AutoCodes – Chevrolet – U026B Chevrolet

U026B Chevrolet 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 Chevrolet 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 2,252

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

What does this mean?

What are the Possible Causes of the DTC U026B Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet Code

What does OBDII code U026B mean on a Chevrolet?

Code U026B indicates a loss of communication with the Left Rear Short Range Radar Sensor Module, which is part of the vehicle's driver assistance systems like blind spot detection.

What are the common symptoms of code U026B?

Symptoms may include the blind spot monitoring system being disabled, a warning light on the dashboard, or error messages related to driver assistance features.

What causes code U026B to trigger?

Common causes include a faulty left rear radar sensor, damaged wiring or connectors, water intrusion, or a malfunction in the control module communicating with the sensor.

Can a loose connection cause code U026B?

Yes, a loose or corroded connector at the left rear radar sensor can disrupt communication and trigger this code.

How do I diagnose code U026B on my Chevrolet?

Start by inspecting the wiring and connectors for the left rear radar sensor. Use a scan tool to verify if the sensor is responding and check for related codes that may indicate broader system issues.

Is it safe to drive with code U026B active?

While the vehicle may still be drivable, safety features like blind spot monitoring or rear cross-traffic alerts may not function properly, increasing the risk of accidents.

How do I fix code U026B on a Chevrolet?

Repairs may involve replacing the left rear radar sensor, repairing damaged wiring, cleaning corroded connectors, or reprogramming the control module if needed.

Can a software issue cause code U026B?

Yes, outdated or corrupted software in the vehicleâ€™s control module can cause communication errors with the radar sensor. Updating the software may resolve the issue.

How much does it cost to fix code U026B?

Repair costs depend on the root cause. Replacing the radar sensor may cost $300-$600, while wiring repairs or software updates are typically less expensive.

Do I need a professional to fix code U026B?

While basic inspections like checking connectors can be done at home, diagnosing and replacing radar sensors or updating software often requires a professional with specialized tools.