U1900 LINCOLN - CAN Communication Bus Fault
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
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).
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.
Engine Light ON (or Service Engine Soon Warning Light)
Amber ABS (Anti-lock Brakes) Light ON
Wrench Light On
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.