U0214 Lost Communication With Remote Function Actuation KVM
his is a generic communication system diagnostic trouble code that applies to most OBD-II vehicle makes and models. This code means that the Remote Function Actuation (RFA) and other control modules on the vehicle are not communicating with each other. The circuit most often used to communicate with is known as Controller Area Network bus communications, or simply put, CAN bus.The modules communicate with each other over a network, much like the network you have at home or at work. There are several network systems used by the vehicle manufacturers. Prior to 2004, the more common (not all inclusive) module-to-module communication systems were Serial Communications Interface or SCI; SAE J1850 or PCI bus; and Chrysler Collision Detection, or CCD. The most common system used after 2004 is known as Controller Area Network bus communications, or simply put, CAN bus (was also used before 2004 on a small segment of vehicles). Without this CAN bus, control modules cannot exchange information, and your scan tool may or may not be able to get information from the vehicle, depending on which circuit is affected. The Remote Function Actuation (RFA) is typically located behind the dash, on either side of the vehicle. May also be mounted inside the center console or even the main power distribution center. It receives inputs from a variety of sensors, some hardwired directly to it, while most are sent over the bus communications system from the Powertrain Control Module (PCM). These inputs allow the module to control the actuation of any remotely operated device on the vehicle not currently controlled by another system. This gives the manufacturer the capability to diagnose and troubleshoot these often overlooked / add on systems.
Severity in this case may or may not be severe, depending upon what device is being monitored. The manufacturer may have provided a manual workaround in the event of a complete electric / manual failure. Vehicle operation may or may not be affected by the lack of operation of the RFA.
Typically the causes for this code to set are: Open in the CAN bus + or - circuit Short to power or ground in either CAN bus circuit No power or ground to RFA module Rarely - faulty control module
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