AutoCodes – Mercedes-Benz – P246C Mercedes-Benz

P246C Mercedes-Benz Code - Diesel Particulate Filter Restriction Forced Limited Power

Quick Answer

The Diesel Particulate Filter (DPF) is monitored for conditions where it may be overloaded. Common causes include Faulty Diesel Particulate Filter. 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 Mercedes-Benz indicates Diesel Particulate Filter Restriction Forced Limited Power.
Common causes: Common causes include Faulty Diesel Particulate Filter.
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.

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Code Popularity 3,018

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 15, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P246C Mercedes-Benz Description

The Diesel Particulate Filter (DPF) is monitored for conditions where it may be overloaded. The monitor compares the calculated restriction of the DPF to two thresholds. By exceeding the first threshold for a sufficient period of time, a wrench light will be illuminated. By exceeding the second threshold for a sufficient period of time, a wrench light and a MIL will be illuminated and engine output will be limited and EGR is disabled.

OBDII Code P246C Mercedes-Benz - Diesel Particulate Filter Restriction Forced Limited Power - AutoCodes.com — P246C Mercedes-Benz Code - Diesel Particulate Filter Restriction Forced Limited Power

What does this mean?

What are the Possible Causes of the DTC P246C Mercedes-Benz?

Faulty Diesel Particulate Filter

How to Fix the DTC P246C Mercedes-Benz?

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 does this mean?

Code Tech Notes

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P246C Mercedes-Benz 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.

Need more information about the P246C Mercedes-Benz code?

Need more information on how to fix the P246C Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P246C Mercedes-Benz 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 P246C Mercedes-Benz Code

1. What are the common symptoms of OBDII code P246C in a Mercedes-Benz related to the Diesel Particulate Filter Restriction Forced Limited Power issue?

- Common symptoms include reduced engine power, the vehicle going into limp mode, and the illumination of the check engine light.

2. What are the potential causes of the OBDII code P246C in a Mercedes-Benz?

- The code P246C typically indicates a restriction in the diesel particulate filter (DPF) due to excessive soot buildup or a malfunctioning DPF sensor.

3. How can I diagnose the Diesel Particulate Filter Restriction issue in my Mercedes-Benz?

- A diagnostic scan tool can be used to retrieve the OBDII code P246C and monitor live data related to the DPF system, such as pressure differentials and temperature readings.

4. What are some preventive maintenance tips to avoid the Diesel Particulate Filter Restriction issue in a Mercedes-Benz?

- Regularly driving the vehicle at highway speeds to allow for DPF regeneration, using high-quality diesel fuel, and following the manufacturer's recommended service intervals for DPF maintenance can help prevent issues.

5. Can I continue driving my Mercedes-Benz with the Diesel Particulate Filter Restriction Forced Limited Power problem?

- It is not recommended to drive the vehicle for an extended period with the restricted DPF, as it can lead to further engine damage and potential safety hazards. It's best to address the issue promptly.

6. How can I repair the Diesel Particulate Filter Restriction issue in my Mercedes-Benz?

- Repair options may include cleaning or replacing the diesel particulate filter, addressing any sensor or wiring faults, and performing a forced regeneration using specialized equipment.

7. Is it possible to clear the OBDII code P246C in a Mercedes-Benz without addressing the underlying issue?

- Clearing the code without fixing the root cause, such as excessive soot buildup or a faulty sensor, will likely result in the code reappearing once the system detects the ongoing issue.

8. Can a DIY enthusiast with basic automotive knowledge address the Diesel Particulate Filter Restriction issue in a Mercedes-Benz?

- While some maintenance tasks like checking for loose connections or inspecting the DPF for physical damage can be done by DIYers, diagnosing and repairing complex DPF issues may require professional expertise and specialized tools.

9. Are there any recalls or technical service bulletins related to the OBDII code P246C in Mercedes-Benz vehicles?

- It's recommended to check with authorized Mercedes-Benz service centers or visit the manufacturer's website to inquire about any recalls or technical service bulletins related to the DPF system and OBDII codes.

10. What is the typical cost to repair the Diesel Particulate Filter Restriction issue in a Mercedes-Benz?

- The cost of repairs can vary depending on the specific problem, parts needed, and labor rates. It's advisable to obtain estimates from reputable mechanics or dealerships before proceeding with the repairs.