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Engine-Codes – Generic – P2049

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

Quick Answer

The P2049 diagnostic trouble code (DTC) indicates a problem with the reductant injection valve circuit on Bank 1 Unit 1 of the vehicle. Common causes include Faulty reductant injection valve, Wiring or connector issues in the circuit, Corrosion or damage to the valve circuit. 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 indicates Reductant Injection Valve Circuit High Bank 1 Unit 1.
Common causes
Common causes include Faulty reductant injection valve, Wiring or connector issues in the circuit, Corrosion or damage to the valve circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P2049 Description

The P2049 diagnostic trouble code (DTC) indicates a problem with the reductant injection valve circuit on Bank 1 Unit 1 of the vehicle. In modern diesel vehicles equipped with Selective Catalytic Reduction (SCR) systems, reductant injection valves are responsible for injecting Diesel Exhaust Fluid (DEF) into the exhaust stream to reduce harmful emissions. The reductant injection valve circuit high fault suggests that there is a high voltage condition in the circuit, which could be caused by a variety of issues.

OBDII Code P2049 - Reductant Injection Valve Circuit High Bank 1 Unit 1
P2049 Code - Reductant Injection Valve Circuit High Bank 1 Unit 1

Common Causes of P2049

  1. Faulty reductant injection valve.
  2. Wiring or connector issues in the circuit.
  3. Corrosion or damage to the valve circuit.
  4. ECM software issues.
  5. High voltage in the circuit due to a short circuit or electrical fault.

Symptoms of P2049

  1. Illumination of the Check Engine Light.
  2. Reduced engine performance or power loss.
  3. Increased fuel consumption.
  4. Increased emissions output.
  5. Potential for the vehicle to go into a reduced power mode.

How to Fix P2049

  1. Begin by conducting a visual inspection of the reductant injection valve and its wiring harness for any visible damage or corrosion.
  2. Use a multimeter to test the voltage and continuity in the circuit to pinpoint the source of the issue.
  3. Check the ECM for any software updates or reprogramming that may be necessary to address the fault.
  4. Replace the reductant injection valve if it is found to be faulty, ensuring proper installation and connection.
  5. Clear the DTC and conduct a test drive to verify that the issue has been resolved.

Cost to Fix P2049

The cost of repairing a P2049 code can vary depending on the specific cause of the issue. Typically, the cost of replacing a faulty reductant injection valve can range from $200 to $500, including parts and labor. Additional costs may apply if wiring repairs or ECM reprogramming is needed. It is recommended to consult with a professional mechanic to get an accurate estimate based on the specific vehicle make and model, as well as any additional diagnostics or repairs that may be required. Labor rates at auto repair shops can vary, so it's advisable to inquire about pricing before proceeding with the repairs.

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Code P2049 Information for Specific Makes

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.

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