Code
C1230
HYUNDAI
C — Chassis
Pressure Sensor | Pressure sensor | Signal Yaw Rate or Acceleration AX or Acceleration AY or Brakepressure State not valid
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EN: 20
RU: 11
AI status
Completed
Completed
100%
Causes
- Faulty yaw rate (gyroscope) sensor
- Faulty acceleration sensor (AX/AY)
- Faulty brake pressure sensor or switch
- Open/short or poor connection in sensor signal, power or ground wiring
- Corroded/contaminated connector or water ingress
- Intermittent CAN/bus communication or ECU fault
Symptoms
- ABS and/or ESC/Traction Control warning lamp illuminated
- Loss of ESC/ABS/Traction Control functionality or partial functionality
- Brake performance may feel normal but stability aids disabled
- Stored fault code and possible freeze-frame data available
- Inconsistent sensor values on live-data (e.g., yaw/accel not responding to steering/motion)
What to check
- Read and record all related DTCs and freeze-frame data with a capable scan tool
- Check live data for yaw rate, AX/AY acceleration and brake pressure state while stationary and during a short road test
- Visually inspect sensor connectors and wiring for corrosion, damage, pin push-out or water ingress
- Verify proper battery voltage and good ground connections at sensors and control module
- Backprobe sensor power, ground and signal lines; check voltages and continuity
- Wiggle harness while observing live data to reproduce intermittent faults
Signal parameters
- Yaw rate sensor: output in degrees/sec (should be ~0 deg/s when stationary and change smoothly with steering input); signal typically varies around a reference voltage and should not be stuck
- Acceleration AX/AY: lateral/longitudinal acceleration should be ~0 m/s² at rest and change with vehicle motion; values should be plausible and consistent with vehicle maneuvers
- Brake pressure state: switch or pressure sensor should report OFF/low at rest and change to ON/higher when brake pedal is applied; pressure sensors report increasing pressure proportionally
- Typical sensor electrical: supply often 5 V (or vehicle reference) with sensor signal in the range ~0.1–4.9 V (manufacturer-specific). Check exact values in factory data
Diagnostic algorithm
- Retrieve all stored and pending codes (ABS/ESC and network U-codes). Note freeze-frame data and any related events.
- Clear codes and perform a controlled road test while monitoring live yaw, AX/AY and brake pressure signals to reproduce the fault.
- If fault returns, identify which signal is implausible (stuck, noisy, out of range or missing).
- Visually inspect associated sensor(s) and harness. Repair damaged wiring or connectors as needed.
- Backprobe sensor power and ground; confirm correct reference voltage and stable ground at rest and during operation.
- Probe sensor signal output while operating (steer vehicle, accelerate/brake) and compare to expected behavior. If signal missing or invalid, suspect sensor or wiring.
- Check CAN/bus connectivity and module communications; resolve any communication errors first (U-codes).
- If wiring and power/ground are good but signal invalid, replace the suspect sensor(s). After replacement, clear codes and perform relearn/calibration procedures if required by manufacturer.
- If problems persist after sensor replacement, consider replacing or reprogramming the ABS/ESC control module per manufacturer procedure.
- Final verify: clear codes, perform road test, confirm stable, plausible live data and that warning lamps stay off.
Likely causes
- Yaw rate sensor output out of range or no output
- Sensor connector contaminated or pin loose causing intermittent signal
- Shared power/ground supply missing or low (low battery or poor ground)
- Brake pressure switch reporting incorrect state (stuck or shorted)
- Module lost valid CAN data from sensor module
Fault status
Status
Invalid or implausible signal from yaw rate, acceleration (AX/AY) or brake pressure sensor detected — ESC/ABS system may be disabled until condition is corrected.
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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