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Engine-Codes – Generic – P246C

P246C Code - Diesel Particulate Filter Restriction Forced Limited Power

Quick Answer

The P246C diagnostic trouble code (DTC) refers to a Diesel Particulate Filter (DPF) restriction that is causing the engine to go into a forced limited power mode. Common causes include Accumulation of soot and ash in the DPF, Short driving cycles that do not allow for proper regeneration of the DPF, Low-quality fuel with high sulfur content. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P246C indicates Diesel Particulate Filter Restriction Forced Limited Power.
Common causes
Common causes include Accumulation of soot and ash in the DPF, Short driving cycles that do not allow for proper regeneration of the DPF, Low-quality fuel with high sulfur content.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code P246C Description

The P246C diagnostic trouble code (DTC) refers to a Diesel Particulate Filter (DPF) restriction that is causing the engine to go into a forced limited power mode. This code is typically found in diesel vehicles equipped with a DPF system, which is designed to trap and burn off harmful particulate matter in the exhaust gases. When the DPF becomes restricted or clogged, it can lead to a decrease in engine power and performance.

OBDII Code P246C - Diesel Particulate Filter Restriction Forced Limited Power
P246C Code - Diesel Particulate Filter Restriction Forced Limited Power

Common Causes of P246C

  1. Accumulation of soot and ash in the DPF
  2. Short driving cycles that do not allow for proper regeneration of the DPF
  3. Low-quality fuel with high sulfur content
  4. Faulty DPF pressure sensor
  5. Engine problems causing excessive particulate matter emissions

Symptoms of P246C

  1. Reduced engine power
  2. Decreased fuel efficiency
  3. Engine misfires
  4. Black smoke from the exhaust
  5. Illuminated check engine light

How to Fix P246C

  1. Perform a diagnostic scan to confirm the P246C code and identify the specific cause of the DPF restriction.
  2. Inspect the DPF for excessive soot and ash buildup and clean or replace the filter as needed.
  3. Check the DPF pressure sensor for proper operation and replace if faulty.
  4. Perform a forced regeneration of the DPF to burn off any accumulated soot and ash.
  5. Address any underlying engine issues that may be contributing to the DPF restriction.

Cost to Fix P246C

The cost of repairing a Diesel Particulate Filter restriction forced limited power issue can vary depending on the extent of the problem and the specific repairs needed. In general, the cost of cleaning or replacing a DPF filter can range from $500 to $2000, including parts and labor. Additional costs may be incurred if other components such as the DPF pressure sensor need to be replaced. It is recommended to consult with a qualified mechanic or dealership for a more accurate cost estimate based on the specific vehicle make and model. Labor rates at auto repair shops typically range from $80 to $150 per hour, but can vary based on location and other factors.

What does this mean?

Tech Notes for P246C

To resolve this, you have to change the Diesel Particulate Filter and reset the code with an OBDII scanner.

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Code P246C Information for Specific Makes

  • P246C Chevrolet — Diesel Particulate Filter Restriction Forced Limited Power
  • P246C Dodge — Diesel Particulate Filter Restriction Forced Limited Power
  • P246C Ford — Diesel Particulate Filter Restriction Forced Limited Power
  • P246C GMC — Diesel Particulate Filter Restriction Forced Limited Power
  • P246C Mercedes-Benz — Diesel Particulate Filter Restriction Forced Limited Power
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 P246C Code

1. What are the common symptoms of OBDII code P246C (Diesel Particulate Filter Restriction Forced Limited Power)?

- Common symptoms include reduced engine power, decreased fuel efficiency, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P246C?

- The code P246C is typically triggered by a clogged diesel particulate filter (DPF), faulty DPF sensor, exhaust system issues, or engine control module (ECM) malfunction.

3. How can I diagnose OBDII code P246C at home?

- You can diagnose P246C by using an OBDII scanner to retrieve the fault codes, inspecting the DPF for blockages, checking the DPF pressure sensor, and examining the exhaust system for leaks or damage.

4. What are the repair options for OBDII code P246C?

- Repair options may include cleaning or replacing the DPF, replacing the DPF pressure sensor, repairing any exhaust system leaks, and resetting the ECM to clear the code.

5. Can I continue driving with OBDII code P246C present?

- It is not recommended to continue driving with code P246C as it can lead to further damage to the engine and emissions system. It is best to address the issue promptly.

6. How much does it typically cost to repair OBDII code P246C?

- The cost of repairing code P246C 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 tips to avoid OBDII code P246C?

- Regularly servicing your diesel vehicle, using high-quality fuel, driving at highway speeds to aid DPF regeneration, and avoiding short trips can help prevent issues leading to code P246C.

8. Can a DIY enthusiast fix OBDII code P246C at home?

- While some aspects of diagnosing and repairing code P246C can be done at home by experienced DIY enthusiasts, specialized equipment and knowledge may be required for certain repairs, so professional help is often recommended.

9. How long does it take to repair OBDII code P246C?

- The repair time for code P246C can vary depending on the specific cause and extent of the issue. Simple fixes may take a few hours, while more complex repairs could take a day or longer.

10. Will resetting the ECM clear OBDII code P246C permanently?

- Resetting the ECM may clear the code temporarily, but if the underlying issue causing code P246C is not addressed, the code is likely to return. It is essential to diagnose and fix the root cause for a permanent solution.

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