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Home / DTC / C1230 — Pressure Sensor | Pressure sensor | Signal Yaw Rate or Acceleration AX or Acceleration AY or Brakepressure State not valid

C1230 — Pressure Sensor | Pressure sensor | Signal Yaw Rate or Acceleration AX or Acceleration AY or Brakepressure State not valid

Detailed page for trouble code C1230.

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C1230

HYUNDAI C — Chassis

Pressure Sensor | Pressure sensor | Signal Yaw Rate or Acceleration AX or Acceleration AY or Brakepressure State not valid

Brand: HYUNDAI
Type: C — Chassis
Views: UK: 11 EN: 19 RU: 9
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. Retrieve all stored and pending codes (ABS/ESC and network U-codes). Note freeze-frame data and any related events.
  2. Clear codes and perform a controlled road test while monitoring live yaw, AX/AY and brake pressure signals to reproduce the fault.
  3. If fault returns, identify which signal is implausible (stuck, noisy, out of range or missing).
  4. Visually inspect associated sensor(s) and harness. Repair damaged wiring or connectors as needed.
  5. Backprobe sensor power and ground; confirm correct reference voltage and stable ground at rest and during operation.
  6. Probe sensor signal output while operating (steer vehicle, accelerate/brake) and compare to expected behavior. If signal missing or invalid, suspect sensor or wiring.
  7. Check CAN/bus connectivity and module communications; resolve any communication errors first (U-codes).
  8. 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.
  9. If problems persist after sensor replacement, consider replacing or reprogramming the ABS/ESC control module per manufacturer procedure.
  10. 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

Similar codes

C1231 C1235 C1251 C0241 C0035 U0121
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Code

C1230

Other C — Chassis

Speed Wheel Sensor Rear Center Input Circuit Failure

Brand: Other
Type: C — Chassis
Views: UK: 19 EN: 34 RU: 15
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. Retrieve all stored and pending codes (ABS/ESC and network U-codes). Note freeze-frame data and any related events.
  2. Clear codes and perform a controlled road test while monitoring live yaw, AX/AY and brake pressure signals to reproduce the fault.
  3. If fault returns, identify which signal is implausible (stuck, noisy, out of range or missing).
  4. Visually inspect associated sensor(s) and harness. Repair damaged wiring or connectors as needed.
  5. Backprobe sensor power and ground; confirm correct reference voltage and stable ground at rest and during operation.
  6. Probe sensor signal output while operating (steer vehicle, accelerate/brake) and compare to expected behavior. If signal missing or invalid, suspect sensor or wiring.
  7. Check CAN/bus connectivity and module communications; resolve any communication errors first (U-codes).
  8. 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.
  9. If problems persist after sensor replacement, consider replacing or reprogramming the ABS/ESC control module per manufacturer procedure.
  10. 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

Similar codes

C1231 C1235 C1251 C0241 C0035 U0121
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