AutoCodes – Generic – P249F

P249F Code - Excessive Time To Enter Closed Loop DPF Regeneration Control

Quick Answer

Some manufacturers are now using a Diesel Exhaust Fluid (DEF) system commonly called a Selective Catalytic Reduction (SCR) system to reduce harmful Oxides of Nitrogen (NOx). Common causes include Exhaust Leaks, Fuel contamination, Faulty Diesel Particulate Filter (DPF). 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: P249F indicates Excessive Time To Enter Closed Loop DPF Regeneration Control.
Common causes: Common causes include Exhaust Leaks, Fuel contamination, Faulty Diesel Particulate Filter (DPF).
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 7,771

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 Jul 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P249F Description

Some manufacturers are now using a Diesel Exhaust Fluid (DEF) system commonly called a Selective Catalytic Reduction (SCR) system to reduce harmful Oxides of Nitrogen (NOx). The diesel exhaust fluid is a Urea based solution of approximately 32% Urea and 64% distilled water. The solution is injected into the exhaust gas stream upstream of the SCR catalyst. Once in the exhaust system it decomposes and becomes Ammonia (NH3) and Carbon dioxide (CO2). Within the catalyst, the NH3 and CO2 react with the Nox to create Oxygen (O2) and harmless Nitrogen (N2).
The system requires a storage tank for the diesel exhaust fluid, a pump with integrated level sensor, pressure sensor and fluid quality sensor, an injector fitted to the exhaust system, fluid heater and the catalyst. Sensors can also be fitted close to the SCR catalyst to monitor temperature during regeneration.
The system is closely monitored for correct operation as failure of the system will have a large impact on vehicle exhaust gas emissions of oxides of Nitrogen.

OBDII Code P249F - Excessive Time To Enter Closed Loop DPF Regeneration Control - AutoCodes.com — P249F Code - Excessive Time To Enter Closed Loop DPF Regeneration Control

What does this mean?

What are the Possible Causes of the DTC P249F?

Exhaust Leaks
Fuel contamination
Faulty Diesel Particulate Filter (DPF)
Faulty NOx Sensor
Diesel Exhaust Fluid
Faulty Selective Catalyst Reduction (SCR) Catalyst

How to Fix the DTC P249F?

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 P249F 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 P249F code?

Need more information on how to fix the P249F code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P249F code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P249F Ford — Excessive Time To Enter Closed Loop DPF Regeneration Control
P249F Mercedes-Benz — Excessive Time To Enter Closed Loop DPF Regeneration Control

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 P249F Code

1. What are common symptoms of OBDII code P249F?

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

2. What does OBDII code P249F indicate?

- OBDII code P249F indicates that there is excessive time required to enter closed loop Diesel Particulate Filter (DPF) regeneration control.

3. What are the possible causes of OBDII code P249F?

- Possible causes of this code include a faulty DPF pressure sensor, clogged DPF, exhaust leaks, or issues with the DPF regeneration system.

4. How can I diagnose the cause of OBDII code P249F?

- Diagnosing the cause of this code typically involves performing a thorough inspection of the DPF system, checking for exhaust leaks, and testing the DPF pressure sensor.

5. Can driving habits affect the occurrence of OBDII code P249F?

- Yes, driving habits such as frequent short trips or low-speed driving can contribute to the occurrence of this code by preventing proper DPF regeneration.

6. How can I repair OBDII code P249F?

- Repairing this code may involve cleaning or replacing the DPF, checking and repairing any exhaust leaks, replacing the DPF pressure sensor, and ensuring proper DPF regeneration.

7. Is it safe to continue driving with OBDII code P249F present?

- It is not recommended to continue driving with this code present, as it can lead to further issues with engine performance and emissions if left unresolved.

8. Can a DIY enthusiast fix OBDII code P249F at home?

- Depending on the underlying cause, some DIY enthusiasts may be able to address this code at home by inspecting the DPF system, replacing sensors, and performing basic repairs.

9. How often should I perform maintenance on the DPF system to prevent OBDII code P249F?

- Regular maintenance of the DPF system, including proper driving habits, periodic DPF regeneration, and timely sensor inspections, can help prevent the occurrence of this code.

10. Is OBDII code P249F a common issue in diesel vehicles?

- OBDII code P249F related to excessive time to enter closed loop DPF regeneration control is a common issue in diesel vehicles, particularly those equipped with DPF systems.