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Home / DTC / U0433 — Invalid Data Received From Cruise Control Front Distance Range Sensor Single Sensor or Center

U0433 — Invalid Data Received From Cruise Control Front Distance Range Sensor Single Sensor or Center

Detailed page for trouble code U0433.

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Code

U0433

HYUNDAI U — Network/User

Invalid Data Received From Cruise Control Front Distance Range Sensor Single Sensor or Center

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

Causes

  • Front distance/range sensor hardware fault (radar/lidar/ultrasonic module).
  • Damaged or corroded wiring or connector to the sensor.
  • CAN/LIN communication errors or bus wiring fault.
  • Blown fuse or poor power/ground to the sensor.
  • Sensor contamination, obstruction, or physical misalignment.
  • Software mismatch, calibration required, or ECU module fault.

Symptoms

  • Adaptive Cruise Control (ACC) or Cruise Control disabled or unavailable.
  • ACC warning lamp or message displayed on the instrument cluster.
  • Cruise will not engage, or ACC does not detect vehicles ahead.
  • Intermittent ACC operation or sudden cancellation of ACC.
  • Related stability/driver assistance features may be limited or show warnings.

What to check

  • Use a factory-level or capable scan tool to read U0433 and any related active/pending codes and freeze-frame data.
  • Verify sensor health/status data on the scan tool (distance, object count, signal quality, status flags).
  • Visually inspect the front sensor area for contamination, damage, misalignment, or obstructions (ice, snow, aftermarket parts).
  • Inspect sensor connector for corrosion, bent pins, or water intrusion; confirm secure mating.
  • Check supply voltage at the sensor connector (typical 11–14 V) and measure good ground reference.
  • Check related fuses and relays for power to sensor/ACC system.

Signal parameters

  • Sensor power: expected ~11–14 V at harness supply pin (engine running).
  • Ground continuity: low ohms to chassis ground (
  • CAN/LIN bus: CAN_H ~2.5 V idle, CAN_L ~2.5 V idle; differential ~2–3 V during activity; termination ~60 Ω across H & L at rest.
  • Data update rate: sensor object/distance updates typically multiple times per second (varies by design).
  • Distance output: measured object range (meters) and status/valid flag in the message payload; invalid/NaN or out-of-range values indicate error.
  • Signal integrity: checksum or CRC validity flag for messages (if supported) should be OK; repeated CRC failures indicate corrupted frames.

Diagnostic algorithm

  1. Connect a scan tool and record U0433 plus any other active/pending codes and freeze-frame data. Note sensor reported values and status flags.
  2. Visually inspect the sensor area. Remove dirt, ice, snow, or obstructions; ensure aftermarket parts are not blocking sensor view.
  3. Inspect the sensor connector and harness for damage, corrosion, or loose pins. Repair or replace damaged connectors/wiring as needed.
  4. Verify battery voltage and check the fuse(s) supplying the sensor. Repair poor power or replace blown fuse if necessary.
  5. Backprobe sensor connector: verify supply voltage and ground with ignition ON/engine running. If voltages are out of range, trace and repair power/ground circuit.
  6. Monitor live CAN messages from the sensor with the scan tool or CAN sniffer. Confirm messages are present, consistent, and not corrupted. Check for bus errors or loss of frames.
  7. Perform continuity and resistance checks on the wiring between the sensor and the ECU/CAN junction. Repair any opens/shorts/intermittents.
  8. If wiring and power are good but invalid data continues, try clearing codes and re-check operation. If the code returns, replace the front distance/range sensor module.
  9. After replacing sensor or repairing wiring, perform any required module programming, software updates, and sensor alignment/calibration per manufacturer procedure.
  10. Re-scan for codes and verify the ACC/cruise system functions normally and that U0433 does not return.

Likely causes

  • Faulty front radar module (internal electronics failure).
  • Intermittent/open/short in harness between sensor and main ECU/CAN bus.
  • Poor ground at sensor mounting or chassis ground point.
  • Connector corrosion or bent pins at sensor or main harness.
  • Sensor covered by dirt, snow, ice, aftermarket trim or tow hitch blocking line-of-sight.
  • Vehicle software needing an update or sensor needing re-calibration after replacement or repair.

Fault status

⚠️ Status
Invalid data received from front distance/range sensor (single or center) — sensor data missing, corrupted, or out of range.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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