AutoCodes – Cadillac – U007B Cadillac

U007B Cadillac Code - Control Module Communication High Speed Extension CAN Bus Off

Quick Answer

The devices connected to the object high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Check for more codes, Faulty Control Module, Control Module harness is open or shorted. 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: U007B Cadillac indicates Control Module Communication High Speed Extension CAN Bus Off.
Common causes: Common causes include Check for more codes, Faulty Control Module, Control Module harness is open or shorted.
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 323

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 Jul 20, 2023

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 U007B Cadillac Description

The devices connected to the object 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 devices when the ignition switch is in any position other than OFF. The object high speed GMLAN serial data bus uses terminating resistors that are in parallel with the object high speed GMLAN (+) and (-) circuits. The Diagnostic Trouble Code (DTC) sets when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U007B Cadillac - Control Module Communication High Speed Extension CAN Bus Off - AutoCodes.com — U007B Cadillac Code - Control Module Communication High Speed Extension CAN Bus Off

What does this mean?

What are the Possible Causes of the DTC U007B Cadillac?

Check for more codes
Faulty Control Module
Control Module harness is open or shorted
Control Module circuit poor electrical connection

How to Fix the DTC U007B 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 U007B 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 U007B Cadillac code?

Need more information on how to fix the U007B Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U007B 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 U007B Cadillac Code

1. What does the OBDII code U007B mean on a Cadillac?

The U007B code indicates a communication issue on the high-speed CAN (Controller Area Network) bus, specifically related to the "Extension CAN Bus Off" condition.

2. What are common symptoms of the U007B code on a Cadillac?

Symptoms may include warning lights on the dashboard, intermittent electrical issues, failure of certain modules to operate, or a complete loss of communication between control modules.

3. What causes the U007B code on a Cadillac?

Common causes include damaged or corroded wiring, poor connections at CAN bus terminals, a failed control module, or electrical interference.

4. Can a weak battery cause the U007B code on a Cadillac?

Yes, a weak or failing battery can disrupt communication on the CAN bus system and trigger the U007B code.

5. How do you diagnose the U007B code on a Cadillac?

Diagnosis involves using a scan tool to check all related modules for communication errors, inspecting the wiring and connectors on the high-speed CAN bus, and testing the battery and voltage levels.

6. Can I drive my Cadillac with the U007B code?

Driving with the U007B code is not recommended as it may impact critical systems, such as stability control or engine performance, depending on the affected modules.

7. What are some repair tips for fixing the U007B code on a Cadillac?

Repairs may include cleaning or repairing corroded connectors, replacing damaged wiring, updating module software, or replacing a faulty control module.

8. How much does it cost to fix the U007B code on a Cadillac?

The cost can vary widely, ranging from $100 for basic wiring repairs to $1,000 or more if a control module needs replacement and reprogramming.

9. Can a software update fix the U007B code on a Cadillac?

In some cases, a software update for the affected control module may resolve communication issues and clear the U007B code.

10. Which modules are typically affected by the U007B code on a Cadillac?

The U007B code may affect various modules, including the Engine Control Module (ECM), Transmission Control Module (TCM), and Body Control Module (BCM), depending on the network's configuration.