DTC U0158: Loss of Communication with Head Up Display

Introduction

The DTC U0158 error code represents a communication problem between the control unit and the Head Up Display (HUD) of a vehicle. This error can occur in several car models and, if not addressed quickly, could lead to more serious malfunctions. , affecting the safety and performance of the vehicle. In this article, we will explore the symptoms, causes, diagnosis and possible solutions to address this problem.

Symptoms

When DTC U0158 error occurs, you may notice some of the following symptoms:

  • Head Up display malfunction, with information not being displayed correctly.
  • HUD display suddenly turns off.
  • Dashboard error messages indicating communication problems.
  • Interruptions in the operation of other electronic functions related to the infotainment system or the dashboard.

Cause

Causes of DTC code U0158 can vary, but the most common include:

  • Damaged or disconnected cables :
    The cables connecting the control unit to the HUD display can be damaged, worn or disconnected due to vibrations or accidents.

  • Faulty control unit :
    The control unit, responsible for managing communication with the HUD display, may be faulty.

  • HUD display malfunction :
    The display itself may have internal faults, thus compromising communication.

  • Interference in the CAN network system :
    Communication problems within the CAN (Controller Area Network) network can affect the operation of the display.

  • Software issues :
    The control unit may require a software update to resolve bugs or malfunctions.

Diagnosis

Diagnosing DTC U0158 requires the use of diagnostic scan tools. Here are the basic steps to follow:

  1. Connect the OBD-II scanner :
    Use an OBD-II scanner to read fault codes present in the ECU.

  2. Check related codes :
    Check for other related DTC codes, such as U0140 (Lost Communication with Control Unit) or U0200 (Lost Communication with Input Module).

  3. Check cables and connectors :
    Visually inspect the HUD system cables and connectors for any signs of damage or disconnections.

  4. Test the control unit :
    If the cables are intact, perform a control unit test to see if it is working properly.

  5. Check the HUD display :
    If the control unit is functional, check the functionality of the HUD display itself.

  6. Run a communication test :
    Use advanced tools to monitor communication in the CAN system and identify any problems.

Resolution and repair

Once the problem is diagnosed, you can proceed with the resolution. The following solutions can be adopted:

  • Cable Repair :
    If any damaged cables are found, repair or replace them to restore communication.

  • Replacing the control unit :
    In case of control unit failure, proceed with the replacement of the component.

  • Replacing the HUD display :
    If the display is faulty, it needs to be replaced with a new one.

  • Software Update :
    If the problem is software related, perform a control unit update to resolve any bugs.

  • ECU Reset :
    After making repairs, perform an ECU reset to clear any stored fault codes.

Insight: Components involved in the failure

Cables and connectors

Cables and connectors are essential to ensure reliable communication between the various components of the vehicle. If they are worn or damaged, the entire system can be compromised. It is important to use high-quality cables and ensure that the connectors are well secured and free from corrosion.

Control unit

The control unit, or ECU, is the brain of the vehicle. It manages communication between the various systems and components. Its integrity is crucial for the correct functioning of functions such as the HUD display. A malfunction of the ECU can have repercussions on multiple systems at the same time.

Head-up display

The HUD display is a component that provides information to the driver in a direct and visible way without taking their eyes off the road. Its correct functionality is essential for safety and driving comfort. Any malfunctions can lead to distractions and compromise the safety of the vehicle .

Conclusions

Addressing the DTC U0158 trouble code requires accurate diagnosis and a thorough understanding of the systems involved. Symptoms may vary, but the key to effective resolution is identifying the root cause of the malfunction. By following the diagnosis and resolution steps, auto repairers can restore the functionality of the Head Up Display and ensure the safety and comfort of the driver. Preventive maintenance and thorough knowledge of the vehicle's electronic systems can help reduce the frequency of these problems in the future.

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.