AutoCodes – Cadillac – P2002 Cadillac

P2002 Cadillac 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 Cadillac 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 606

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

What does this mean?

What are the Possible Causes of the DTC P2002 Cadillac?

Replace Diesel Particulate Filter (DPF)

How to Fix the DTC P2002 Cadillac?

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 Cadillac 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 Cadillac Code

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

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

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

Possible causes include a clogged or damaged diesel particulate filter (DPF), faulty DPF sensor, issues with the exhaust system, or engine problems affecting the DPF's regeneration process.

3. How can I diagnose the OBDII code P2002 in a Cadillac related to Diesel Particulate Filter Low Efficiency?

Diagnosis involves using an OBDII scanner to retrieve the trouble codes, inspecting the DPF system for any physical damage or blockages, checking the DPF sensor's functionality, and examining the exhaust system components.

4. What are some repair tips for resolving OBDII code P2002 in a Cadillac due to Diesel Particulate Filter Low Efficiency?

Repair tips include cleaning or replacing the diesel particulate filter, repairing any exhaust leaks, ensuring proper engine maintenance to facilitate DPF regeneration, and resetting the fault codes after repairs.

5. Can I continue driving my Cadillac with OBDII code P2002, indicating Diesel Particulate Filter Low Efficiency?

It is not recommended to continue driving with this code unresolved as it can lead to further engine damage and potentially cause the vehicle to fail emissions tests. Immediate attention and repair are advised.

6. How much does it typically cost to repair OBDII code P2002 for Diesel Particulate Filter Low Efficiency in a Cadillac?

The cost of repairs can vary depending on the extent of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Are there any preventive maintenance measures to avoid OBDII code P2002 related to Diesel Particulate Filter Low Efficiency in a Cadillac?

Regularly servicing the vehicle, using high-quality diesel fuel, driving at highway speeds to aid DPF regeneration, and addressing any engine issues promptly can help prevent this code from occurring.

8. Can a DIY enthusiast fix OBDII code P2002 for Diesel Particulate Filter Low Efficiency in a Cadillac?

While some basic troubleshooting and maintenance tasks can be performed by DIY enthusiasts, diagnosing and repairing complex DPF-related issues may require specialized tools and expertise best handled by a professional mechanic.

9. How long does it take to repair OBDII code P2002 for Diesel Particulate Filter Low Efficiency in a Cadillac?

The repair time can vary based on the specific cause of the issue and the complexity of the repair process. It may take a few hours to a full day, depending on the extent of the repairs needed.

10. Can resetting the check engine light resolve OBDII code P2002 in a Cadillac related to Diesel Particulate Filter Low Efficiency?

Simply resetting the check engine light without addressing the underlying issue will not fix the problem. It is essential to diagnose the root cause of the code and perform the necessary repairs to prevent it from reoccurring.