P249C Mercedes-Benz Code - Excessive Time To Enter Closed Loop Reductant Injection 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 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
- P249C Mercedes-Benz indicates Excessive Time To Enter Closed Loop Reductant Injection Control.
- Common causes
- Common causes include Exhaust Leaks, Fuel contamination, Faulty 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.
Code P249C Mercedes-Benz Description
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.
What are the Possible Causes of the DTC P249C Mercedes-Benz?
- 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 P249C 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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P249C 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 P249C Mercedes-Benz code?
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Frequently Asked Questions about P249C Mercedes-Benz Code
1. What are the common symptoms of OBDII code P249C in a Mercedes-Benz?
- Common symptoms include the check engine light being illuminated, reduced engine performance, and potential issues with the vehicle's emissions system.
2. What can cause the OBDII code P249C to trigger in a Mercedes-Benz?
- This code is typically triggered by issues with the closed-loop reductant injection control system, such as a faulty reductant control module or a malfunctioning reductant injector.
3. How can I diagnose the cause of OBDII code P249C in my Mercedes-Benz?
- Diagnosing this code usually involves using a diagnostic scan tool to retrieve the specific fault codes, conducting visual inspections of the reductant injection system components, and performing functional tests on the system.
4. Is it safe to continue driving my Mercedes-Benz with the OBDII code P249C present?
- It is not recommended to continue driving the vehicle with this code present, as it can lead to increased emissions and potential damage to the catalytic converter over time.
5. Can I repair OBDII code P249C in my Mercedes-Benz myself?
- While some DIY enthusiasts may attempt to repair this code themselves, it is recommended to consult a professional mechanic with experience in diagnosing and repairing emissions system issues.
6. What are some common repair tips for addressing OBDII code P249C in a Mercedes-Benz?
- Common repair tips include checking and replacing the reductant injector, inspecting and testing the reductant control module, and ensuring proper connections and wiring in the system.
7. How much does it typically cost to repair OBDII code P249C in a Mercedes-Benz?
- The cost of repairing this code can vary depending on the specific issue causing it, but it may range from a few hundred to over a thousand dollars, including parts and labor.
8. Will resetting the check engine light resolve OBDII code P249C in my Mercedes-Benz?
- Resetting the check engine light may temporarily turn it off, but it will not fix the underlying issue causing the code to trigger. It is important to diagnose and address the root cause of the problem.
9. How long does it usually take to repair OBDII code P249C in a Mercedes-Benz?
- The repair time can vary depending on the complexity of the issue and the availability of parts, but it may take a few hours to a full day for a mechanic to diagnose and repair this code.
10. Can OBDII code P249C in a Mercedes-Benz cause any long-term damage if left unresolved?
- If left unresolved, this code can lead to increased emissions, reduced fuel efficiency, and potential damage to the catalytic converter, which can result in costly repairs in the long run.
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