AutoCodes – Buick – U026B Buick

U026B Buick Code - Lost Communication With Left Rear Short Range Radar Sensor Module

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Left Rear Short Range Radar Sensor Module, Left Rear Short Range Radar Sensor Module harness is open or shorted, Left Rear Short Range Radar Sensor 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: U026B Buick indicates Lost Communication With Left Rear Short Range Radar Sensor Module.
Common causes: Common causes include Faulty Left Rear Short Range Radar Sensor Module, Left Rear Short Range Radar Sensor Module harness is open or shorted, Left Rear Short Range Radar Sensor 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 595

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 Apr 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U026B Buick Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules 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 module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Left Rear Short Range Radar Sensor Module has not been received.

OBDII Code U026B Buick - Lost Communication With Left Rear Short Range Radar Sensor Module - AutoCodes.com — U026B Buick Code - Lost Communication With Left Rear Short Range Radar Sensor Module

What does this mean?

What are the Possible Causes of the DTC U026B Buick?

Faulty Left Rear Short Range Radar Sensor Module
Left Rear Short Range Radar Sensor Module harness is open or shorted
Left Rear Short Range Radar Sensor Module circuit poor electrical connection

How to Fix the DTC U026B 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 U026B 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 U026B Buick Code

1. What are common symptoms of the OBDII code U026B related to the left rear short-range radar sensor module?

- Common symptoms include a malfunctioning blind spot monitoring system, loss of rear cross-traffic alert functionality, and potential warning messages on the dashboard.

2. What are possible causes of the U026B trouble code indicating lost communication with the left rear radar sensor module in a Buick?

- Possible causes may include a faulty radar sensor module, damaged wiring or connectors, a blown fuse, or issues with the body control module.

3. How can I diagnose the U026B code for lost communication with the left rear radar sensor module in my Buick?

- Diagnosis involves checking the wiring and connectors for damage, ensuring proper power supply to the module, and using a diagnostic scanner to communicate with the radar sensor module.

4. Can I repair the U026B trouble code related to the left rear radar sensor module in my Buick myself?

- If you have experience with automotive repairs and access to the necessary tools, you may be able to repair the issue yourself by addressing damaged wiring, replacing the radar sensor module, or checking and replacing relevant fuses.

5. Is it safe to drive my Buick with the U026B code indicating lost communication with the left rear radar sensor module?

- While your Buick may still be operable, it is not recommended to drive with this code present as it can impact important safety features like blind spot monitoring and rear cross-traffic alert.

6. How much does it typically cost to repair the U026B code for the left rear radar sensor module in a Buick?

- Repair costs can vary depending on the specific issue causing the code, but expect to pay for diagnostic time, replacement parts, and labor. Costs may range from a few hundred to over a thousand dollars.

7. Can resetting the trouble codes clear the U026B code associated with the left rear radar sensor module in my Buick?

- Resetting the trouble codes may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It's important to diagnose and fix the root cause of the problem.

8. Are there any recalls or technical service bulletins related to the U026B trouble code in Buick vehicles?

- It's advisable to check with your local Buick dealership or visit the National Highway Traffic Safety Administration (NHTSA) website to see if there are any recalls or technical service bulletins related to the U026B code for your specific Buick model.

9. How long does it typically take to repair the U026B code for lost communication with the left rear radar sensor module?

- The repair time can vary depending on the exact cause of the issue and the complexity of the repair. It may take anywhere from a few hours to a full day to address the problem and clear the trouble code.

10. What steps can I take to prevent the U026B trouble code from occurring again after repair?

- To prevent the U026B code from reoccurring, make sure to perform regular maintenance checks, address any wiring or connector issues promptly, and follow the manufacturer's recommended service schedule for your Buick.