AutoCodes – Mercedes-Benz – P2049 Mercedes-Benz

P2049 Mercedes-Benz Code - Reductant Injection Valve Circuit High Bank 1 Unit 1

Quick Answer

The Diesel Exhaust Fluid (DEF) system is commonly called a Selective Catalytic Reduction (SCR) system to reduce harmful Oxides of Nitrogen (NOx). Common causes include Faulty Reductant Injection Valve, Reductant Injection Valve harness is open or shorted, Reductant Injection Valve circuit poor electrical connection. 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: P2049 Mercedes-Benz indicates Reductant Injection Valve Circuit High Bank 1 Unit 1.
Common causes: Common causes include Faulty Reductant Injection Valve, Reductant Injection Valve harness is open or shorted, Reductant Injection Valve circuit poor electrical connection.
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 602

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Oct 14, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2049 Mercedes-Benz Description

The Diesel Exhaust Fluid (DEF) system is 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).

OBDII Code P2049 Mercedes-Benz - Reductant Injection Valve Circuit High Bank 1 Unit 1 - AutoCodes.com — P2049 Mercedes-Benz Code - Reductant Injection Valve Circuit High Bank 1 Unit 1

What does this mean?

What are the Possible Causes of the DTC P2049 Mercedes-Benz?

Faulty Reductant Injection Valve
Reductant Injection Valve harness is open or shorted
Reductant Injection Valve circuit poor electrical connection

How to Fix the DTC P2049 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 P2049 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 P2049 Mercedes-Benz code?

Need more information on how to fix the P2049 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2049 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 P2049 Mercedes-Benz Code

1. What does the OBDII code P2049 mean on a Mercedes-Benz?

P2049 indicates a "Reductant Injection Valve Circuit High Bank 1 Unit 1," meaning there is a problem with the electrical circuit controlling the reductant injection valve, often related to the diesel exhaust fluid (DEF) system.

2. What are the common symptoms of code P2049 in a Mercedes-Benz?

Symptoms may include the check engine light turning on, decreased fuel efficiency, poor engine performance, and potential issues with the Selective Catalytic Reduction (SCR) system.

3. What causes code P2049 in a Mercedes-Benz?

Common causes include a faulty reductant injection valve, damaged wiring or connectors in the valve circuit, a defective control module, or issues with the diesel exhaust fluid system.

4. How do I diagnose the P2049 code on my Mercedes-Benz?

Start by inspecting the wiring and connectors for damage or corrosion, check the reductant injection valve for proper operation, and test the circuit for voltage and continuity using a multimeter.

5. Can a faulty reductant injection valve cause P2049?

Yes, a malfunctioning reductant injection valve can cause the circuit to malfunction and trigger the P2049 code.

6. Can I drive my Mercedes-Benz with the P2049 code active?

While the vehicle may be drivable, ignoring this code can lead to reduced efficiency of the SCR system and potential long-term damage to emissions components.

7. How is the P2049 code fixed in a Mercedes-Benz?

Repairs may include replacing the reductant injection valve, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the engine control module if necessary.

8. Is the P2049 code related to the diesel exhaust fluid (DEF) system?

Yes, the code is directly related to the DEF system, as the reductant injection valve is responsible for injecting DEF into the exhaust stream to reduce emissions.

9. What tools are needed to troubleshoot the P2049 code?

Youâ€™ll need an OBDII scanner, a multimeter for testing electrical circuits, and potentially a wiring diagram for your vehicle model.

10. How much does it cost to fix the P2049 code on a Mercedes-Benz?

Costs can vary depending on the issue, but replacing a reductant injection valve typically ranges from $200 to $600, including parts and labor. Wiring repairs may cost less, while control module replacement can be more expensive.