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Home / DTC / U0232 — Lost Communication With Side Obstacle Detection Control Module A

U0232 — Lost Communication With Side Obstacle Detection Control Module A

Detailed page for trouble code U0232.

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U0232

Generic U — Network/User

Lost Communication With Side Obstacle Detection Control Module A

Brand: Generic
Type: U — Network/User
Views: UK: 19 EN: 45 RU: 39
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or disconnected Side Obstacle Detection Control Module A
  • Open, short, or high-resistance wiring between the module and the vehicle CAN/data bus
  • Corroded or loose connector pins at the module or junctions
  • Blown fuse, faulty power feed or missing ground to the module
  • CAN bus physical-layer problems (missing termination, short to power/ground)
  • Module in sleep/low-power state or failed to wake

Symptoms

  • Warning message or indicator for side obstacle/parking assist or blind-spot system
  • Side Obstacle Detection features disabled or showing 'Unavailable'
  • Related driver-assistance systems degraded or inoperative
  • One or more communication-related DTCs present in vehicle network modules
  • Intermittent or permanent loss of radar/sonar objects or alerts
  • No response from the module when queried with a diagnostic scan tool

What to check

  • Retrieve all stored and pending DTCs from all control modules and record freeze-frame data
  • Visually inspect the Side Obstacle Detection module connector(s) for corrosion, bent pins, or water intrusion
  • Verify vehicle battery voltage and charging system; ensure >=12.2 V at rest and 13.5–14.5 V with engine running
  • Check fuses and relays that supply power to the Side Obstacle Detection module
  • Confirm good chassis and module ground(s) with a low-resistance measurement
  • Use a scan tool to query the module and list modules on the CAN bus; note whether the node appears

Signal parameters

  • CAN bus idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (differential ≈ 0 V when idle), when active differential ≈ ±2 V
  • CAN bus termination: approximately 60 ohms measured between CAN_H and CAN_L across the whole bus (two 120 Ω in parallel)
  • Typical CAN data rates used by ADAS modules: 250 kbps or 500 kbps (manufacturer dependent) — confirm with wiring diagrams
  • Module power pin: battery voltage ≈ 11–14.5 V (key ON/engine running); ground continuity to chassis < 0.5 Ω ideally
  • Module should respond to diagnostic requests (UDS/CAN) when present — lack of response indicates comm failure

Diagnostic algorithm

  1. Record DTCs: Connect a capable scan tool and record U0232 and any other related network codes from all modules.
  2. Verify battery/charging: Confirm proper battery voltage and charging; low voltage can cause modules to sleep or fail to respond.
  3. Inspect connectors and fuses: Visually inspect the Side Obstacle Detection module connectors, power/ground fuses and relays. Repair or replace as needed.
  4. Check module power and ground: With key ON, measure voltage at the module power pin and check ground continuity to chassis. Repair open circuits.
  5. Confirm module presence on bus: Use the scan tool to list nodes on the CAN network. If the module is absent, proceed to physical-layer checks.
  6. Measure CAN voltages: Probe CAN_H and CAN_L at the module connector with key ON (engine off). Verify idle voltages ~2.5 V and proper differential during activity. If abnormal, trace wiring for shorts/opens.
  7. Check bus termination and continuity: Measure resistance between CAN_H and CAN_L across the whole bus and inspect wiring harness for damage. Unplugging other modules may help isolate the fault.
  8. Perform wiggle and isolation tests: Wiggle harnesses and connectors while monitoring for return of communications or DTC changes to find intermittent faults.
  9. Replace or reflash module only after verifying wiring and power: If wiring and power are confirmed good and the module still does not respond, consider reflashing software or replacing the module per manufacturer procedures. Ensure correct configuration/coding.
  10. Recheck network: After repairs, clear codes and verify that the module appears on the network and that no related DTCs return. Test the Side Obstacle Detection function for proper operation.

Likely causes

  • Damaged or loose CAN wiring or connector at the Side Obstacle Detection module
  • Loss of module power or ground (blown fuse, bad connector)
  • Module not awake or not configured on the network (software issue)
  • CAN transceiver failure in the module or elsewhere on the same bus
  • Corrosion or water intrusion at module connector

Fault status

⚠️ Status
Lost Communication With Side Obstacle Detection Control Module A
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours
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Code

U0232

HYUNDAI U — Network/User

Lost Communication With Side Obstacle Detection Control Module Left

Brand: HYUNDAI
Type: U — Network/User
Views: UK: 16 EN: 62 RU: 27
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or disconnected Side Obstacle Detection Control Module A
  • Open, short, or high-resistance wiring between the module and the vehicle CAN/data bus
  • Corroded or loose connector pins at the module or junctions
  • Blown fuse, faulty power feed or missing ground to the module
  • CAN bus physical-layer problems (missing termination, short to power/ground)
  • Module in sleep/low-power state or failed to wake

Symptoms

  • Warning message or indicator for side obstacle/parking assist or blind-spot system
  • Side Obstacle Detection features disabled or showing 'Unavailable'
  • Related driver-assistance systems degraded or inoperative
  • One or more communication-related DTCs present in vehicle network modules
  • Intermittent or permanent loss of radar/sonar objects or alerts
  • No response from the module when queried with a diagnostic scan tool

What to check

  • Retrieve all stored and pending DTCs from all control modules and record freeze-frame data
  • Visually inspect the Side Obstacle Detection module connector(s) for corrosion, bent pins, or water intrusion
  • Verify vehicle battery voltage and charging system; ensure >=12.2 V at rest and 13.5–14.5 V with engine running
  • Check fuses and relays that supply power to the Side Obstacle Detection module
  • Confirm good chassis and module ground(s) with a low-resistance measurement
  • Use a scan tool to query the module and list modules on the CAN bus; note whether the node appears

Signal parameters

  • CAN bus idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (differential ≈ 0 V when idle), when active differential ≈ ±2 V
  • CAN bus termination: approximately 60 ohms measured between CAN_H and CAN_L across the whole bus (two 120 Ω in parallel)
  • Typical CAN data rates used by ADAS modules: 250 kbps or 500 kbps (manufacturer dependent) — confirm with wiring diagrams
  • Module power pin: battery voltage ≈ 11–14.5 V (key ON/engine running); ground continuity to chassis < 0.5 Ω ideally
  • Module should respond to diagnostic requests (UDS/CAN) when present — lack of response indicates comm failure

Diagnostic algorithm

  1. Record DTCs: Connect a capable scan tool and record U0232 and any other related network codes from all modules.
  2. Verify battery/charging: Confirm proper battery voltage and charging; low voltage can cause modules to sleep or fail to respond.
  3. Inspect connectors and fuses: Visually inspect the Side Obstacle Detection module connectors, power/ground fuses and relays. Repair or replace as needed.
  4. Check module power and ground: With key ON, measure voltage at the module power pin and check ground continuity to chassis. Repair open circuits.
  5. Confirm module presence on bus: Use the scan tool to list nodes on the CAN network. If the module is absent, proceed to physical-layer checks.
  6. Measure CAN voltages: Probe CAN_H and CAN_L at the module connector with key ON (engine off). Verify idle voltages ~2.5 V and proper differential during activity. If abnormal, trace wiring for shorts/opens.
  7. Check bus termination and continuity: Measure resistance between CAN_H and CAN_L across the whole bus and inspect wiring harness for damage. Unplugging other modules may help isolate the fault.
  8. Perform wiggle and isolation tests: Wiggle harnesses and connectors while monitoring for return of communications or DTC changes to find intermittent faults.
  9. Replace or reflash module only after verifying wiring and power: If wiring and power are confirmed good and the module still does not respond, consider reflashing software or replacing the module per manufacturer procedures. Ensure correct configuration/coding.
  10. Recheck network: After repairs, clear codes and verify that the module appears on the network and that no related DTCs return. Test the Side Obstacle Detection function for proper operation.

Likely causes

  • Damaged or loose CAN wiring or connector at the Side Obstacle Detection module
  • Loss of module power or ground (blown fuse, bad connector)
  • Module not awake or not configured on the network (software issue)
  • CAN transceiver failure in the module or elsewhere on the same bus
  • Corrosion or water intrusion at module connector

Fault status

⚠️ Status
Lost Communication With Side Obstacle Detection Control Module A
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

U0232

LAND ROVER U — Network/User

Lost communication with the obstacle detection control module on the left side

Brand: LAND ROVER
Type: U — Network/User
Views: UK: 8 EN: 19 RU: 18
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or disconnected Side Obstacle Detection Control Module A
  • Open, short, or high-resistance wiring between the module and the vehicle CAN/data bus
  • Corroded or loose connector pins at the module or junctions
  • Blown fuse, faulty power feed or missing ground to the module
  • CAN bus physical-layer problems (missing termination, short to power/ground)
  • Module in sleep/low-power state or failed to wake

Symptoms

  • Warning message or indicator for side obstacle/parking assist or blind-spot system
  • Side Obstacle Detection features disabled or showing 'Unavailable'
  • Related driver-assistance systems degraded or inoperative
  • One or more communication-related DTCs present in vehicle network modules
  • Intermittent or permanent loss of radar/sonar objects or alerts
  • No response from the module when queried with a diagnostic scan tool

What to check

  • Retrieve all stored and pending DTCs from all control modules and record freeze-frame data
  • Visually inspect the Side Obstacle Detection module connector(s) for corrosion, bent pins, or water intrusion
  • Verify vehicle battery voltage and charging system; ensure >=12.2 V at rest and 13.5–14.5 V with engine running
  • Check fuses and relays that supply power to the Side Obstacle Detection module
  • Confirm good chassis and module ground(s) with a low-resistance measurement
  • Use a scan tool to query the module and list modules on the CAN bus; note whether the node appears

Signal parameters

  • CAN bus idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (differential ≈ 0 V when idle), when active differential ≈ ±2 V
  • CAN bus termination: approximately 60 ohms measured between CAN_H and CAN_L across the whole bus (two 120 Ω in parallel)
  • Typical CAN data rates used by ADAS modules: 250 kbps or 500 kbps (manufacturer dependent) — confirm with wiring diagrams
  • Module power pin: battery voltage ≈ 11–14.5 V (key ON/engine running); ground continuity to chassis < 0.5 Ω ideally
  • Module should respond to diagnostic requests (UDS/CAN) when present — lack of response indicates comm failure

Diagnostic algorithm

  1. Record DTCs: Connect a capable scan tool and record U0232 and any other related network codes from all modules.
  2. Verify battery/charging: Confirm proper battery voltage and charging; low voltage can cause modules to sleep or fail to respond.
  3. Inspect connectors and fuses: Visually inspect the Side Obstacle Detection module connectors, power/ground fuses and relays. Repair or replace as needed.
  4. Check module power and ground: With key ON, measure voltage at the module power pin and check ground continuity to chassis. Repair open circuits.
  5. Confirm module presence on bus: Use the scan tool to list nodes on the CAN network. If the module is absent, proceed to physical-layer checks.
  6. Measure CAN voltages: Probe CAN_H and CAN_L at the module connector with key ON (engine off). Verify idle voltages ~2.5 V and proper differential during activity. If abnormal, trace wiring for shorts/opens.
  7. Check bus termination and continuity: Measure resistance between CAN_H and CAN_L across the whole bus and inspect wiring harness for damage. Unplugging other modules may help isolate the fault.
  8. Perform wiggle and isolation tests: Wiggle harnesses and connectors while monitoring for return of communications or DTC changes to find intermittent faults.
  9. Replace or reflash module only after verifying wiring and power: If wiring and power are confirmed good and the module still does not respond, consider reflashing software or replacing the module per manufacturer procedures. Ensure correct configuration/coding.
  10. Recheck network: After repairs, clear codes and verify that the module appears on the network and that no related DTCs return. Test the Side Obstacle Detection function for proper operation.

Likely causes

  • Damaged or loose CAN wiring or connector at the Side Obstacle Detection module
  • Loss of module power or ground (blown fuse, bad connector)
  • Module not awake or not configured on the network (software issue)
  • CAN transceiver failure in the module or elsewhere on the same bus
  • Corrosion or water intrusion at module connector

Fault status

⚠️ Status
Lost Communication With Side Obstacle Detection Control Module A
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours
Workshop Manuals

Repair manuals for LAND ROVER

3

Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

199,00 UAH
Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
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Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)

Workshop Manual
Defender Years: 1999–2002 Manual in English 7.6 MB
Short description

Workshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.

199,00 UAH
Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
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Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

Workshop Manual
Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

199,00 UAH
Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
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