AutoCodes – GMC – U026B GMC

U026B GMC 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 GMC 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 528

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

What does this mean?

What are the Possible Causes of the DTC U026B GMC?

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 GMC?

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 GMC 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 GMC Code

1. What are the common symptoms of OBDII code U026B (GMC) - Lost Communication With Left Rear Short Range Radar Sensor Module?

- The common symptoms include malfunctioning rear parking assist system, disabled blind spot monitoring, and warning lights on the dashboard.

2. What are the possible causes of OBDII code U026B (GMC)?

- The code U026B can be triggered by a faulty left rear short range radar sensor module, damaged wiring or connectors, software issues, or a communication network problem.

3. How can I diagnose the cause of OBDII code U026B (GMC)?

- Diagnosis typically involves using a scan tool to retrieve the code, checking the wiring and connectors for any visible damage, and testing the left rear short range radar sensor module for proper functionality.

4. Is it safe to continue driving with OBDII code U026B (GMC) present?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to ensure the proper functioning of safety features like parking assist and blind spot monitoring.

5. Can I repair OBDII code U026B (GMC) on my own?

- While some DIY enthusiasts may be able to address this issue themselves by checking wiring and connections, it is recommended to consult a professional technician for a proper diagnosis and repair.

6. What are some tips for repairing OBDII code U026B (GMC)?

- Tips for repairing this code may include checking for loose or damaged wiring, ensuring proper connections, resetting the system, updating software if needed, and replacing the left rear short range radar sensor module if faulty.

7. How much does it typically cost to repair OBDII code U026B (GMC)?

- The cost of repair can vary depending on the root cause of the issue. It may range from a simple wiring repair cost to the replacement of the left rear short range radar sensor module, which can be more expensive.

8. Will resetting the OBDII code U026B (GMC) make it go away permanently?

- Resetting the code may temporarily clear the error, but if the underlying issue is not fixed, the code is likely to reappear. It is important to diagnose and repair the root cause to prevent recurrence.

9. Can extreme weather conditions affect OBDII code U026B (GMC) triggering?

- Extreme weather conditions, such as heavy rain or snow, can potentially affect the functionality of the radar sensor module and trigger the U026B code. It is advisable to keep the sensors clean and protected.

10. Is the OBDII code U026B (GMC) specific to certain GMC models only?

- The code U026B related to lost communication with the left rear short range radar sensor module is specific to GMC vehicles equipped with this particular sensor system.