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Home / DTC / U023C — Lost Communication With Image Processing Module “C”

U023C — Lost Communication With Image Processing Module “C”

Detailed page for trouble code U023C.

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Code

U023C

HYUNDAI U — Network/User

Lost Communication With Image Processing Module “C”

Brand: HYUNDAI
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse or loss of power to the image processing module
  • Poor ground connection at the module
  • Open, shorted, or corroded CAN/LIN/ethernet/video wiring or connectors
  • Faulty image processing module (internal failure)
  • Module not configured, incompatible software, or failed reflash
  • Intermittent connection from recent body or bumper repairs

Symptoms

  • Warning message or red/amber camera/ADAS indicator on the instrument cluster
  • Forward camera view missing or blank in infotainment/driver display
  • Lane keep assist, adaptive cruise, automatic emergency braking, or other ADAS features disabled
  • Related DTCs for camera, radar or other modules present
  • Intermittent loss of ADAS functions or message that camera/module is unavailable

What to check

  • Read all current and stored DTCs and freeze frame data with manufacturer scan tool (GDS or equivalent)
  • Check battery voltage and vehicle electrical system health (low voltage can cause communications loss)
  • Inspect fuses/relays for the image processing module and replace if blown
  • Visually inspect module connectors and wiring for corrosion, pin damage, water intrusion, or physical damage
  • Verify the module is present and recognized on the vehicle network with a scan tool
  • Measure CAN High/Low or other bus voltages at the module connector with key ON, engine OFF

Signal parameters

  • CAN bus idle voltages: CAN High ≈ 2.5 V, CAN Low ≈ 2.5 V (dominant state: CAN High ≈ 3.5 V, CAN Low ≈ 1.5 V) — check with multimeter and oscilloscope
  • Typical CAN bus termination resistance: ~60 ohms (two 120 Ω resistors in parallel) across CAN High and CAN Low
  • Power supply to module: battery voltage (12 V nominal) present at module Vb pin with key ON
  • Ground:
  • Video/link interfaces (vehicle dependent) may use LVDS or Ethernet — check for expected link/activity when probed with appropriate tool

Diagnostic algorithm

  1. Connect a capable manufacturer scan tool and record all U-codes and related ADAS/camera DTCs. Note freeze frame and occurrence conditions.
  2. Verify vehicle voltage (battery) and ensure stable power (12 V ± acceptable range) before proceeding.
  3. Inspect fuses and relays for the image processing module; replace any blown fuses and retest communication.
  4. Locate the image processing module “C” connector(s). With ignition ON (engine OFF), visually inspect pins for damage, bent pins, corrosion, or water.
  5. With connector mated, use scan tool to attempt communication. If no communication, disconnect and measure Vb (power) and ground at the module connector. Repair any missing power/ground.
  6. Measure CAN High/Low voltages at the module connector. If voltages are out of expected range or stuck dominant, trace wiring to isolate open/short or bad termination. Check for ~60 Ω across CAN H/L with power off.
  7. If voltages appear correct, use an oscilloscope to verify CAN signal integrity and message activity. Look for noise, missing frames, or dropped messages.
  8. Inspect harness routing, especially in the bumper/front camera area; repair damaged wires, chafing or water intrusion. Wiggle test harness while monitoring communication to find intermittent faults.
  9. Check for recent module replacements or software updates. Reprogram or update module software/calibration per manufacturer procedures if required.
  10. If wiring and power are confirmed good and communication still not obtained, consider replacing the image processing module. After repair or replacement, clear codes and perform ADAS calibration or system initialization as required, then road-test to verify.

Likely causes

  • Disconnected or corroded connector at the image processing module
  • Blown fuse or lost power/ground to the module
  • CAN bus open or short (CAN High/Low shorted to each other or to power/ground)
  • Failed image processing module firmware or internal failure
  • Damaged harness at bumper/front-end collision area

Fault status

⚠️ Status
Image Processing Module 'C' not responding on vehicle communication network. ADAS/camera-dependent features may be disabled until communication is restored.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-4.0 hours

Similar codes

U0100 U0115 U0140 U0234 U0235
371

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