Code
C1294
HYUNDAI
C — Chassis
Wheel Acceleration sensor front-RH
Views:
UK: 17
EN: 24
RU: 16
AI status
Completed
Completed
100%
Causes
- Damaged or faulty front right wheel acceleration/speed sensor
- Open, shorted, corroded or disconnected wiring/connector at the front right sensor
- Contaminated or corroded connector pins (water, salt, grease)
- Damaged or missing tone ring/reluctor or excessive air gap
- Faulty ABS/ESC control module or intermittent module connector
- Wheel bearing damage or excessive play affecting the sensor signal
Symptoms
- ABS warning lamp illuminated
- ESC/TC (stability/traction) warning light illuminated or flashing
- Reduced or disabled ABS/ESC functionality during braking or cornering
- Possible pulsating brake pedal or altered ABS behavior under braking
- Stored DTC(s) related to wheel speed/acceleration sensor
What to check
- Read stored DTCs and freeze frame data with a capable scan tool; record related codes
- Compare live wheel speed/acceleration data for all four wheels at rest and during slow wheel rotation/road test
- Visually inspect front right wheel sensor, tone ring/reluctor and wiring for damage, corrosion, or contamination
- Check connector mating surfaces for corrosion, bent pins, or moisture
- Back-probe sensor connector and check for proper reference voltage, signal and ground per vehicle service manual
- Wiggle harness while monitoring live data to find intermittent faults
Signal parameters
- Sensor output should produce a pulsed (wheel speed) or variable voltage signal that changes with wheel rotation — compare waveform to opposite wheel
- Hall-effect/active sensors typically use a 5 V reference or 12 V supply and return a square/pulsed signal; at rest expect steady voltage, during rotation expect a pulsed waveform
- Passive (variable reluctance) sensors produce an AC sine/alternating voltage whose amplitude and frequency increase with speed
- Look for: no signal, constant voltage (stuck), excessive noise/spikes, or frequency inconsistent with wheel speed
Diagnostic algorithm
- Connect a scan tool, read and record C1294 and any related codes; note freeze frame and live wheel speed data.
- Visually inspect front right wheel area: sensor, connector, tone ring, and wiring for damage, contamination, or missing teeth.
- With ignition ON, back-probe the sensor connector and verify reference power and ground (if applicable) per service manual.
- Spin the front right wheel (wheel raised safely on lift) and monitor live waveform with a scan tool or oscilloscope; compare waveform and frequency to the opposite (good) wheel.
- Perform a wiggle test on the harness while monitoring live data for intermittent faults.
- If no supply or ground, trace and repair open/short in wiring; if supply present but no/abnormal signal, replace the wheel sensor.
- If sensor output is normal but module still flags C1294, inspect tone ring condition and air gap; repair or replace tone ring or hub assembly as needed.
- After repair replace/repair components, clear DTCs, and perform road test to confirm proper operation and that code does not return.
Likely causes
- Connector corrosion or loose terminal at front right wheel sensor
- Broken wiring harness near wheel (flex area)
- Failed wheel acceleration/speed sensor
- Damaged tone ring or magnetic debris on tone ring
Fault status
Status
Front right wheel acceleration/speed sensor signal abnormal. ABS/ESC functions may be limited or disabled until the fault is corrected.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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