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Home / DTC / U0235 — Lost Communication With Cruise Control Front Distance Range Sensor

U0235 — Lost Communication With Cruise Control Front Distance Range Sensor

Detailed page for trouble code U0235.

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Code

U0235

HYUNDAI U — Network/User

Lost Communication With Cruise Control Front Distance Range Sensor

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

Causes

  • Damaged or corroded sensor connector pins
  • Broken, shorted or chafed wiring/CAN pair between sensor and ECU
  • Blown fuse or loss of sensor power/ground
  • Sensor module failure (internal electronics)
  • CAN bus fault (open, short to Vb or ground, wrong termination)
  • Aftermarket device or module causing bus interference

Symptoms

  • Adaptive/Smart Cruise Control disabled or unavailable
  • Cruise control warning and/or master warning lamp illuminated
  • Distance monitoring or autonomous braking warnings/messages
  • Related drivability or stability systems may show communication errors
  • DTC U0235 stored (may be accompanied by other U0xxx or U02xx codes)
  • Vehicle may default to non-adaptive cruise functionality

What to check

  • Connect a capable scan tool and read all stored/active codes and freeze frame data
  • Check for related U-codes (e.g., U0100, U0073, U0140) and multiple modules reporting CAN errors
  • Visually inspect the front distance sensor (radar) for damage, contamination, misalignment or loose mounting
  • Inspect the sensor connector for corrosion, bent pins, moisture intrusion or pushed-out pins
  • Trace wiring from sensor to CAN junctions/ECU: look for chafe, pinch, rodent damage, repair sections and splice integrity
  • Check sensor power and ground circuits (verify battery voltage at sensor and a good ground)

Signal parameters

  • Sensor supply voltage: approx. 11–14 V with ignition ON
  • Sensor ground: close to 0 Ω to chassis ground
  • CAN_H idle ~2.5 V, CAN_L idle ~2.5 V (both ~2.5 V recessive); differential during transmission pulses
  • CAN bus termination: ~60 Ω between CAN_H and CAN_L at vehicle level (two 120 Ω resistors in parallel)
  • No excessive bus traffic errors or bus-off conditions reported in scan tool

Diagnostic algorithm

  1. Use scan tool: record U0235, other U-codes, and freeze-frame; note conditions when fault set.
  2. Attempt to communicate with the radar sensor module from the scan tool. If no response, proceed to wiring/connector checks.
  3. Visually inspect and disconnect the sensor connector; check pins for corrosion, damage, or moisture. Reconnect and retry communication.
  4. With ignition ON, measure sensor power and ground at the connector. Repair any supply or ground faults before continuing.
  5. Probe CAN_H and CAN_L at the sensor connector: confirm ~2.5 V idle and verify differential activity while another module transmits. If voltages are incorrect, isolate wiring to locate short or open.
  6. Perform wiggle test on harness and connector while watching live CAN frames for interruptions. Repair damaged wiring or poor connector crimping.
  7. If wiring and power are good, swap with a known-good sensor (if available) or temporarily connect the sensor to a known-good CAN port if vehicle-specific procedures allow. Re-scan for U0235.
  8. Check for other modules causing bus-off or interfering signals. If another module is faulting, repair that module/wiring first.
  9. After repairs, clear codes, perform any required sensor alignment/calibration per factory procedures, and road test to confirm no reoccurrence.
  10. If fault persists with good wiring/power and proper bus signals, replace the front distance range sensor and program/configure per manufacturer requirements.

Likely causes

  • Open or short in sensor CAN wiring or connector
  • Corroded/loose sensor connector or poor ground
  • Front distance (radar) sensor internal failure
  • Fuse or power supply fault to the sensor
  • CAN bus dominant error caused by another module

Fault status

⚠️ Status
Lost Communication With Cruise Control Front Distance Range Sensor — the front distance (radar) sensor is not responding on the vehicle CAN bus. Check sensor power/ground, connector and CAN wiring; inspect sensor condition and module communication.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0073 U0140 U0236 U0243
371

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