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Home / DTC / C1245 — Front Left(FL) Height Sensor Low | Wheel Speed Frequency Error

C1245 — Front Left(FL) Height Sensor Low | Wheel Speed Frequency Error

Detailed page for trouble code C1245.

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C1245

HYUNDAI C — Chassis

Front Left(FL) Height Sensor Low | Wheel Speed Frequency Error

Brand: HYUNDAI
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Front left height sensor harness damaged, disconnected or corroded connector
  • Front left height sensor failed (internal short/open)
  • Suspension height sensor mechanical linkage stuck, bent, or detached
  • Front left wheel speed sensor damaged, loose, or contaminated
  • ABS tone/ring (reluctor) missing, cracked, or contaminated on FL wheel hub
  • Open/short or intermittent wiring to the wheel speed sensor or ABS module

Symptoms

  • ABS, ESC and/or Traction Control warning lamp(s) illuminated
  • Vehicle stability or traction control systems disabled
  • Suspension air/height leveling warning or incorrect ride height indication
  • ABS braking performance affected (pulsation or no ABS operation in a panic stop)
  • Inconsistent or missing wheel speed reading in live data for FL wheel
  • Uneven ride height or FL corner sitting lower than other corners

What to check

  • Read and record all stored codes and freeze-frame data with a capable scan tool
  • Check live data: FL height sensor value and all four wheel speed sensors while stationary and while rolling slowly
  • Visually inspect FL height sensor, linkage and mount for damage or binding
  • Inspect FL wheel speed sensor and tone ring for damage, missing teeth, dirt or excessive air gap
  • Inspect connectors and wiring harnesses for corrosion, pin damage, loose clips, or chafing
  • Verify proper battery voltage and good chassis/engine grounds

Signal parameters

  • Front-left height sensor: typically a 0–5 V position/height signal or variable resistance; a "low" fault often means the voltage is near 0 V or below the expected threshold
  • Height sensor should change smoothly when suspension is moved (jack or cycle suspension); no change or stuck near 0 V indicates sensor/connection fault
  • Wheel speed sensor: outputs pulses/AC voltage or digital frequency that increases smoothly with vehicle speed; FL wheel should match other wheels in frequency at same speed
  • At very low vehicle speeds frequency may be low (
  • Compare FL wheel speed amplitude/frequency to other wheels — large differences indicate local wheel sensor/tone ring issue

Diagnostic algorithm

  1. Retrieve codes and live data. Note if multiple related codes present (height and wheel speed). Clear codes and attempt to re-create fault while monitoring live data.
  2. Visually inspect FL height sensor, linkages and mounting for obstructions, binding, broken clips or corrosion. Manually move linkage; confirm sensor output changes accordingly.
  3. Inspect FL wheel hub area: check speed sensor, mounting, tone ring (ABS reluctor) and air gap. Clean sensor and tone ring if contaminated.
  4. With ignition on (engine off), backprobe FL height sensor connector and measure voltage/resistance per service manual. Expect a 0–5 V signal that changes with link movement; replace sensor if open/short or no change.
  5. Road- or shop-test while logging wheel speed frequencies. Check for missing pulses, intermittent signal or low amplitude compared with other wheels.
  6. Check continuity and resistance of wiring from sensor to ABS module; repair any open/shorts, pin corrosion, or poor connectors. Check and repair grounds.
  7. If tone ring damaged or missing teeth, replace the hub/reluctor or assembly as required.
  8. If wiring and sensors test good, check power/ground to ABS/module and consider module fault. Reflash software only if recommended by manufacturer and after verifying sensors/wiring.
  9. After repair, clear codes and verify system relearns (if required) and that live data shows normal height and wheel speed signals under test conditions.

Likely causes

  • Corroded/flawed connector at FL height sensor or wheel speed sensor
  • Damaged/shorted sensor wiring due to rubbing, chafing or road debris
  • Failed FL height sensor (stuck, internal short) causing low voltage
  • Missing/damaged tone ring or excessive air gap at wheel speed sensor
  • Contaminated sensor surface (iron filings, mud) reducing signal
  • Loose mounting or incorrect sensor alignment/air gap

Fault status

⚠️ Status
Front Left height sensor low voltage or front left wheel speed frequency abnormal. ABS/ESC and ride height systems may be disabled; inspect FL height sensor, wheel speed sensor/tone ring, wiring and ABS module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours

Similar codes

C0035 C0040 C1246 C1250 C1234
371

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