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Home / DTC / U049E — Invalid Data Received From Direct Ozone Reduction Catalyst Temperature Sensor

U049E — Invalid Data Received From Direct Ozone Reduction Catalyst Temperature Sensor

Detailed page for trouble code U049E.

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U049E

Generic U — Network/User

Invalid Data Received From Direct Ozone Reduction Catalyst Temperature Sensor

Brand: Generic
Type: U — Network/User
Views: UK: 14 EN: 21 RU: 15
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Page language: EN

Causes

  • Faulty or failing ozone reduction catalyst temperature sensor
  • Open, shorted, or damaged wiring harness or connector at the sensor
  • Corroded or loose connector terminals or poor ground
  • Intermittent connection due to chaffing, water intrusion or heat damage
  • Bus communication errors (CAN/LIN) or high bus error rate
  • Faulty control module or module software/firmware error

Symptoms

  • Malfunction Indicator Lamp (MIL) or warning lamp illuminated
  • Emissions-related driveability or catalyst control warnings
  • Stored U0xxxx or related communication trouble codes
  • Failed readiness or emissions test
  • Possible reduced engine performance if the vehicle goes to a derate mode
  • Intermittent operation or warnings that may come and go

What to check

  • Read and record freeze frame and full PID/message data with a capable scan tool
  • Check for other related U-codes or network communication codes (CAN/LIN)
  • Visually inspect sensor and wiring for damage, chafing, water intrusion, or corrosion
  • Verify connector seats and terminal condition; look for bent or pushed-out pins
  • Backprobe sensor connector and verify reference power, ground, and signal/communication lines
  • Perform wiggle test on harness while monitoring live data for intermittent changes

Signal parameters

  • Typical sensor analog signal range: ~0–5.0 V (varies by vehicle); expect stable, monotonic response to temperature
  • Typical temperature reporting range: approximately -40°C to +125°C (may vary by design)
  • If sensor is networked: periodic CAN/LIN messages at vehicle-specific rate (e.g., 5–20 Hz) with valid message ID and data length
  • No excessive bit errors or CRC failures on communication messages
  • Sensor resistance vs temperature (NTC/PTC) should change smoothly; no open/short readings on DVM

Diagnostic algorithm

  1. Use a professional scan tool to confirm U049E is active and capture freeze frame and live data for the sensor. Note related codes.
  2. Inspect the sensor connector and harness near the sensor for damage, corrosion, or water intrusion. Repair any physical damage.
  3. With ignition on (engine off) backprobe the sensor connector: verify reference power (if applicable), ground continuity, and the signal line behavior. Compare to manufacturer-specified values or typical ranges.
  4. Measure sensor resistance (if applicable) and compare to expected resistance vs temperature characteristics. Check for open or short circuits.
  5. If the sensor communicates over CAN/LIN, check bus voltages (nominal CAN ~2.5 V idle between CAN_H and CAN_L) and use a scope or bus analyzer to look for malformed frames, high error counts, or missing messages.
  6. Perform a wiggle test on harness and connectors while monitoring live data to detect intermittent faults. Repair or secure any suspect wiring.
  7. If wiring and connector tests pass, substitute a known-good sensor (or bench-test the sensor) to confirm whether the sensor itself is faulty.
  8. If a replacement sensor cures the issue, clear codes and road test to verify. If problem persists, trace wiring back to the module, check grounds and power supplies, and inspect module connectors.
  9. Check for any technical service bulletins (TSBs) or software updates for the control module; update module software if applicable.
  10. If all wiring and sensor tests are good and software is current, consider diagnosing or replacing the control module as a last step, following manufacturer procedures.

Likely causes

  • Sensor wiring shorted to power or ground, or open circuit
  • Connector corrosion causing intermittent or high-resistance contact
  • Sensor internal failure producing out-of-range voltage or non-responsive data
  • Faulty instrument/control module not correctly interpreting sensor message
  • Loss of termination or excessive noise on CAN/LIN network affecting messages

Fault status

⚠️ Status
Controller reports invalid or out-of-spec data from the direct ozone reduction catalyst temperature sensor — communication or sensor circuit fault detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 to 2.5 hours
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