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U1900 Lincoln Code - CAN Communication Bus Fault

- Code Popularity: 5,537 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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By - Updated Jun 09, 2020
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|Code U1900 Lincoln Possible Causes

  • 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 do I Fix the Code U1900 Lincoln?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Does your Lincoln have Safety Recalls? → Check here

|Code U1900 Lincoln 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 U1900 Lincoln?

Labor: 1.0

The cost of diagnosing the U1900 Lincoln code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

|When is the Code U1900 Lincoln 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.

|What are Code U1900 Lincoln Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Amber ABS (Anti-lock Brakes) Light ON
  • Wrench Light On

|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 -
U1900 Lincoln Code - CAN Communication Bus Fault

|Need More Information on 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 U1900 Lincoln Code?

Get the U1900 Lincoln code diagnosed by a professional: Find a repair shop in your area

|Code U1900 Lincoln comments

Help us improve Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the U1900 Lincoln code? Have you replaced any parts?
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