AutoCodes – Buick – U2626 Buick

U2626 Buick Code - Reductant Control Module Lost Communication With Engine Control Module On Powertrain Sensor CAN Bus

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine Control Module 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: U2626 Buick indicates Reductant Control Module Lost Communication With Engine Control Module On Powertrain Sensor CAN Bus.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine Control Module 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 518

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 18, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U2626 Buick Description

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device.
The Diagnostic Trouble Code (DTC) will set when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U2626 Buick - Reductant Control Module Lost Communication With Engine Control Module On Powertrain Sensor CAN Bus - AutoCodes.com — U2626 Buick Code - Reductant Control Module Lost Communication With Engine Control Module On Powertrain Sensor CAN Bus

What does this mean?

What are the Possible Causes of the DTC U2626 Buick?

Faulty Engine Control Module (ECM)
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection
Faulty Reductant Control Module

How to Fix the DTC U2626 Buick?

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 U2626 Buick 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.

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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 U2626 Buick Code

1. What are the common symptoms of OBDII code U2626 in a Buick?

- Common symptoms include the Check Engine light illuminating, reduced engine power, and potential issues with the vehicle's emission system.

2. What does the U2626 code "Reductant Control Module Lost Communication With Engine Control Module On Powertrain Sensor CAN Bus" mean?

- This code indicates a communication problem between the Reductant Control Module and the Engine Control Module through the Powertrain Sensor CAN Bus.

3. What are possible causes of the U2626 code in a Buick?

- Possible causes include wiring or connection issues, a faulty Reductant Control Module, a defective Engine Control Module, or problems with the Powertrain Sensor CAN Bus.

4. How can I diagnose the U2626 code in my Buick?

- Diagnosing this code typically involves using a diagnostic scanner to retrieve the code and checking the communication between the modules and the sensor using specialized equipment.

5. Is it safe to continue driving with the U2626 code present in a Buick?

- It is recommended to address the issue causing the U2626 code as soon as possible to prevent potential damage to the vehicle's emission system and ensure optimal engine performance.

6. Can I repair the U2626 code in my Buick by resetting the check engine light?

- Simply resetting the check engine light may temporarily clear the code, but it will not fix the underlying issue causing the communication problem between the modules.

7. How much does it cost to repair the U2626 code in a Buick?

- The cost of repair can vary depending on the exact cause of the code, but it may involve replacing faulty modules, repairing wiring issues, or addressing other related problems.

8. Are there any DIY tips for fixing the U2626 code in a Buick?

- DIY tips for addressing the U2626 code include checking for loose connections, inspecting wiring for damage, and ensuring all modules are properly connected and functioning.

9. Can a mechanic easily fix the U2626 code in a Buick?

- A qualified mechanic should be able to diagnose and repair the U2626 code by using diagnostic tools, performing necessary tests, and replacing any faulty components as needed.

10. How can I prevent the U2626 code from recurring in my Buick?

- Regular maintenance, checking for wiring issues, and addressing any related problems promptly can help prevent the U2626 code from reoccurring in your Buick.