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U026D Cadillac Code - Lost Communication With Rear Middle 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 Rear Middle Short Range Radar Sensor Module, Rear Middle Short Range Radar Sensor Module harness is open or shorted, Rear Middle 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: U026D Cadillac indicates Lost Communication With Rear Middle Short Range Radar Sensor Module.
Common causes: Common causes include Faulty Rear Middle Short Range Radar Sensor Module, Rear Middle Short Range Radar Sensor Module harness is open or shorted, Rear Middle 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 783

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 U026D 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 Rear Middle Short Range Radar Sensor Module has not been received.

OBDII Code U026D Cadillac - Lost Communication With Rear Middle Short Range Radar Sensor Module - AutoCodes.com — U026D Cadillac Code - Lost Communication With Rear Middle Short Range Radar Sensor Module

What does this mean?

What are the Possible Causes of the DTC U026D Cadillac?

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

How to Fix the DTC U026D 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 U026D 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.

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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 U026D Cadillac Code

1. What are the common symptoms of OBDII code U026D in a Cadillac related to the Rear Middle Short Range Radar Sensor Module?

- Common symptoms include loss of radar functionality for features like blind spot monitoring and rear cross-traffic alert.

2. What can cause the OBDII code U026D to trigger in a Cadillac?

- The code may be triggered by issues such as damaged wiring, a faulty radar sensor module, or a communication breakdown between the module and the vehicle's computer.

3. How can I diagnose the cause of the U026D trouble code in my Cadillac?

- Diagnosing this code may involve checking the wiring and connections to the radar sensor module, testing the module itself, and using a diagnostic scan tool to analyze communication errors.

4. Can I still drive my Cadillac with the U026D trouble code present?

- While it may be safe to drive, it's recommended to address the issue promptly to ensure the proper functioning of safety features relying on the radar sensor module.

5. What are some repair tips for fixing the U026D code in a Cadillac?

- Repair tips may include checking and repairing any damaged wiring, replacing the faulty radar sensor module, and clearing the trouble code with a diagnostic tool after the repair.

6. Is it possible to reset the U026D trouble code in a Cadillac without fixing the underlying issue?

- While you can clear the code temporarily, it will likely reappear until the root cause of the problem, such as a faulty radar sensor module, is addressed.

7. How much does it typically cost to repair the U026D trouble code in a Cadillac?

- Repair costs can vary depending on the specific issue causing the code, with factors like parts and labor contributing to the overall expense.

8. Can a DIY enthusiast fix the U026D trouble code in a Cadillac, or is it best left to professional mechanics?

- Some simple tasks like checking connections and wiring can be done by DIY enthusiasts, but diagnosing and replacing complex components may be best left to experienced mechanics.

9. Are there any recalls or technical service bulletins related to the U026D code in Cadillac vehicles?

- Checking with Cadillac dealerships or online resources for any recalls or technical service bulletins specific to this code can provide valuable information on potential known issues and solutions.

10. How important is it to address the U026D trouble code in a Cadillac promptly?

- Promptly addressing the code is crucial to ensure the proper functioning of safety features and systems relying on the radar sensor module, enhancing overall vehicle safety.