Engine-Codes.com
Engine-Codes – Generic – P249E

P249E Code - Closed Loop Reductant Injection Control At Limit – Flow Too High

Quick Answer

The P249E diagnostic trouble code (DTC) indicates that the Closed Loop Reductant Injection Control system is operating at its limit, with the flow being too high. Common causes include Malfunctioning Reductant Injector: A faulty injector can lead to an excessive flow of reductant, triggering this code, Faulty Reductant Control Module: Issues with the control module responsible for regulating reductant injection can also cause high flow rates, Clogged or Damaged Reductant Supply Line: Obstructions or damage in the supply line can disrupt the flow of reductant, leading to this issue. 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
P249E indicates Closed Loop Reductant Injection Control At Limit – Flow Too High.
Common causes
Common causes include Malfunctioning Reductant Injector: A faulty injector can lead to an excessive flow of reductant, triggering this code, Faulty Reductant Control Module: Issues with the control module responsible for regulating reductant injection can also cause high flow rates, Clogged or Damaged Reductant Supply Line: Obstructions or damage in the supply line can disrupt the flow of reductant, leading to this issue.
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
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P249E Description

The P249E diagnostic trouble code (DTC) indicates that the Closed Loop Reductant Injection Control system is operating at its limit, with the flow being too high. This system is part of the vehicle's emissions control system, specifically related to the injection of a reductant (such as diesel exhaust fluid) into the exhaust stream to reduce harmful emissions. When the flow is too high, it can lead to an imbalance in the reductant injection process, potentially causing issues with emissions levels and overall engine performance.

OBDII Code P249E - Closed Loop Reductant Injection Control At Limit – Flow Too High
P249E Code - Closed Loop Reductant Injection Control At Limit – Flow Too High

Common Causes of P249E

  1. Malfunctioning Reductant Injector: A faulty injector can lead to an excessive flow of reductant, triggering this code.
  2. Faulty Reductant Control Module: Issues with the control module responsible for regulating reductant injection can also cause high flow rates.
  3. Clogged or Damaged Reductant Supply Line: Obstructions or damage in the supply line can disrupt the flow of reductant, leading to this issue.
  4. Reductant Tank Issues: Problems with the reductant tank, such as leaks or sensor malfunctions, can impact the flow of reductant in the system.
  5. Exhaust System Problems: Any damage or blockages in the exhaust system can affect the reductant injection process and result in high flow rates.

Symptoms of P249E

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the Check Engine Light on the vehicle's dashboard.
  2. Reduced Fuel Efficiency: A noticeable decrease in fuel efficiency may occur due to the imbalance in the reductant injection system.
  3. Rough Running Engine: The engine may experience rough idling or hesitation while driving, indicating potential issues with the reductant injection process.
  4. Increased Emissions: The vehicle may fail emissions tests or emit higher levels of pollutants due to the malfunctioning reductant injection system.

How to Fix P249E

  1. Diagnose the Issue: Use a diagnostic scan tool to retrieve the DTC and perform further testing to pinpoint the exact cause of the high reductant flow.
  2. Inspect Reductant System Components: Check the reductant injector, control module, supply line, tank, and exhaust system for any visible damage or malfunctions.
  3. Replace Faulty Components: Replace any defective parts identified during the inspection, such as the reductant injector, control module, or damaged supply line.
  4. Clear Codes and Test Drive: After repairs are completed, clear the DTC from the vehicle's computer system and test drive the vehicle to ensure the issue has been resolved.
  5. Monitor Emissions: Monitor the vehicle's emissions levels after repair to verify that the reductant injection system is functioning properly and emissions are within acceptable limits.

Cost to Fix P249E

The cost of repairing a P249E code can vary depending on the specific cause of the issue and the vehicle's make and model. On average, the repair costs for addressing this problem can range from $200 to $600, including parts and labor. However, it's important to note that labor rates at auto repair shops can vary, typically ranging between $80 and $150 per hour. Additionally, the cost of any necessary replacement parts will also contribute to the total repair bill. It's advisable to consult with a trusted mechanic or repair shop for a more accurate estimate based on the specific circumstances of the vehicle.

Need more information about the P249E code?

Need more information on how to fix the P249E code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P249E code diagnosed by a professional: Find a repair shop in your area

Code P249E Information for Specific Makes

  • P249E Chevrolet — Closed Loop Reductant Injection Control At Limit – Flow Too High
  • P249E Ford — Closed Loop Reductant Injection Control At Limit - Flow Too High
  • P249E GMC — Closed Loop Reductant Injection Control At Limit – Flow Too High
  • P249E Mercedes-Benz — Closed Loop Reductant Injection Control At Limit - Flow Too High
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 P249E Code

1. What are the common symptoms of OBDII code P249E?

The common symptoms of code P249E include the check engine light coming on, reduced engine power, decreased fuel efficiency, and potential exhaust system issues.

2. What can cause OBDII code P249E to trigger?

Code P249E is typically triggered by issues such as a malfunctioning reductant injector, a faulty reductant pump, clogged reductant lines, or problems with the reductant control module.

3. How serious is OBDII code P249E?

While code P249E may not cause immediate harm to the vehicle, it can lead to reduced performance, increased emissions, and potential damage to the exhaust system if left unresolved. It is recommended to address this code promptly.

4. What are some repair tips for OBDII code P249E?

Repairing code P249E may involve checking and cleaning the reductant injector, testing the reductant pump, inspecting the reductant lines for blockages, and ensuring the proper functioning of the reductant control module.

5. Can I drive with OBDII code P249E?

It is not recommended to drive with code P249E present, as it can lead to poor engine performance and increased emissions. It is best to address the underlying issue as soon as possible.

6. How do I diagnose OBDII code P249E?

Diagnosing code P249E typically involves using an OBDII scanner to retrieve the code, inspecting the reductant system components for any visible issues, and conducting tests to pinpoint the exact cause of the problem.

7. Will resetting the OBDII code P249E make it go away?

Resetting the code may temporarily turn off the check engine light, but it will not fix the underlying issue causing code P249E. It is important to diagnose and repair the problem to prevent it from recurring.

8. How much does it cost to repair OBDII code P249E?

The cost of repairing code P249E can vary depending on the specific cause of the issue, the labor rates in your area, and the parts needed for the repair. It is recommended to get a professional diagnosis for an accurate cost estimate.

9. Can a DIY enthusiast fix OBDII code P249E?

While some aspects of diagnosing and repairing code P249E may be possible for experienced DIY enthusiasts, dealing with the reductant system components can be complex. It is advisable to seek professional help for accurate diagnosis and repair.

10. How often does OBDII code P249E occur in vehicles?

Code P249E is relatively uncommon compared to other OBDII codes, but it can still occur in vehicles equipped with a reductant system. Proper maintenance and timely repairs can help prevent this code from appearing.

Discuss the causes and fixes for P249E OBDII Code

Submit a New Comment

Code P249E comments

No comments found for this page.