U0158

Universal

Lost Communication With Head Up Display

Definition source: General OBD-II reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
Medium Severity

The head-up display (HUD) presents selected vehicle information in the driver’s line of sight and communicates with other vehicle modules over the vehicle network. U0158 indicates that a module detected a loss of communication with the HUD. The display may be blank or unavailable, but this code alone does not prove the HUD itself has failed.

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⚠️ Before You Begin (Safety First)

If the HUD is unavailable, use the instrument cluster for vehicle information and avoid trying to troubleshoot or adjust the display while driving. Stop in a safe place if important information is unavailable on the instrument cluster too, or if other warnings suggest a broader electrical or network problem.

Common Symptoms

  • The HUD may be blank or fail to turn on if it cannot communicate with the vehicle.
  • Some information normally shown on the HUD may be missing or incomplete.
  • The display may work intermittently if a connection or network communication is intermittent.
  • There may be no obvious symptom if the HUD is not fitted, is not in use, or the communication loss is temporary.

Common Causes

  • A loose, damaged, or corroded HUD electrical connector may interrupt power, ground, or network communication.
  • Damage or a fault in vehicle network wiring may prevent messages from reaching the HUD.
  • A power-supply or ground problem may keep the HUD from operating or communicating.
  • A fault in the HUD module may prevent it from responding on the network; the code alone does not confirm this.
  • Another network or electrical-system problem, including an issue affecting more than one module, may cause communication loss.
  • Recently installed equipment or disturbed wiring may interfere with module connections or network communication.

Diagnostic Steps

  1. Confirm that the vehicle is equipped with a HUD and check whether its display is enabled using the owner’s manual; this helps distinguish a disabled display from a communication problem.
  2. With the vehicle parked safely, note whether the HUD is blank, intermittent, or displaying only some information, and check whether the instrument cluster continues to show essential information.
  3. Check the owner’s manual for HUD-related fuses and inspect them only if they are accessible and safe to check; replace a fuse only with the specified type and rating, and do not keep replacing one that blows.
  4. Look for visible signs of recent wiring disturbance, moisture, or damage around accessible areas, but do not remove dash trim or probe wiring near airbag components.
  5. If a suitable scan tool is available, check for related codes in other modules and record them before clearing anything; a broader pattern can point to a network or power issue rather than an isolated HUD fault.
  6. Have a qualified technician test module power, ground, connectors, and network communication if the code returns or the display remains unavailable.

When to Call a Professional

A technician can scan all modules to see which ones report the communication loss and whether other network codes are present. They can then check HUD power and ground, connectors, and network wiring, and confirm whether the HUD module is communicating before recommending replacement. Exact tests and procedures depend on the model, year, and engine.

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Commonly Asked Questions

Does U0158 prove that the head-up display needs replacement?

No. It identifies lost communication with the HUD, which can also result from a power, ground, connector, wiring, or broader network problem. Diagnosis is needed before replacing a part.

Can I drive with the HUD unavailable?

Often the vehicle can still be driven if the instrument cluster and other essential displays work normally. Use those displays instead, and stop safely if essential information is unavailable or other warnings indicate a wider problem.

Why might there be no noticeable symptoms?

The fault may be intermittent, the HUD may not be in use, or the vehicle may provide the same information through the instrument cluster. A stored communication code can exist without an obvious driver complaint.

What is the difference between a HUD fault and a network fault?

A HUD fault affects the display module or its connections, while a network fault can prevent several modules from communicating. Codes from multiple modules and electrical testing help distinguish these possibilities.

Can I check the wiring behind the dashboard myself?

Avoid removing trim or probing wiring near airbag components. Accessible visual checks are reasonable, but dashboard-area wiring and network tests should be handled using vehicle-specific service information by a qualified technician.

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