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Engine-Codes – GMC – U2627 GMC

U2627 GMC Code - Reductant Control Module Lost Communication With Reductant Level Sensor

Quick Answer

The U2627 diagnostic trouble code (DTC) for GMC vehicles indicates that the Reductant Control Module has lost communication with the Reductant Level Sensor. Common causes include Faulty Reductant Control Module, Defective Reductant Level Sensor, Wiring or connection issues between the module and sensor. 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
U2627 GMC indicates Reductant Control Module Lost Communication With Reductant Level Sensor.
Common causes
Common causes include Faulty Reductant Control Module, Defective Reductant Level Sensor, Wiring or connection issues between the module and sensor.
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 14, 2024
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Code U2627 GMC Description

The U2627 diagnostic trouble code (DTC) for GMC vehicles indicates that the Reductant Control Module has lost communication with the Reductant Level Sensor. In modern diesel vehicles equipped with Selective Catalytic Reduction (SCR) systems, the Reductant Control Module is responsible for managing the injection of Diesel Exhaust Fluid (DEF) into the exhaust stream to reduce harmful emissions. The Reductant Level Sensor, on the other hand, monitors the DEF level in the tank to ensure proper operation of the system.

OBDII Code U2627 GMC - Reductant Control Module Lost Communication With Reductant Level Sensor
U2627 GMC Code - Reductant Control Module Lost Communication With Reductant Level Sensor

Common Causes of U2627 GMC

  1. Faulty Reductant Control Module
  2. Defective Reductant Level Sensor
  3. Wiring or connection issues between the module and sensor
  4. Corrosion or damage to the components
  5. Software or programming issues within the vehicle's computer system

Symptoms of U2627 GMC

  1. Illumination of the check engine light
  2. Reduced engine power or performance
  3. Failed emissions test
  4. Increased fuel consumption
  5. Difficulty starting the vehicle

How to Fix U2627 GMC

  1. Perform a diagnostic scan to confirm the U2627 code and identify the specific issue.
  2. Inspect the wiring and connections between the Reductant Control Module and Reductant Level Sensor for any damage or corrosion.
  3. Test the Reductant Level Sensor to ensure it is functioning correctly.
  4. Replace the Reductant Control Module or Reductant Level Sensor if either component is found to be faulty.
  5. Clear the DTC and reset the vehicle's computer system to ensure the issue has been resolved.

Cost to Fix U2627 GMC

The cost of repairing a U2627 code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. In general, replacing the Reductant Control Module or Reductant Level Sensor can range from $200 to $500 for parts, with additional labor costs of $100 to $200. Diagnostic time and labor rates at auto repair shops typically range from $80 to $150 per hour. It is advisable to check with local repair shops for a more accurate estimate based on your vehicle make and model.

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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 U2627 GMC Code

1. What are the common symptoms of OBDII code U2627 in a GMC vehicle?

The common symptoms include the check engine light illuminating, poor vehicle performance, and potential issues with the reductant system.

2. What can cause the U2627 code to appear in a GMC vehicle?

The U2627 code typically appears when there is a communication error between the reductant control module and the reductant level sensor. This can be caused by wiring issues, a faulty sensor, or a malfunctioning control module.

3. How can I diagnose the U2627 code in my GMC vehicle?

Diagnosing the U2627 code involves using a diagnostic scanner to retrieve the specific error codes, checking the wiring and connections between the control module and sensor, and testing the sensor for proper functionality.

4. Can I continue driving my GMC vehicle with the U2627 code present?

It is not recommended to drive your vehicle with the U2627 code present, as it can lead to potential issues with the reductant system and affect the vehicle's performance.

5. How can I repair the U2627 code in my GMC vehicle?

Repairing the U2627 code may involve repairing or replacing damaged wiring, replacing the reductant level sensor, or reprogramming the reductant control module. It is recommended to consult a professional mechanic for accurate diagnosis and repair.

6. Are there any DIY tips for fixing the U2627 code in a GMC vehicle?

While some basic checks like inspecting the wiring and connections can be done DIY, it is advisable to seek professional help for diagnosing and repairing the U2627 code to ensure proper resolution.

7. How much does it cost to repair the U2627 code in a GMC vehicle?

The cost of repairing the U2627 code can vary depending on the specific issue causing the code, the labor rates in your area, and the cost of parts needed for the repair. It is best to get a few quotes from different mechanics to compare prices.

8. Can resetting the trouble codes clear the U2627 code in a GMC vehicle?

Resetting the trouble codes may temporarily clear the U2627 code, but if the underlying issue causing the code is not addressed, it is likely to reappear. It is important to diagnose and repair the root cause of the code for a lasting solution.

9. Is the U2627 code a serious issue in a GMC vehicle?

While the U2627 code may not cause immediate harm to your vehicle, it is important to address it promptly to prevent potential issues with the reductant system and ensure optimal performance.

10. How can I prevent the U2627 code from reoccurring in my GMC vehicle?

Regular maintenance, such as checking the reductant system components for any signs of wear or damage, ensuring proper wiring connections, and addressing any related issues promptly, can help prevent the U2627 code from reoccurring.

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