related to Diesel Particulate Filter low efficiency?

- Repair options may include cleaning or replacing the DPF, addressing exhaust system leaks, repairing or replacing faulty sensors, and ensuring proper engine tuning.

5. Can driving habits affect the occurrence of OBDII code P2002 in a Chevrolet due to Diesel Particulate Filter low efficiency?

- Yes, frequent short trips with insufficient engine warm-up time can contribute to DPF issues. Regularly driving at high speeds on highways can help prevent DPF clogging.

6. Is it safe to continue driving a Chevrolet with an active OBDII code P2002 indicating Diesel Particulate Filter low efficiency?

- It is not recommended to drive for an extended period with this issue unresolved, as it can lead to further damage to the engine or emissions system.

7. How much does it typically cost to repair OBDII code P2002 in a Chevrolet caused by Diesel Particulate Filter low efficiency?

- Repair costs can vary depending on the exact cause and required repairs, but they may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can I reset the OBDII code P2002 in a Chevrolet related to Diesel Particulate Filter low efficiency without addressing the underlying issue?

- Resetting the code without fixing the root problem will only temporarily turn off the check engine light. The issue will likely resurface, and it's crucial to address the cause.

9. Are there any preventative maintenance steps I can take to avoid OBDII code P2002 in a Chevrolet due to Diesel Particulate Filter low efficiency?

- Regularly servicing the vehicle according to manufacturer recommendations, using high-quality fuel, and driving at varying speeds to aid DPF regeneration can help prevent this issue.

10. Can a DIY enthusiast with automotive knowledge repair OBDII code P2002 in a Chevrolet caused by Diesel Particulate Filter low efficiency?

- Depending on the exact cause, some repairs related to the DPF or exhaust system may be possible for experienced DIYers. However, diagnosing and addressing sensor or tuning issues may require professional expertise.