AutoCodes – Lincoln – U0009 Lincoln

U0009 Lincoln Code - High Speed CAN Communication Bus (-) Shorted To Bus (+)

Quick Answer

Multiplexing is a method of sending 2 or more signals simultaneously over a single circuit. Common causes include Diagnosis of this Diagnostic Trouble Code (DTC) is accomplished via the vehicle symptom(s), Check for more codes, Faulty Control Module. 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: U0009 Lincoln indicates High Speed CAN Communication Bus (-) Shorted To Bus (+).
Common causes: Common causes include Diagnosis of this Diagnostic Trouble Code (DTC) is accomplished via the vehicle symptom(s), Check for more codes, Faulty Control Module.
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 1,128

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 Mar 29, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0009 Lincoln Description

Multiplexing is a method of sending 2 or more signals simultaneously over a single circuit. Multiplexing allows 2 or more electronic modules (nodes) to communicate over a twisted wire pair [data (+) and data (-)] network. The information or messages that can be communicated on these wires consists of commands, status or data. Multiplexing reduces the weight of the vehicle by reducing the number of redundant components and electrical wiring. The vehicle has 4 module communication networks connected to the DLC, located under the instrument panel. The communication networks are: HEV High Speed Controller Area Network (HS-CAN), High Speed Controller Area Network (HS-CAN), Medium Speed Controller Area Network (MS-CAN) and Infotainment Controller Area Network (I-CAN). The Diagnostic Trouble Code (DTC) U0009 sets when a High Speed Controller Area Network (HS-CAN) fault was present at a point in time. The fault is not currently present since the module is communicating with the scan tool.

OBDII Code U0009 Lincoln - High Speed CAN Communication Bus (-) Shorted To Bus (+) - AutoCodes.com — U0009 Lincoln Code - High Speed CAN Communication Bus (-) Shorted To Bus (+)

What does this mean?

What are the Possible Causes of the DTC U0009 Lincoln?

Diagnosis of this Diagnostic Trouble Code (DTC) is accomplished via the vehicle symptom(s)
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 U0009 Lincoln?

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 U0009 Lincoln 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 U0009 Lincoln code?

Need more information on how to fix the U0009 Lincoln code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0009 Lincoln 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 U0009 Lincoln Code

1. What are the common symptoms of OBDII code U0009 in a Lincoln vehicle?

- Common symptoms include issues with the vehicle's communication system, such as difficulty starting the car, intermittent electrical problems, and warning lights on the dashboard related to the communication bus.

2. What does the OBDII code U0009 in a Lincoln indicate?

- The code U0009 indicates that the High Speed CAN Communication Bus (-) is shorted to the Bus (+) in the Lincoln vehicle.

3. What are the possible causes of the U0009 code in a Lincoln?

- The code U0009 can be triggered by various factors, including wiring issues, damaged connectors, faulty control modules, or a short circuit in the communication bus system.

4. How can I diagnose the High Speed CAN Communication Bus issue in my Lincoln?

- Diagnosis typically involves inspecting the wiring harness, connectors, and control modules associated with the CAN bus system using a diagnostic scanner or multimeter to pinpoint the source of the short circuit.

5. Is it safe to drive my Lincoln with the U0009 code present?

- It is not recommended to drive the vehicle with the U0009 code active, as it can lead to further electrical problems and potential safety hazards. It is best to address the issue promptly.

6. Can I repair the U0009 code in my Lincoln myself, or do I need professional help?

- Repairing the U0009 code may require advanced diagnostic tools and expertise in automotive electrical systems. It is advisable to seek professional help to accurately diagnose and fix the problem.

7. Are there any common mistakes to avoid when dealing with the U0009 code in a Lincoln?

- One common mistake to avoid is overlooking basic checks like inspecting the wiring harness and connectors first before replacing more expensive components like control modules.

8. What are some tips for preventing the U0009 code from reoccurring in my Lincoln?

- To prevent the U0009 code from reoccurring, ensure proper installation of components, avoid water damage to electrical connections, and routinely inspect the CAN bus system for any signs of wear or damage.

9. How much does it typically cost to repair the U0009 code in a Lincoln at a dealership or repair shop?

- The cost of repairing the U0009 code in a Lincoln can vary depending on the extent of the damage and the specific components that need to be replaced. It is recommended to obtain quotes from different service providers.

10. Is the U0009 code a common issue in Lincoln vehicles, and are there any recalls related to this problem?

- The U0009 code may not be a common issue in Lincoln vehicles, but it is essential to stay updated on any manufacturer recalls or technical service bulletins related to communication bus problems to address them promptly.