DTC U0191: Lost communication with the television

Introduction

The DTC U0191 error code represents a communication problem within the vehicle's control network, especially with the television or infotainment module. This article aims to provide a detailed analysis of the symptoms, causes, and diagnosis and resolution procedures to facilitate the work of auto repairers. Understanding and addressing this type of error is essential to ensure the proper functioning of infotainment systems and to maintain customer satisfaction.

Symptoms

When error code U0191 occurs, the following symptoms may occur:

  • Malfunction of the television or infotainment system.
  • Black or error screens on the display.
  • Unable to access multimedia functions.
  • Error messages displayed on the dashboard.
  • Interruption of communication between other electronic modules.

These symptoms not only degrade the user experience, but can also indicate broader issues with the vehicle's communication network.

Cause

Causes of error code U0191 can vary and include:

  • CAN network interruption :
    The infotainment system communicates with other modules via the Controller Area Network (CAN). Problems in this network can cause loss of communication.

  • Infotainment system control unit malfunction :
    If the ECU or engine control unit that manages the infotainment system is damaged or malfunctioning, it can lead to this error.

  • Wiring problems :
    Damaged wires, oxidized connectors, or short circuits can interrupt communication between modules.

  • Software issues :
    Incomplete or poorly executed software updates can cause incompatibilities between modules.

  • Other related DTC codes :
    It is important to consider other fault codes that may appear in conjunction, such as U0100 (Lost Communication with ECU), which may provide further clues to the source of the problem.

Diagnosis

Diagnosing the U0191 error code requires a systematic approach. Here are the suggested steps:

  1. Vehicle Scan :
    Use an OBD-II scanner to read stored trouble codes. Write down all codes, especially related ones.

  2. Visual inspection :
    Check the wiring and connectors associated with the infotainment system control unit for signs of wear, damage or oxidation.

  3. CAN network check :
    Use an oscilloscope or network analyzer to ensure that the signals on the CAN network are present and stable.

  4. Control unit test :
    If necessary, test the infotainment system control unit to see if it responds correctly to commands.

  5. Software control :
    Make sure your infotainment system software is up to date and compatible with other modules in your vehicle.

Resolution and repair

Resolving the U0191 error code may require several procedures depending on the identified cause. Here are some common strategies:

  • Repair or replacement of damaged cables :
    If you find any damage to cables or connectors, make any necessary repairs to restore network continuity.

  • Replacing the control unit :
    If the infotainment system control unit is found to be faulty, replacing it with a working unit may solve the problem.

  • Software Update :
    Perform necessary software updates to ensure compatibility between modules.

  • Resetting the control unit :
    In some cases, a reset of the control unit may resolve the communication problem.

  • Checking for correct configuration :
    Make sure all configuration settings are correct and match your vehicle specifications.

Insight into the components involved

Mechanical and electrical components involved

In the context of DTC U0191, several components may be involved in the communication issue. These include:

  • Infotainment system control unit :
    This unit handles all multimedia functions and must communicate with other ECUs to provide a smooth user experience.

  • CAN network :
    It is essential for communication between the various vehicle modules, allowing the exchange of information in real time.

  • Associated sensors and actuators :
    Some modules may depend on information from sensors or actuators, and if these do not work properly, it may affect communication.

  • Connectors and wiring :
    The quality of connectors and wiring is crucial. Oxidation or loose contact can interrupt communication.

Conclusions

The DTC U0191 error code may seem complex, but with an accurate diagnosis and a systematic approach, it is possible to solve the communication problem with the infotainment system. It is essential not to overlook the related error signals and to consider every aspect of the communication network. In a car repair context, good communication with the customer and proper management of expectations can make the difference in final satisfaction. With the right skills and tools, every auto repairer can successfully deal with this type of error.

Important
Not all OBD2 codes used by one manufacturer are used by other brands, and may not have the same meaning.
The information presented here is for informational purposes only. We are not responsible for any actions you take on your vehicle. If you have any concerns about repairing your vehicle, please contact your repair shop.