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Home / DTC / U0158 — Lost Communication With Head Up Display

U0158 — Lost Communication With Head Up Display

Detailed page for trouble code U0158.

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Code

U0158

Generic U — Network/User

Lost Communication With Head Up Display

Brand: Generic
Type: U — Network/User
Views: UK: 22 EN: 37 RU: 17
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty HUD module
  • Open or shorted CAN bus wiring (CAN High / CAN Low) to or from the HUD
  • Poor power or ground at the HUD (blown fuse, bad connector, corrosion)
  • Failed network termination or incorrect bus termination
  • Intermittent connector or wiring damage (broken strand, corrosion)
  • Module not configured/programmed correctly after replacement or software fault

Symptoms

  • No HUD projection or blank screen
  • HUD intermittent operation or flicker
  • Instrument cluster or message center displays communication warning
  • Related systems that use HUD data may show degraded behavior
  • DTC U0158 stored, possible multiple network U-codes

What to check

  • Read all stored DTCs and freeze frame data with a capable scan tool; note other U-codes
  • Check battery voltage (key on) and charging system status
  • Inspect HUD power and ground fuses and fusible links
  • Visually inspect HUD connector and wiring for corrosion, damage, or looseness
  • Use scan tool to verify whether the HUD module appears on the vehicle network/node list
  • Measure CAN bus voltages (CANH/CANL) at the HUD connector with key ON

Signal parameters

  • CAN bus idle (recessive): CANH ≈ 2.5 V, CANL ≈ 2.5 V (common-mode)
  • CAN bus dominant: CANH ≈ 3.5 V, CANL ≈ 1.5 V (differential ≈ 2.0 V)
  • Typical DC supply to HUD (key ON): approx. vehicle battery voltage ≈ 12–14.5 V
  • Module ground continuity: low resistance to chassis, typically
  • Termination resistance between CANH and CANL with network connected: ≈ 60 Ω (two 120 Ω resistors in parallel)
  • Network data rate: vehicle- and module-specific (commonly 500 kb/s or 250 kb/s); check OEM spec

Diagnostic algorithm

  1. Record all DTCs and freeze frame data. Note other U-codes or module absence.
  2. Verify battery voltage and charging system. Low battery can prevent module wakeup.
  3. Inspect HUD power, ground, and related fuses. Repair any power/ground faults before communication testing.
  4. With ignition ON, check for HUD presence using a scan tool node list or module query. If the HUD does not appear, proceed to wiring checks.
  5. Visually inspect HUD connectors and harness routing; repair any damage or corrosion.
  6. Measure CANH and CANL voltages at the HUD connector with key ON and engine OFF. Compare to expected idle voltages.
  7. Measure resistance across CANH and CANL (approx. 60 Ω). If open or high, locate open or missing termination.
  8. Check for shorts to battery or ground on each CAN wire (isolate harness sections if necessary).
  9. Wiggle test wiring and connector while monitoring bus traffic; use oscilloscope to look for noise, missing recessive/dominant transitions, or errant voltages.
  10. If wiring and termination are good, attempt software wake/reflash or reinitialize module per OEM procedure. If replacement is required, program/configure the new HUD module as specified.
  11. After repairs, clear codes and road/test to confirm communication is restored and DTC does not return.

Likely causes

  • Corroded/loose HUD power or ground connector
  • Open or high-resistance CAN High or CAN Low between HUD and network
  • Blown HUD-related fuse or fusible link
  • Failed HUD internal electronics
  • Missing or incorrect termination (failed resistor, harness cut)
  • Intermittent wiring fault at harness routing points (doors, dash)

Fault status

⚠️ Status
Lost Communication With Head Up Display — no responses or messages received from HUD on vehicle network.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

Similar codes

U0100 U0140 U0155 U0121 U0073
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