U1950 LINCOLN – UPB Communication Bus Fault

U1950 LINCOLN Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light),Engine won?????start ??won?????crank,ABS Warning Light ON,Transmission may shift erratically,Cluster won?????register any reading

U1950 LINCOLN Possible Causes

UBP Bus wiring intermittently open/shorted to power or ground,Faulty / intermittent electrical connection at any of the controllers on the UBP network

U1950 LINCOLN Description

The Anti-lock Brake System (ABS) module, the Powertrain Control Module (PCM), the Transmission Control Module (TCM), the instrument cluster and the parking aid module are just some of modules that communicate over the UART Based Protocol network bus or UBP 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 U1950 will set.