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Home / DTC / U059E — Invalid Data Received From NOX Sensor “A”

U059E — Invalid Data Received From NOX Sensor “A”

Detailed page for trouble code U059E.

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U059E

HYUNDAI U — Network/User

Invalid Data Received From NOX Sensor “A”

Brand: HYUNDAI
Type: U — Network/User
Views: UK: 16 EN: 67 RU: 33
AI status
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Page language: EN

Causes

  • Failed or degrading NOx sensor (internal fault or contamination)
  • Open, short, or high-resistance wiring between sensor and control module
  • Corroded or loose connector at sensor or module
  • Heater circuit failure (loss of sensor operating temperature)
  • CAN/LIN communication error or intermittent bus fault
  • Incorrect or out-of-date ECU/PCM software/calibration

Symptoms

  • Malfunction Indicator Lamp (MIL) or emissions warning illuminated
  • Reduced or altered aftertreatment control (SCR/DEF) performance
  • Possible engine derate or limp-home mode depending on vehicle logic
  • Failed or poor results on emissions testing
  • Stored related codes for NOx sensor circuit, heater, or CAN bus communication

What to check

  • Read and record U059E and any other stored/related DTCs and freeze frame data
  • Check live data for NOx sensor "A" (raw value, expected range, and heater status) using a capable scan tool
  • Inspect sensor connector and wiring for corrosion, heat damage, pin push-out, or broken wires
  • Verify sensor power (12V or ignition-switched), ground, and heater supply with key ON
  • Check CAN bus health: look for high bus error counts, low-level voltage issues, or other modules reporting comms errors
  • Perform a wiggle test on harness while monitoring live data for intermittent changes

Signal parameters

  • Sensor signal: typically a 0–5 V analog output or digital/CAN NOx concentration message (vehicle-specific)
  • Heater supply: nominal battery/ignition voltage (~12 V) when heater commanded ON
  • Heater resistance: sensor-specific (typically low ohms; check service data)
  • Expected NOx concentration values: near-zero at idle after cold start for a healthy system; ppm values increase under load (vehicle-specific)
  • CAN/LIN bus voltages: CANH ~2.5–3.5 V, CANL ~1.5–2.5 V idle (verify with scope/service data)

Diagnostic algorithm

  1. Connect a full-function scan tool. Read and log all DTCs and live data for NOx sensor A and related modules. Note freeze frame conditions.
  2. Clear codes and perform a short test drive to see if U059E returns and to capture live-data behavior.
  3. With ignition ON, measure sensor connector pins: supply voltage, ground continuity, and heater supply when heater is commanded. Compare to manufacturer specs.
  4. Backprobe the sensor signal while monitoring live data on the scan tool. Confirm signal changes with engine load/temperature. Look for stuck, erratic, or out-of-range values.
  5. Inspect harness and connector for damage, heat chafing, corrosion, or water ingress. Repair any damaged wiring or terminal issues.
  6. Check CAN bus for errors: scan for other U-codes, measure bus voltages and noise with oscilloscope if available. Repair any bus faults.
  7. If wiring and bus are good, test or substitute NOx sensor (if available) to confirm sensor fault. Re-test after replacement.
  8. Verify ECU/PCM software level and apply updates or reflash if a software-related communication error is suspected.
  9. After repairs, clear codes and confirm the fault does not return over multiple drive cycles and that NOx readings behave as expected.

Likely causes

  • Damaged NOx sensor wiring or connector (most common)
  • Failed NOx sensor (contaminated or internal electronics fault)
  • Faulty ground or blown fuse affecting sensor power/heater
  • Intermittent CAN bus communication or module receiving corrupted data
  • ECU software bug or recent module replacement requiring reflash

Fault status

⚠️ Status
Invalid data received from NOx Sensor A — incoming sensor value or message is out of expected range or corrupted; check sensor, wiring, heater supply, and communication bus.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

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