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U1900 Ford Code - CAN Communication Bus Fault

Quick Answer

The U1900 Ford diagnostic trouble code indicates a fault in the Controller Area Network (CAN) communication bus system. Common causes include Faulty CAN bus wiring or connections, Defective CAN bus module, Corrosion or damage to the CAN bus terminals. 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
U1900 Ford indicates CAN Communication Bus Fault.
Common causes
Common causes include Faulty CAN bus wiring or connections, Defective CAN bus module, Corrosion or damage to the CAN bus terminals.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 18, 2024
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Code U1900 Ford Description

The U1900 Ford diagnostic trouble code indicates a fault in the Controller Area Network (CAN) communication bus system. The CAN bus is a network that allows various modules in the vehicle to communicate with each other. When this code is triggered, it means that there is a disruption or failure in the communication between these modules. This can lead to issues with different systems in the vehicle, such as the engine, transmission, anti-lock brakes, airbags, and more. It can cause malfunctions in various components and may result in poor vehicle performance, safety concerns, and overall reliability issues. If left unaddressed, the U1900 code can lead to further damage to the vehicle's systems and potentially result in more serious and costly repairs down the line.

OBDII Code U1900 Ford - CAN Communication Bus Fault
U1900 Ford Code - CAN Communication Bus Fault

Common Causes of U1900 Ford

  1. Faulty CAN bus wiring or connections.
  2. Defective CAN bus module.
  3. Corrosion or damage to the CAN bus terminals.
  4. Electrical interference from aftermarket accessories.
  5. Software issues in the vehicle's modules.

Symptoms of U1900 Ford

  1. Check engine light is illuminated on the dashboard.
  2. Loss of communication with certain modules in the vehicle.
  3. Issues with power windows, door locks, or other electrical components.
  4. Transmission shifting problems.
  5. Inability to start the vehicle.

How to Fix U1900 Ford

  1. Perform a thorough inspection of the CAN bus wiring and connections to check for any damage or loose connections.
  2. Test the CAN bus module to determine if it is functioning correctly and replace it if necessary.
  3. Clean and repair any corrosion or damage to the CAN bus terminals.
  4. Remove any aftermarket accessories that may be causing electrical interference.
  5. Update the software in the vehicle's modules to ensure compatibility and proper communication.

Cost to Fix U1900 Ford

The typical repair costs for addressing a U1900 Ford code can range from $200 to $500, including parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Rates can range from $80 to $150 per hour, with higher rates in metropolitan areas or at dealerships, and lower rates at independent shops. To get a more accurate estimate, it's recommended to check with local auto repair shops.

What does this mean?

Tech Notes for U1900 Ford

This is typically a false/intermittent code. It can occur if:
Someone hooks up a scanner to the OBDII port while the ignition is on or while the engine is idling.
A trailer brake system is installed improperly/incorrectly on a truck with ABS (anti-lock brakes).





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When is the Code Detected?

When the PCM, Brake Controller and Instrument Cluster are unable to communicate with each other at any time while the ignition switch is turned to the “Run” position, code U1900 sets in memory.

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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 U1900 Ford Code

1. What are the common symptoms of OBDII code U1900 Ford (CAN Communication Bus Fault)?

- Common symptoms include intermittent or complete loss of communication with various vehicle control modules, warning lights on the dashboard, and issues with power windows or other electronic components.

2. What are the possible causes of the U1900 code in a Ford vehicle?

- The U1900 code can be caused by issues such as faulty wiring or connectors in the CAN bus system, a malfunctioning control module, water damage, or a weak battery.

3. How serious is the U1900 CAN Communication Bus Fault code in a Ford vehicle?

- The U1900 code should be addressed promptly as it can affect the proper functioning of various vehicle systems controlled by the CAN bus network.

4. How can I diagnose the U1900 code in my Ford vehicle?

- Diagnosing the U1900 code typically involves using a diagnostic scanner to read the code and identify which specific control module is experiencing communication issues.

5. What are some repair tips for fixing the U1900 code in a Ford vehicle?

- Repair tips include checking and repairing any damaged wiring or connectors in the CAN bus system, ensuring all modules are properly connected and functioning, and performing a battery voltage test.

6. Can I drive my Ford vehicle with the U1900 code present?

- It is not recommended to drive your vehicle with the U1900 code present as it can lead to potential safety hazards and further damage to electronic components.

7. How much does it cost to repair the U1900 code in a Ford vehicle?

- The cost of repairing the U1900 code can vary depending on the exact cause of the issue, but it is advisable to consult with a professional mechanic for an accurate estimate.

8. Can the U1900 code be triggered by a loose gas cap in a Ford vehicle?

- The U1900 code is typically not related to a loose gas cap as it specifically indicates a CAN communication bus fault within the vehicle's network.

9. Is it possible to reset the U1900 code in a Ford vehicle by disconnecting the battery?

- Disconnecting the battery may temporarily clear the code, but it is important to address the underlying issue causing the U1900 code to prevent it from reoccurring.

10. How long does it take to repair the U1900 code in a Ford vehicle?

- The repair time for the U1900 code can vary depending on the complexity of the issue, availability of parts, and the expertise of the mechanic, but it may take a few hours to a day to diagnose and fix the problem.

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