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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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Code

U059E

Generic U — Network/User

Invalid Data Received From NOx Sensor A

Brand: Generic
Type: U — Network/User
Views: UK: 12 EN: 40 RU: 26
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed or degrading NOx sensor (internal fault or contamination)
  • Open, short, or damaged sensor wiring or connector
  • Poor power supply or ground to the sensor (heater/power circuit)
  • Faulty CAN/LIN communication or bus interference
  • Intermittent connector corrosion or water intrusion
  • Exhaust system contamination (oil, coolant, soot) affecting sensor

Symptoms

  • Malfunction Indicator Lamp (MIL) or warning light illuminated
  • Reduced or disabled SCR/aftertreatment functions (possible limp or regen issues)
  • Failed emissions test or increased NOx emissions
  • Possible diagnostic trouble codes related to communications or NOx sensors
  • Occasional or persistent fault depending on cause

What to check

  • Scan tool: read U059E plus any related codes and freeze frame data
  • Monitor live data: NOx sensor A values, sensor temperature, heater status, and message stream
  • Visually inspect sensor, connector, and wiring for damage, corrosion, contamination, or loose pins
  • Check supply voltage and ground at sensor connector with ignition on
  • Check CAN/LIN bus health (voltage levels, termination, and error counters)
  • Perform wiggle test on harness while watching live data for intermittent faults

Signal parameters

  • NOx concentration (ppm) or sensor output (V) — should vary with engine load
  • Sensor heater current (A) or heater resistance (Ω)
  • Sensor temperature (°C) from sensor or predicted value
  • Supply voltage to sensor (V) and ground continuity (Ω)
  • CAN/LIN message ID, frequency (Hz), CRC/checksum validity
  • Bus voltages (CAN_H, CAN_L idle ~2.5 V) and bus error counts

Diagnostic algorithm

  1. Connect a professional scan tool. Record all DTCs, freeze frame, and live NOx sensor data. Note when the fault first occurred.
  2. Clear the code and perform a key-on/engine-run recheck to see if U059E returns (identify intermittent vs. persistent).
  3. Visually inspect the NOx sensor and harness for damage, bent pins, corrosion, soot, oil or coolant contamination, and secure fitment.
  4. Verify connector pin voltages: with ignition on, measure sensor power supply and ground at the harness. Compare to expected battery/ignition voltages.
  5. Check sensor heater: measure resistance or heater current per vehicle spec. An open or out-of-spec heater suggests sensor replacement.
  6. Monitor live NOx signal while varying engine load. Confirm the sensor output changes plausibly and is within expected ranges.
  7. Inspect CAN/LIN communication: check bus voltages, termination resistances and use an oscilloscope if available to confirm clean messages. Look for CRC or checksum faults and message timeouts.
  8. Perform a wiggle test of the harness and connector while watching live data for intermittent drops or errors.
  9. If wiring/power/communication checks pass, replace the NOx sensor with a known-good unit or OEM part. Relearn or adapt per manufacturer procedures if required.
  10. After repair, clear codes and road test under various conditions to ensure the fault does not return. If persistent, investigate the control module or software updates/TSBs.

Likely causes

  • NOx sensor internal fault (most common)
  • Damaged or corroded connector/wiring at the sensor
  • Sensor heater circuit failure or no power/ground
  • CAN bus message errors or failed transceiver

Fault status

⚠️ Status
Invalid data or corrupt communication received from NOx Sensor A — sensor output or message failed validation (out of range, checksum/CRC error, or timed out).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

U0100 U0155 U0415 P2201 U0299
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Code

U059E

HYUNDAI U — Network/User

Invalid Data Received From NOX Sensor “A”

Brand: HYUNDAI
Type: U — Network/User
Views: UK: 12 EN: 37 RU: 25
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed or degrading NOx sensor (internal fault or contamination)
  • Open, short, or damaged sensor wiring or connector
  • Poor power supply or ground to the sensor (heater/power circuit)
  • Faulty CAN/LIN communication or bus interference
  • Intermittent connector corrosion or water intrusion
  • Exhaust system contamination (oil, coolant, soot) affecting sensor

Symptoms

  • Malfunction Indicator Lamp (MIL) or warning light illuminated
  • Reduced or disabled SCR/aftertreatment functions (possible limp or regen issues)
  • Failed emissions test or increased NOx emissions
  • Possible diagnostic trouble codes related to communications or NOx sensors
  • Occasional or persistent fault depending on cause

What to check

  • Scan tool: read U059E plus any related codes and freeze frame data
  • Monitor live data: NOx sensor A values, sensor temperature, heater status, and message stream
  • Visually inspect sensor, connector, and wiring for damage, corrosion, contamination, or loose pins
  • Check supply voltage and ground at sensor connector with ignition on
  • Check CAN/LIN bus health (voltage levels, termination, and error counters)
  • Perform wiggle test on harness while watching live data for intermittent faults

Signal parameters

  • NOx concentration (ppm) or sensor output (V) — should vary with engine load
  • Sensor heater current (A) or heater resistance (Ω)
  • Sensor temperature (°C) from sensor or predicted value
  • Supply voltage to sensor (V) and ground continuity (Ω)
  • CAN/LIN message ID, frequency (Hz), CRC/checksum validity
  • Bus voltages (CAN_H, CAN_L idle ~2.5 V) and bus error counts

Diagnostic algorithm

  1. Connect a professional scan tool. Record all DTCs, freeze frame, and live NOx sensor data. Note when the fault first occurred.
  2. Clear the code and perform a key-on/engine-run recheck to see if U059E returns (identify intermittent vs. persistent).
  3. Visually inspect the NOx sensor and harness for damage, bent pins, corrosion, soot, oil or coolant contamination, and secure fitment.
  4. Verify connector pin voltages: with ignition on, measure sensor power supply and ground at the harness. Compare to expected battery/ignition voltages.
  5. Check sensor heater: measure resistance or heater current per vehicle spec. An open or out-of-spec heater suggests sensor replacement.
  6. Monitor live NOx signal while varying engine load. Confirm the sensor output changes plausibly and is within expected ranges.
  7. Inspect CAN/LIN communication: check bus voltages, termination resistances and use an oscilloscope if available to confirm clean messages. Look for CRC or checksum faults and message timeouts.
  8. Perform a wiggle test of the harness and connector while watching live data for intermittent drops or errors.
  9. If wiring/power/communication checks pass, replace the NOx sensor with a known-good unit or OEM part. Relearn or adapt per manufacturer procedures if required.
  10. After repair, clear codes and road test under various conditions to ensure the fault does not return. If persistent, investigate the control module or software updates/TSBs.

Likely causes

  • NOx sensor internal fault (most common)
  • Damaged or corroded connector/wiring at the sensor
  • Sensor heater circuit failure or no power/ground
  • CAN bus message errors or failed transceiver

Fault status

⚠️ Status
Invalid data or corrupt communication received from NOx Sensor A — sensor output or message failed validation (out of range, checksum/CRC error, or timed out).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

U0100 U0155 U0415 P2201 U0299
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