AutoCodes – Cadillac – U007C Cadillac

U007C Cadillac Code - Control Module Communication High Speed Extension CAN Bus 2 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: U007C Cadillac indicates Control Module Communication High Speed Extension CAN Bus 2 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.

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Code Popularity 488

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jul 20, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U007C 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 U007C Cadillac - Control Module Communication High Speed Extension CAN Bus 2 Off - AutoCodes.com — U007C Cadillac Code - Control Module Communication High Speed Extension CAN Bus 2 Off

What does this mean?

What are the Possible Causes of the DTC U007C 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 U007C 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 U007C 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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Need more information on how to fix the U007C Cadillac code? Get Access to Factory Service Manuals

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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 U007C Cadillac Code

1. What does the OBDII code U007C mean on a Cadillac?

The U007C code indicates a communication issue on the high-speed CAN Bus 2 network, where one or more control modules are unable to communicate properly.

2. What are the common symptoms of the U007C code in a Cadillac?

Symptoms may include warning lights on the dashboard (e.g., Check Engine or ABS), erratic vehicle behavior, loss of certain functions like traction control, or the vehicle failing to start.

3. What causes the U007C code to appear in a Cadillac?

Common causes include damaged wiring or connectors in the CAN Bus 2 circuit, a faulty control module, a dead or weak battery, or electrical interference.

4. Can a weak battery trigger the U007C code on a Cadillac?

Yes, a weak or failing battery can cause communication errors in the CAN Bus system, including triggering the U007C code.

5. How do I diagnose the U007C code on a Cadillac?

Start by visually inspecting the CAN Bus 2 wiring and connectors for damage or corrosion, check the battery voltage, and use a scan tool to identify which module isnâ€™t communicating.

6. Can I drive my Cadillac with the U007C code?

While the vehicle may still be drivable, itâ€™s not recommended as the issue could affect critical systems like braking or stability control, potentially compromising safety.

7. What repairs can fix the U007C code on a Cadillac?

Repairs may include replacing damaged wiring, cleaning or reconnecting corroded connectors, reprogramming or replacing a faulty control module, or resolving any battery or power issues.

8. How much does it cost to fix the U007C code on a Cadillac?

The repair cost can range from $100 to $1,000 or more, depending on whether itâ€™s a simple wiring repair or a costly control module replacement.

9. Can a DIYer fix the U007C code on a Cadillac?

If the issue is minor, like a loose connector or damaged wire, a DIYer with basic tools and knowledge can attempt repairs. However, diagnosing and fixing control module issues may require professional expertise.

10. Does the U007C code require reprogramming a control module?

In some cases, yes. If a control module is determined to be faulty or has lost its programming, it may need to be replaced and reprogrammed by a qualified technician.