Code U0155 is one of many trouble codes that can be logged and retrieved from the OBD system. Here is some helpful information that can help you understand what getting this code may mean for your vehicle.
Diagnostic trouble code (DTC) U0155 stands for “Lost Communication with Instrument Panel Control (IPC) Module.” This code is logged when one or more modules (computers) on the vehicle have lost communication with the Instrument Panel Control (IPC) module.
The instrument cluster communicates with other modules on the vehicle over a data bus. All of a vehicle’s computers share and receive information over the bus.
Without the data bus, control modules cannot exchange information, and the scan tool may not be able to get information from the vehicle, depending on which circuit is affected. Code U0155 logs when the instrument cluster does not receive or transmit messages on the bus.
Depending on the severity of the problem, related error codes might also be stored with this DTC. Code U0155 is very similar to error codes U0100 and U0300.
U series codes like this one relate to the network. P series codes are powertrain (Engine/Transmission) related, and C series codes are chassis related (brakes, suspension, etc.).
A network bus is an “information highway” that provides constant communication between vehicle modules, and each module only uses the information it needs from the bus.
Every modern vehicle has at least two network buses that communicate at different speeds, and various automakers describe their lower speed buses using different abbreviations. For just a few examples of the slower network bus designations, GM calls its older bus a Class 2 line. Ford has an SCP bus. Chrysler has CCD and PCI buses. Some of the older buses have just one wire carrying the information, but most buses require two wires.
Different network bus lines communicate at different speeds and with different protocols, and some platforms will have a module (sometimes called a “gateway” module) that decodes and exchanges data from modules on different bus lines, depending on necessity and application.
When one or more modules stops talking on any of the networks, a U series code is stored. That’s what U0155 and similar codes are about. A module can be shorted, inoperative, babbling, damaged, or there may be wiring issues. There can be many reasons the module can stop communicating.
Note: The definition of code U0155 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.
Different makes and models can set the error code U0155. But this does not mean that there is a one-size-fits-all approach to diagnosing its underlying cause. The steps for troubleshooting this code will vary depending on your specific vehicle.
Check out the video below to get an idea of what the diagnostic process for this code might involve:
Code U0155 shares similar triggers and symptoms with other trouble codes. However, the appropriate diagnostic and repair procedure will depend on the specifications of your vehicle. If you’re unfamiliar with auto repair, it’s best to leave the job to a mechanic.
If you’re considering troubleshooting this code on your own, it’s a good idea to refresh your automotive knowledge before attempting any fixes. Always consult a vehicle-specific repair manual or an online repair database to learn the appropriate diagnostic procedures for this code.
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