U0155 Fault Code

Long Description

Fault code U0155 is a network communication code that is logged when the control module has detected a communication malfunction to the instrument panel control (IPC) module.

The instrument panel, which is also commonly known as the dashboard, is responsible for relaying information through a data bus from the various control modules of the vehicle to the driver.

This transfer of information is what changes the various dials on the dashboard, as well as turns on warning lights if necessary.

A malfunction like this can cause the driver to be completely unaware of how the vehicle is running or if there are any warning lights present.

Ford, Honda, Hyundai, Land Rover, and Mazda are some of the most commonly searched alongside this fault code. However, with the continuing rise in the complexity of onboard computers, this code can happen to any modern vehicle.

Other Signs of This Problem

There are several very noticeable symptoms that can present themselves when it comes to this type of fault code.

One of the most noticeable signs is the presence of the Check Engine light on the dashboard.

There will likely be multiple other warning lights illuminated on the dashboard as the IPC malfunctions. This can result in either all or none of the instrument lights on the IPC being illuminated.

These lights may also act erratically.

Be sure to look out for similar fault codes like U0156, U0157, and U0158. All of these indicate that there is lost communication to the various information centers throughout the vehicle.

What Could Be The Problem?

The cause for this type of issue will typically be a result of an electrical or electronic issue.

One of the most common causes of this issue is a faulty or dead battery as it can cause the electrical systems to malfunction.

A damaged instrument cluster is another likely cause. Within the instrument cluster circuit, electrical faults like damaged wires or loose connections can also be a problem.

Data bus issues can also be the cause of the breakdown in network communication.

Fixes

Fixing this type of issue will typically require extensive electrical work unless the fault can be pinpointed relatively quickly.

One of the first steps in fixing this fault code is to check the battery. The battery needs to be checked that it is not dead or operating under low voltage. If it is dead or faulty, it should be replaced.

The instrument cluster circuit needs to be checked for damaged wires or loose connections. These need to be repaired accordingly.

A defective instrument cluster needs to be replaced.

If it can be determined that the data bus is faulty, it should be replaced. Additionally, a faulty IPC needs to be replaced.

Seriousness

Fault code U0155 is a moderately serious issue. It can hide very important information from the driver in regard to how the vehicle is running. In some cases, it can also reduce the performance of the vehicle.

It is a good idea to have this fault code fixed as soon as possible to restore the operation of the instrument panel.