AutoCodes – Cadillac – U026B Cadillac

U026B Cadillac 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 Cadillac 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 4,299

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC U026B Cadillac?

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 Cadillac?

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 Cadillac 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.

Need more information about the U026B Cadillac code?

Need more information on how to fix the U026B Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U026B Cadillac code diagnosed by a professional: Find a repair shop in your area

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 Cadillac Code

1. What does the OBDII code U026B mean on a Cadillac?

The U026B code indicates a loss of communication with the Left Rear Short Range Radar Sensor Module, which may affect features like blind spot detection or rear cross-traffic alert.

2. What are the symptoms of the U026B code on a Cadillac?

Symptoms may include malfunctioning or disabled driver assistance features, such as blind spot monitoring, warning lights on the dashboard, or a diagnostic trouble code stored in the system.

3. What causes the U026B code to appear on a Cadillac?

Common causes include a faulty radar sensor module, damaged wiring or connectors, software issues, or a problem with the vehicle's communication network.

4. Can I drive my Cadillac with the U026B code?

Yes, you can typically drive the vehicle, but safety features like blind spot detection or rear cross-traffic alert may not function properly, increasing the risk of accidents.

5. How do I diagnose the U026B code on my Cadillac?

Start by using a scan tool to confirm the code and check for additional codes. Inspect the radar sensor module, wiring, and connectors for damage or corrosion, and test the communication network.

6. How can I fix the U026B code on my Cadillac?

Repairs may include replacing the faulty radar sensor module, repairing or replacing damaged wiring or connectors, or updating the vehicle's software if applicable.

7. How much does it cost to fix the U026B code on a Cadillac?

Repair costs vary depending on the issue, but replacing a radar sensor module can range from $200 to $600, plus labor, while wiring repairs may cost less.

8. Can a weak battery cause the U026B code on a Cadillac?

Yes, a weak or failing battery can cause communication errors in the vehicle's systems, potentially triggering the U026B code.

9. Does the U026B code require a radar sensor calibration after repairs?

Yes, in most cases, the radar sensor module will need to be recalibrated after replacement or repair to ensure proper functionality of driver assistance features.

10. Is the U026B code covered under warranty for my Cadillac?

It depends on your vehicle's warranty coverage. Check with your dealership to see if the radar sensor module or related repairs are covered under the factory or extended warranty.