AutoCodes – Lincoln – U1900 Lincoln

U1900 Lincoln Code - CAN Communication Bus Fault

Quick Answer

The Anti-ock Brakes System (ABS) module, the Powertrain Control Module (PCM), and the instrument cluster communicate over the Controller Area Network (CAN) Bus. Common causes include Faulty / intermittent ignition switch connections, CAN Bus wiring intermittently open/shorted to power or ground, Faulty / intermittent connection at PCM. 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 Lincoln indicates CAN Communication Bus Fault.
Common causes: Common causes include Faulty / intermittent ignition switch connections, CAN Bus wiring intermittently open/shorted to power or ground, Faulty / intermittent connection at PCM.
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 7,737

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 Jun 09, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U1900 Lincoln Description

The Anti-ock Brakes System (ABS) module, the Powertrain Control Module (PCM), and the instrument cluster communicate over the Controller Area Network (CAN) Bus. This is a high-speed bus communication system and is not fault tolerant, which means any type of intermittent/loose connection between these 3 controllers will cause communication to stop. When the PCM, ABS module and instrument cluster are unable to communicate with each other at any time while the ignition switch is turned on, code U1900 will set.

OBDII Code U1900 Lincoln - CAN Communication Bus Fault - AutoCodes.com — U1900 Lincoln Code - CAN Communication Bus Fault

What does this mean?

What are the Possible Causes of the DTC U1900 Lincoln?

Faulty / intermittent ignition switch connections
CAN Bus wiring intermittently open/shorted to power or ground
Faulty / intermittent connection at PCM
Faulty electrical connections at ABS Control Module
Faulty electrical connections at the instrument cluster
Poor connections at the trailer brake controller/trailer connector

How to Fix the DTC U1900 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 does this mean?

Code Tech Notes

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).

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1900 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 U1900 Lincoln code?

Need more information on how to fix the U1900 Lincoln code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1900 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 U1900 Lincoln Code

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

The common symptoms include intermittent or complete loss of communication with various vehicle systems, warning lights on the dashboard, and erratic behavior of electronic components.

2. What are the usual causes of U1900 Lincoln CAN Communication Bus Fault?

The code U1900 is typically caused by issues with the Controller Area Network (CAN) communication bus, such as wiring harness faults, loose connections, or a defective module.

3. How can I diagnose the U1900 code in a Lincoln vehicle?

Diagnosing the U1900 code involves using a professional OBDII scanner to identify the specific module or network segment causing the communication fault. A thorough inspection of the wiring and connectors is also necessary.

4. Can a DIY enthusiast repair the U1900 code in a Lincoln vehicle?

Repairing the U1900 code may require advanced diagnostic tools and technical expertise. While basic checks like inspecting connections can be done by DIY enthusiasts, complex issues may need the assistance of a professional mechanic.

5. Are there any quick tips for resolving the U1900 code in a Lincoln vehicle?

Quick tips include checking and securing all wiring harness connections, ensuring proper grounding, and performing a module reset if recommended by the vehicle manufacturer.

6. Is it safe to continue driving with the U1900 code present in a Lincoln vehicle?

It is not recommended to drive with the U1900 code active, as it can lead to further communication failures with critical vehicle systems, potentially affecting safety and performance.

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

The cost of repairing the U1900 code can vary depending on the underlying issue and the labor rates of the repair shop. It is advisable to obtain multiple quotes from reputable mechanics.

8. Can extreme weather conditions cause the U1900 code to trigger in a Lincoln vehicle?

Extreme weather conditions, such as temperature fluctuations or moisture exposure, can potentially affect the CAN communication bus and lead to the U1900 code being triggered.

9. Will disconnecting the battery reset the U1900 code in a Lincoln vehicle?

Disconnecting the battery may temporarily clear the code, but if the underlying issue causing the CAN communication fault is not addressed, the code is likely to reappear.

10. How can I prevent the U1900 code from recurring in my Lincoln vehicle?

Regular maintenance, timely repairs of wiring issues, and keeping all modules updated can help prevent the U1900 code from recurring in a Lincoln vehicle.