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Home / DTC / C2711 — In Line Test Failure-Not found Lane Change

C2711 — In Line Test Failure-Not found Lane Change

Detailed page for trouble code C2711.

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C2711

HYUNDAI C — Chassis

In Line Test Failure-Not found Lane Change

Brand: HYUNDAI
Type: C — Chassis
Views: UK: 19 EN: 20 RU: 15
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Page language: EN

Causes

  • Faulty or misaligned radar/side sensors (blind-spot/side radar)
  • Faulty steering angle, yaw rate, or lateral accelerometer sensor
  • Turn signal or lane change request signal not reaching the control module
  • CAN bus or wiring fault between sensors and lane-change control module
  • Module software/firmware error or missing calibration
  • Intermittent sensor power or ground

Symptoms

  • Lane Change Assist / Blind-Spot indicators may not activate or may flash
  • Related ADAS warnings on the dash (Lane Assist/Blind-Spot/Check Surroundings)
  • Turn signal may function but lane change function is not recognized
  • Diagnostic trouble codes stored for lane-change or sensor communications
  • Occasional loss of stabilization/ESC assistance messages (if linked)

What to check

  • Read and record all stored codes and freeze frame data from all ADAS, ABS and BCM modules
  • Inspect connectors and wiring for side radar, steering angle sensor, and multifunction switch
  • Check for TSBs or software updates for lane-change/blind-spot module
  • Perform visual inspection of sensor surfaces and mounting/aiming
  • Verify turn signal input and indicator operation at the module (use scan tool/oscilloscope)
  • Confirm vehicle calibration status for steering angle and ADAS sensors

Signal parameters

  • Side radar CAN messages: present and periodic (typical 5–20 Hz depending on system)
  • Steering angle sensor: plausible angle values and no implausible jumps; center offset within calibration spec
  • Yaw rate and lateral acceleration: small steady values when driving straight; responsive during deliberate lane change
  • Turn signal input: on/off logic signal correlated with indicator activation
  • Power/ground at radar and ADAS modules: steady battery voltage (approx. 11–14 V) and good ground continuity
  • No repeated CAN error counters or bus-off conditions in related modules

Diagnostic algorithm

  1. Retrieve freeze frame and full DTC list from all related modules (ADAS, ABS, BCM). Note any communication U-codes.
  2. Attempt to re-create the condition: perform controlled lane-change maneuvers on a safe, low-traffic road while monitoring live data (steering angle, yaw, lateral accel, side radar messages, turn signal status).
  3. Inspect wiring and connectors for side radars, steering angle sensor, and multifunction switch. Repair any damage/corrosion and secure connectors.
  4. Use a scan tool to monitor the presence and frequency of radar/side sensor CAN messages. If messages are missing, isolate back to the sensor (power/ground/CAN).
  5. Verify steering angle calibration. If steering angle is out of center or uncalibrated, perform required calibration per service manual and re-test.
  6. Clean or realign sensors if contamination or misalignment is found; follow manufacturer aiming/calibration procedures after replacement or adjustment.
  7. If wiring and sensors check good but module still reports failure, check for software updates or reflash the module per Hyundai service procedures.
  8. Clear codes and perform a road test to confirm the event no longer occurs. If intermittent, capture live logs while driving to assist troubleshooting.
  9. If needed, replace the faulty sensor or control module as identified by diagnostic evidence, then perform required calibrations and retest.

Likely causes

  • Damaged side radar connector or harness (corrosion, broken pins)
  • Failed steering angle sensor or incorrect steering angle offset calibration
  • Open/short in turn signal input circuit or faulty multifunction switch
  • Loss of CAN messages from radar/AD sensors in the lane-change assist network
  • Control module software watchdog or self-test failing (requires reprogram/reflash)
  • Physical obstruction on sensor face or sensor misalignment after collision/repair

Fault status

⚠️ Status
In Line Test Failure - Lane change event not detected (lane-change assist/side radar self-test failure)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

C2710 C2712 C2720 C1201 U0121 U0415
84

Browse 84 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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