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Home / DTC / U0233 — Lost Communication With Side Obstacle Detection Control Module Right

U0233 — Lost Communication With Side Obstacle Detection Control Module Right

Detailed page for trouble code U0233.

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U0233

HYUNDAI U — Network/User

Lost Communication With Side Obstacle Detection Control Module Right

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

Causes

  • Right SOD module powered off or failed
  • Open, short, or high resistance in the CAN high/low wiring to the module
  • Poor power or ground at the module (blown fuse, disconnected/ corroded connector, damaged ground)
  • Intermittent connector pin or harness damage (water intrusion, corrosion, chafe)
  • Faulty gateway/BCM or other module on the same CAN bus
  • Module replaced but not coded/programmed correctly

Symptoms

  • Blind-spot/side obstacle warning message or indicator for right side
  • Right-side obstacle detection or blind-spot assist disabled or unavailable
  • Related warnings or faults stored in other vehicle systems
  • Possible intermittent operation of right-side sensors or warnings
  • No data or module not listed when using a diagnostic scan tool

What to check

  • Read all stored U-codes and freeze frame data with a CAN-capable scan tool; note any other communication faults
  • Verify module presence on network (scan tool module list, CAN bus alive messages)
  • Check fuses/relays powering the SOD module
  • Visually inspect right-side module connector and harness for corrosion, damage, water, or pin issues
  • Measure supply voltage and ground at the module connector (key ON) and verify correct voltages
  • Measure CAN_H and CAN_L voltages at the module connector with key ON and engine OFF

Signal parameters

  • CAN bus idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (dominant state CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V)
  • Expected bus data: periodic alive frames from Right SOD module when active (use scan tool to watch messages)
  • Typical CAN data rates: vehicle may use 250–500 kbps for sensor networks (confirm with factory data)
  • Supply voltage at module: ~12 V battery (key ON), ground near 0 V

Diagnostic algorithm

  1. Connect a diagnostic scan tool and confirm U0233 and any related codes. Record freeze frame and module list.
  2. Clear codes, cycle ignition, and see if U0233 returns to verify persistent vs intermittent.
  3. Confirm whether the Right SOD module appears on the network (module list/alive messages). If absent, proceed.
  4. Inspect the right SOD module connector and harness for corrosion, bent pins, water intrusion, or damage. Repair as needed.
  5. Verify power and ground at the module connector with a DVOM (key ON). Check relevant fuses and relays if no power.
  6. With ignition ON, measure CAN_H and CAN_L at the module connector. Compare to expected idle voltages and to a good node on the same bus.
  7. Check CAN bus continuity between the module connector and the gateway/BCM; look for shorts to battery or ground and for high resistance.
  8. Wiggle or flex harness while monitoring the scan tool and voltages to find intermittent faults.
  9. If wiring and power/ground are good, consider programming/configuration checks: ensure the module is correctly coded and firmware matches vehicle requirements.
  10. Replace the SOD module only after verifying wiring and bus integrity. Reprogram/code the replacement per factory procedure and recheck for U0233 and related faults.
  11. After repairs, clear codes and test-drive to confirm the fault does not return and system functionality is restored.

Likely causes

  • Loose or corroded connector at the right side obstacle detection module
  • Power fuse for the SOD module blown or module not receiving battery voltage
  • Damaged CAN-L or CAN-H wiring from the right SOD module to the main CAN bus
  • Failed SOD module
  • Other module on same CAN segment causing bus errors (gateway/BCM)

Fault status

⚠️ Status
Lost communication with Right Side Obstacle Detection Control Module — right-side obstacle detection unavailable. Inspect CAN bus, power/ground, connectors, and module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours
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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.

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