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

Quick Answer

The U2627 Buick code indicates that the Reductant Control Module (RCM) has lost communication with the Reductant Level Sensor in the vehicle's emissions control system. Common causes include Faulty Reductant Level Sensor, Wiring issues or corrosion in the communication circuit, Malfunctioning Reductant Control Module. 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 Buick indicates Reductant Control Module Lost Communication With Reductant Level Sensor.
Common causes
Common causes include Faulty Reductant Level Sensor, Wiring issues or corrosion in the communication circuit, Malfunctioning Reductant Control Module.
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 13, 2024
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Code U2627 Buick Description

The U2627 Buick code indicates that the Reductant Control Module (RCM) has lost communication with the Reductant Level Sensor in the vehicle's emissions control system. The Reductant Control Module is responsible for managing the injection of diesel exhaust fluid (DEF) into the exhaust system to reduce harmful emissions. The Reductant Level Sensor, on the other hand, monitors the level of DEF in the tank and sends this information to the RCM for proper dosing.

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

Common Causes of U2627 Buick

  1. Faulty Reductant Level Sensor
  2. Wiring issues or corrosion in the communication circuit
  3. Malfunctioning Reductant Control Module
  4. Software glitches or communication errors
  5. DEF contamination or quality issues

Symptoms of U2627 Buick

  1. Check Engine Light illuminated
  2. Reduced fuel efficiency
  3. Increased emissions output
  4. Drivability issues
  5. Difficulty starting the vehicle

How to Fix U2627 Buick

  1. Diagnose the issue using a diagnostic scanner to retrieve the trouble codes and pinpoint the source of the communication loss.
  2. Inspect the wiring harness and connectors for any damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test the Reductant Level Sensor for proper function and replace if faulty.
  4. Check the Reductant Control Module for any malfunctions or software glitches. Update or replace as necessary.
  5. Clear the trouble codes, reset the system, and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix U2627 Buick

The typical repair costs for addressing the U2627 Buick code can vary depending on the specific cause of the communication loss and the parts needed for repair. In general, the cost of replacing a Reductant Level Sensor can range from $150 to $300, while a new Reductant Control Module may cost between $300 and $600. Labor costs at auto repair shops can range from $80 to $150 per hour, and the total repair bill could amount to several hundred dollars. It is advisable to consult with a trusted mechanic or dealership for a more accurate estimate based on the vehicle's 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 Buick Code

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

The common symptoms of code U2627 include the Check Engine light coming on, reduced engine performance, and potential issues with the vehicle's emissions system.

2. What does the OBDII code U2627 in a Buick indicate?

OBDII code U2627 indicates that the Reductant Control Module has lost communication with the Reductant Level Sensor in the vehicle's emissions system.

3. What are the possible causes of the U2627 code in a Buick?

Possible causes of code U2627 include a faulty Reductant Level Sensor, damaged wiring or connectors in the system, or a malfunctioning Reductant Control Module.

4. How can I diagnose the U2627 code in my Buick?

Diagnosing the U2627 code typically involves using a diagnostic scanner to retrieve the specific fault codes, checking the wiring and connectors for any damage, and testing the Reductant Level Sensor for proper functionality.

5. Can I still drive my Buick with the U2627 code present?

While it may be possible to drive the vehicle with the U2627 code present, it is recommended to address the issue promptly to prevent potential damage to the emissions system and ensure optimal engine performance.

6. How can I repair the U2627 code in my Buick?

Repairing the U2627 code may involve replacing the Reductant Level Sensor, repairing any damaged wiring or connectors, or reprogramming the Reductant Control Module to restore communication with the sensor.

7. Will resetting the trouble codes make the U2627 code go away?

Resetting the trouble codes may temporarily clear the Check Engine light, but if the underlying issue causing the U2627 code is not addressed, the code is likely to reappear once the vehicle is driven and the system performs self-tests.

8. Is the U2627 code a serious issue in a Buick?

While the U2627 code may not cause immediate drivability issues, it is important to address it promptly to ensure proper functioning of the emissions system and prevent potential long-term damage to the vehicle.

9. Can a DIY enthusiast fix the U2627 code in a Buick?

Depending on their experience level, a DIY enthusiast may be able to diagnose and repair the U2627 code by following repair guides and using the necessary tools. However, professional assistance may be needed for more complex repairs.

10. How can I prevent the U2627 code from recurring in my Buick?

To prevent the U2627 code from recurring, it is important to perform regular maintenance on the vehicle's emissions system, address any issues promptly, and follow the manufacturer's recommended service schedule.

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