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Home / DTC / U023B — Lost Communication With Image Processing Module B

U023B — Lost Communication With Image Processing Module B

Detailed page for trouble code U023B.

34,336codes
59brands
11,845generic
22,491specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
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Code

U023B

Generic U — Network/User

Lost Communication With Image Processing Module B

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

Causes

  • Open or shorted wiring between the image processing module and the vehicle data bus (CAN/LIN)
  • Faulty image processing module (Module B)
  • Module has no battery power or missing ground
  • Blown fuse or relays supplying the module
  • Corroded or disconnected connector at the module or camera
  • CAN bus termination or wiring fault (low/high resistance, short to battery/ground)

Symptoms

  • Malfunction indicator lamp or message on dash (e.g., ADAS warning)
  • Camera image(s) unavailable on infotainment or cluster screens
  • ADAS features degraded or disabled (lane assist, emergency braking, adaptive cruise)
  • Multiple related U-codes for camera or vision modules
  • Intermittent operation of vision-based features

What to check

  • Read all stored and pending DTCs from all modules and note freeze-frame data
  • Check for additional U-codes indicating broader CAN bus issues (U0100, U0121, U0073, etc.)
  • Verify module presence using a scan tool (is Image Processing Module B listed/responding?)
  • Inspect fuses and relays that supply the image processing module
  • Visually inspect connectors and harnesses at the image processing module and camera for corrosion, damage, or water intrusion
  • Measure module supply voltage and ground continuity with ignition ON and during cranking

Signal parameters

  • CAN idle voltages (typical): CAN_H ~2.5V, CAN_L ~2.5V (differential idle near 0V); dominant ~CAN_H 3.5V / CAN_L 1.5V (varies by vehicle)
  • Bus termination resistance: ~60 ohms measured across CAN_H to CAN_L (two 120-ohm terminators in parallel)
  • Module supply voltage: battery voltage at module connector with ignition ON
  • Module ground resistance: low ohms to chassis ground
  • Expected message IDs or PDU addresses for Image Processing Module B (use OEM data to verify presence and frequency)

Diagnostic algorithm

  1. Confirm the code and capture related U-codes and freeze-frame data with a scan tool; note when the fault occurred and any recent repairs.
  2. Check service information for module location, connector pinout, power/ground/fuse/relay details and any available manufacturer troubleshooting flow.
  3. Verify module supply voltage and ground at the module connector. Replace blown fuses or faulty relays as required.
  4. Visually inspect connector(s) and wiring for damage, corrosion, or water ingress. Repair or replace damaged sections.
  5. Use a scan tool to check whether the module is listed and responding. If the module is not present, check wiring between the module and the bus.
  6. Measure CAN termination resistance and perform a continuity check on CAN_H and CAN_L between the module and an accessible point on the bus.
  7. Use an oscilloscope or high-speed CAN diagnostic tool to check for valid CAN waveforms at the module connector; look for noise, missing frames, or bus-loading issues.
  8. If wiring and power are good but communications are absent, try re-seating the connector or replacing the module only after confirming via bench test or replacement diagnostics procedure.
  9. After repairs, clear codes and perform road test / functional verification of camera/ADAS features; re-scan to confirm no recurrence.
  10. If intermittent or complex network faults persist, consult manufacturer technical bulletins or escalate to module replacement with proper programming/calibration.

Likely causes

  • Defective module software or firmware
  • Power or ground circuit fault to the image processing module
  • Damaged / disconnected CAN wiring or connector at the module
  • Failed fuse or relay in module supply circuit
  • Bus termination resistor open or other CAN network fault

Fault status

⚠️ Status
Lost Communication With Image Processing Module B — module not responding on vehicle network; expected CAN messages from Image Processing Module B are missing.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-4 hours

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Code

U023B

HYUNDAI U — Network/User

Lost Communication With Image Processing Module “B”

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

Causes

  • Open or shorted wiring between the image processing module and the vehicle data bus (CAN/LIN)
  • Faulty image processing module (Module B)
  • Module has no battery power or missing ground
  • Blown fuse or relays supplying the module
  • Corroded or disconnected connector at the module or camera
  • CAN bus termination or wiring fault (low/high resistance, short to battery/ground)

Symptoms

  • Malfunction indicator lamp or message on dash (e.g., ADAS warning)
  • Camera image(s) unavailable on infotainment or cluster screens
  • ADAS features degraded or disabled (lane assist, emergency braking, adaptive cruise)
  • Multiple related U-codes for camera or vision modules
  • Intermittent operation of vision-based features

What to check

  • Read all stored and pending DTCs from all modules and note freeze-frame data
  • Check for additional U-codes indicating broader CAN bus issues (U0100, U0121, U0073, etc.)
  • Verify module presence using a scan tool (is Image Processing Module B listed/responding?)
  • Inspect fuses and relays that supply the image processing module
  • Visually inspect connectors and harnesses at the image processing module and camera for corrosion, damage, or water intrusion
  • Measure module supply voltage and ground continuity with ignition ON and during cranking

Signal parameters

  • CAN idle voltages (typical): CAN_H ~2.5V, CAN_L ~2.5V (differential idle near 0V); dominant ~CAN_H 3.5V / CAN_L 1.5V (varies by vehicle)
  • Bus termination resistance: ~60 ohms measured across CAN_H to CAN_L (two 120-ohm terminators in parallel)
  • Module supply voltage: battery voltage at module connector with ignition ON
  • Module ground resistance: low ohms to chassis ground
  • Expected message IDs or PDU addresses for Image Processing Module B (use OEM data to verify presence and frequency)

Diagnostic algorithm

  1. Confirm the code and capture related U-codes and freeze-frame data with a scan tool; note when the fault occurred and any recent repairs.
  2. Check service information for module location, connector pinout, power/ground/fuse/relay details and any available manufacturer troubleshooting flow.
  3. Verify module supply voltage and ground at the module connector. Replace blown fuses or faulty relays as required.
  4. Visually inspect connector(s) and wiring for damage, corrosion, or water ingress. Repair or replace damaged sections.
  5. Use a scan tool to check whether the module is listed and responding. If the module is not present, check wiring between the module and the bus.
  6. Measure CAN termination resistance and perform a continuity check on CAN_H and CAN_L between the module and an accessible point on the bus.
  7. Use an oscilloscope or high-speed CAN diagnostic tool to check for valid CAN waveforms at the module connector; look for noise, missing frames, or bus-loading issues.
  8. If wiring and power are good but communications are absent, try re-seating the connector or replacing the module only after confirming via bench test or replacement diagnostics procedure.
  9. After repairs, clear codes and perform road test / functional verification of camera/ADAS features; re-scan to confirm no recurrence.
  10. If intermittent or complex network faults persist, consult manufacturer technical bulletins or escalate to module replacement with proper programming/calibration.

Likely causes

  • Defective module software or firmware
  • Power or ground circuit fault to the image processing module
  • Damaged / disconnected CAN wiring or connector at the module
  • Failed fuse or relay in module supply circuit
  • Bus termination resistor open or other CAN network fault

Fault status

⚠️ Status
Lost Communication With Image Processing Module B — module not responding on vehicle network; expected CAN messages from Image Processing Module B are missing.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-4 hours

Similar codes

U0235 U023C U0100 U0073 U0121 U0140
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Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HYUNDAI

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

U023B

LAND ROVER U — Network/User

Lost communication with image processing module B

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

Causes

  • Open or shorted wiring between the image processing module and the vehicle data bus (CAN/LIN)
  • Faulty image processing module (Module B)
  • Module has no battery power or missing ground
  • Blown fuse or relays supplying the module
  • Corroded or disconnected connector at the module or camera
  • CAN bus termination or wiring fault (low/high resistance, short to battery/ground)

Symptoms

  • Malfunction indicator lamp or message on dash (e.g., ADAS warning)
  • Camera image(s) unavailable on infotainment or cluster screens
  • ADAS features degraded or disabled (lane assist, emergency braking, adaptive cruise)
  • Multiple related U-codes for camera or vision modules
  • Intermittent operation of vision-based features

What to check

  • Read all stored and pending DTCs from all modules and note freeze-frame data
  • Check for additional U-codes indicating broader CAN bus issues (U0100, U0121, U0073, etc.)
  • Verify module presence using a scan tool (is Image Processing Module B listed/responding?)
  • Inspect fuses and relays that supply the image processing module
  • Visually inspect connectors and harnesses at the image processing module and camera for corrosion, damage, or water intrusion
  • Measure module supply voltage and ground continuity with ignition ON and during cranking

Signal parameters

  • CAN idle voltages (typical): CAN_H ~2.5V, CAN_L ~2.5V (differential idle near 0V); dominant ~CAN_H 3.5V / CAN_L 1.5V (varies by vehicle)
  • Bus termination resistance: ~60 ohms measured across CAN_H to CAN_L (two 120-ohm terminators in parallel)
  • Module supply voltage: battery voltage at module connector with ignition ON
  • Module ground resistance: low ohms to chassis ground
  • Expected message IDs or PDU addresses for Image Processing Module B (use OEM data to verify presence and frequency)

Diagnostic algorithm

  1. Confirm the code and capture related U-codes and freeze-frame data with a scan tool; note when the fault occurred and any recent repairs.
  2. Check service information for module location, connector pinout, power/ground/fuse/relay details and any available manufacturer troubleshooting flow.
  3. Verify module supply voltage and ground at the module connector. Replace blown fuses or faulty relays as required.
  4. Visually inspect connector(s) and wiring for damage, corrosion, or water ingress. Repair or replace damaged sections.
  5. Use a scan tool to check whether the module is listed and responding. If the module is not present, check wiring between the module and the bus.
  6. Measure CAN termination resistance and perform a continuity check on CAN_H and CAN_L between the module and an accessible point on the bus.
  7. Use an oscilloscope or high-speed CAN diagnostic tool to check for valid CAN waveforms at the module connector; look for noise, missing frames, or bus-loading issues.
  8. If wiring and power are good but communications are absent, try re-seating the connector or replacing the module only after confirming via bench test or replacement diagnostics procedure.
  9. After repairs, clear codes and perform road test / functional verification of camera/ADAS features; re-scan to confirm no recurrence.
  10. If intermittent or complex network faults persist, consult manufacturer technical bulletins or escalate to module replacement with proper programming/calibration.

Likely causes

  • Defective module software or firmware
  • Power or ground circuit fault to the image processing module
  • Damaged / disconnected CAN wiring or connector at the module
  • Failed fuse or relay in module supply circuit
  • Bus termination resistor open or other CAN network fault

Fault status

⚠️ Status
Lost Communication With Image Processing Module B — module not responding on vehicle network; expected CAN messages from Image Processing Module B are missing.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-4 hours

Similar codes

U0235 U023C U0100 U0073 U0121 U0140
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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