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Home / DTC / C1251 — RSS Indicated Malfunction

C1251 — RSS Indicated Malfunction

Detailed page for trouble code C1251.

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Code

C1251

HUMMER C — Chassis

RSS Indicated Malfunction

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

Causes

  • Faulty yaw-rate or lateral-acceleration sensor
  • Faulty steering angle sensor or miscalibrated steering angle data
  • Open/short or poor connection in sensor wiring harness or connectors
  • Faulty ABS/ESP/RSS control module
  • Low or unstable battery/charging system voltage
  • CAN communication errors between modules

Symptoms

  • Traction control and/or stability control warning lights illuminated
  • “RSS Indicated” message on dash or driver information center
  • Reduced or disabled stability/traction control functions
  • ABS warning may also be present
  • Possible altered brake/engine torque intervention behavior during traction events

What to check

  • Read all stored and pending diagnostic trouble codes and freeze frame data with a capable scan tool
  • Check battery voltage with ignition on and during cranking (should be stable >11.5V)
  • Visually inspect sensor connectors and wiring for damage, corrosion, or loose pins (yaw, lateral accel, steering angle, wheel speed sensors)
  • Check fuses and ground connections related to ABS/RSS modules
  • Check for module communication faults (U-codes) on the CAN bus
  • Verify steering angle sensor is calibrated and returns reasonable values at center and full lock

Signal parameters

  • Yaw-rate sensor output: degrees/sec or digital counts (should change smoothly with yaw)
  • Lateral-accel sensor: g or m/s² values consistent with vehicle motion
  • Steering angle sensor: centered counts/angle and counts change when steering wheel turned
  • Wheel speed sensor pulses: present and consistent at all four wheels
  • Module supply voltage: ~11–14.5 V
  • CAN bus chatter: ABS/RSS messages present and valid

Diagnostic algorithm

  1. Connect a capable scan tool and record all codes, freeze frame and live data for ABS/RSS/yaw/accel/steering angle sensors.
  2. Note any communication (U0xxx) or other ABS-related codes; clear codes and see if C1251 returns immediately or after a drive cycle.
  3. Verify battery state of charge and charging system; charge or replace battery if low and retest.
  4. Perform visual inspection of wiring and connectors for yaw, lateral accel, steering angle and wheel speed sensors; repair any damage.
  5. Monitor live data: verify yaw and lateral accel sensors respond to vehicle rotation and lane/steering inputs; verify steering angle returns to center value.
  6. Check wheel speed sensor signals (oscilloscope or scan tool) for dropout or noise that could affect stability control.
  7. If steering angle is out of calibration, perform steering angle sensor reset/calibration per manufacturer procedure and clear codes.
  8. If a specific sensor shows out-of-range or no output, verify its supply and ground then replace sensor if fault confirmed.
  9. If wiring and sensors test good, check ABS/RSS module power, ground and CAN communication; perform module reflash or replacement only after verifying communications and inputs.
  10. After repairs, clear codes and perform road test with live data monitoring; confirm C1251 does not return and stability functions are restored.
  11. Perform any required module calibrations or relearns (steering angle, yaw sensor calibration) per service manual.

Likely causes

  • Yaw-rate or lateral-acceleration sensor failure
  • Corroded/loose connector or damaged wiring to RSS/ABS sensors
  • Steering angle sensor out of calibration after wheel alignment or steering repair
  • Loss of CAN communication to ABS/RSS module
  • Low battery voltage during self-test causing false fault

Fault status

⚠️ Status
RSS Indicated malfunction — stability control system has detected a fault and may be disabled. Diagnose sensors, wiring, and module communications before restoring service.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

C1201 C1250 C1252 C1256 U0121 C0035
Repair manuals

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Code

C1251

HYUNDAI C — Chassis

Rear Left(RL) Height Sensor | Height Sensor - Rear Left

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

Causes

  • Faulty yaw-rate or lateral-acceleration sensor
  • Faulty steering angle sensor or miscalibrated steering angle data
  • Open/short or poor connection in sensor wiring harness or connectors
  • Faulty ABS/ESP/RSS control module
  • Low or unstable battery/charging system voltage
  • CAN communication errors between modules

Symptoms

  • Traction control and/or stability control warning lights illuminated
  • “RSS Indicated” message on dash or driver information center
  • Reduced or disabled stability/traction control functions
  • ABS warning may also be present
  • Possible altered brake/engine torque intervention behavior during traction events

What to check

  • Read all stored and pending diagnostic trouble codes and freeze frame data with a capable scan tool
  • Check battery voltage with ignition on and during cranking (should be stable >11.5V)
  • Visually inspect sensor connectors and wiring for damage, corrosion, or loose pins (yaw, lateral accel, steering angle, wheel speed sensors)
  • Check fuses and ground connections related to ABS/RSS modules
  • Check for module communication faults (U-codes) on the CAN bus
  • Verify steering angle sensor is calibrated and returns reasonable values at center and full lock

Signal parameters

  • Yaw-rate sensor output: degrees/sec or digital counts (should change smoothly with yaw)
  • Lateral-accel sensor: g or m/s² values consistent with vehicle motion
  • Steering angle sensor: centered counts/angle and counts change when steering wheel turned
  • Wheel speed sensor pulses: present and consistent at all four wheels
  • Module supply voltage: ~11–14.5 V
  • CAN bus chatter: ABS/RSS messages present and valid

Diagnostic algorithm

  1. Connect a capable scan tool and record all codes, freeze frame and live data for ABS/RSS/yaw/accel/steering angle sensors.
  2. Note any communication (U0xxx) or other ABS-related codes; clear codes and see if C1251 returns immediately or after a drive cycle.
  3. Verify battery state of charge and charging system; charge or replace battery if low and retest.
  4. Perform visual inspection of wiring and connectors for yaw, lateral accel, steering angle and wheel speed sensors; repair any damage.
  5. Monitor live data: verify yaw and lateral accel sensors respond to vehicle rotation and lane/steering inputs; verify steering angle returns to center value.
  6. Check wheel speed sensor signals (oscilloscope or scan tool) for dropout or noise that could affect stability control.
  7. If steering angle is out of calibration, perform steering angle sensor reset/calibration per manufacturer procedure and clear codes.
  8. If a specific sensor shows out-of-range or no output, verify its supply and ground then replace sensor if fault confirmed.
  9. If wiring and sensors test good, check ABS/RSS module power, ground and CAN communication; perform module reflash or replacement only after verifying communications and inputs.
  10. After repairs, clear codes and perform road test with live data monitoring; confirm C1251 does not return and stability functions are restored.
  11. Perform any required module calibrations or relearns (steering angle, yaw sensor calibration) per service manual.

Likely causes

  • Yaw-rate or lateral-acceleration sensor failure
  • Corroded/loose connector or damaged wiring to RSS/ABS sensors
  • Steering angle sensor out of calibration after wheel alignment or steering repair
  • Loss of CAN communication to ABS/RSS module
  • Low battery voltage during self-test causing false fault

Fault status

⚠️ Status
RSS Indicated malfunction — stability control system has detected a fault and may be disabled. Diagnose sensors, wiring, and module communications before restoring service.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

C1201 C1250 C1252 C1256 U0121 C0035
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HYUNDAI

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Keep it short and practical. Up to 500 characters.
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Code

C1251

MITSUBISHI C — Chassis

RR outlet valve

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

Causes

  • Faulty yaw-rate or lateral-acceleration sensor
  • Faulty steering angle sensor or miscalibrated steering angle data
  • Open/short or poor connection in sensor wiring harness or connectors
  • Faulty ABS/ESP/RSS control module
  • Low or unstable battery/charging system voltage
  • CAN communication errors between modules

Symptoms

  • Traction control and/or stability control warning lights illuminated
  • “RSS Indicated” message on dash or driver information center
  • Reduced or disabled stability/traction control functions
  • ABS warning may also be present
  • Possible altered brake/engine torque intervention behavior during traction events

What to check

  • Read all stored and pending diagnostic trouble codes and freeze frame data with a capable scan tool
  • Check battery voltage with ignition on and during cranking (should be stable >11.5V)
  • Visually inspect sensor connectors and wiring for damage, corrosion, or loose pins (yaw, lateral accel, steering angle, wheel speed sensors)
  • Check fuses and ground connections related to ABS/RSS modules
  • Check for module communication faults (U-codes) on the CAN bus
  • Verify steering angle sensor is calibrated and returns reasonable values at center and full lock

Signal parameters

  • Yaw-rate sensor output: degrees/sec or digital counts (should change smoothly with yaw)
  • Lateral-accel sensor: g or m/s² values consistent with vehicle motion
  • Steering angle sensor: centered counts/angle and counts change when steering wheel turned
  • Wheel speed sensor pulses: present and consistent at all four wheels
  • Module supply voltage: ~11–14.5 V
  • CAN bus chatter: ABS/RSS messages present and valid

Diagnostic algorithm

  1. Connect a capable scan tool and record all codes, freeze frame and live data for ABS/RSS/yaw/accel/steering angle sensors.
  2. Note any communication (U0xxx) or other ABS-related codes; clear codes and see if C1251 returns immediately or after a drive cycle.
  3. Verify battery state of charge and charging system; charge or replace battery if low and retest.
  4. Perform visual inspection of wiring and connectors for yaw, lateral accel, steering angle and wheel speed sensors; repair any damage.
  5. Monitor live data: verify yaw and lateral accel sensors respond to vehicle rotation and lane/steering inputs; verify steering angle returns to center value.
  6. Check wheel speed sensor signals (oscilloscope or scan tool) for dropout or noise that could affect stability control.
  7. If steering angle is out of calibration, perform steering angle sensor reset/calibration per manufacturer procedure and clear codes.
  8. If a specific sensor shows out-of-range or no output, verify its supply and ground then replace sensor if fault confirmed.
  9. If wiring and sensors test good, check ABS/RSS module power, ground and CAN communication; perform module reflash or replacement only after verifying communications and inputs.
  10. After repairs, clear codes and perform road test with live data monitoring; confirm C1251 does not return and stability functions are restored.
  11. Perform any required module calibrations or relearns (steering angle, yaw sensor calibration) per service manual.

Likely causes

  • Yaw-rate or lateral-acceleration sensor failure
  • Corroded/loose connector or damaged wiring to RSS/ABS sensors
  • Steering angle sensor out of calibration after wheel alignment or steering repair
  • Loss of CAN communication to ABS/RSS module
  • Low battery voltage during self-test causing false fault

Fault status

⚠️ Status
RSS Indicated malfunction — stability control system has detected a fault and may be disabled. Diagnose sensors, wiring, and module communications before restoring service.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

C1201 C1250 C1252 C1256 U0121 C0035
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

C1251

Other C — Chassis

ABS Inlet Valve Coil LR Circuit Open

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

Causes

  • Faulty yaw-rate or lateral-acceleration sensor
  • Faulty steering angle sensor or miscalibrated steering angle data
  • Open/short or poor connection in sensor wiring harness or connectors
  • Faulty ABS/ESP/RSS control module
  • Low or unstable battery/charging system voltage
  • CAN communication errors between modules

Symptoms

  • Traction control and/or stability control warning lights illuminated
  • “RSS Indicated” message on dash or driver information center
  • Reduced or disabled stability/traction control functions
  • ABS warning may also be present
  • Possible altered brake/engine torque intervention behavior during traction events

What to check

  • Read all stored and pending diagnostic trouble codes and freeze frame data with a capable scan tool
  • Check battery voltage with ignition on and during cranking (should be stable >11.5V)
  • Visually inspect sensor connectors and wiring for damage, corrosion, or loose pins (yaw, lateral accel, steering angle, wheel speed sensors)
  • Check fuses and ground connections related to ABS/RSS modules
  • Check for module communication faults (U-codes) on the CAN bus
  • Verify steering angle sensor is calibrated and returns reasonable values at center and full lock

Signal parameters

  • Yaw-rate sensor output: degrees/sec or digital counts (should change smoothly with yaw)
  • Lateral-accel sensor: g or m/s² values consistent with vehicle motion
  • Steering angle sensor: centered counts/angle and counts change when steering wheel turned
  • Wheel speed sensor pulses: present and consistent at all four wheels
  • Module supply voltage: ~11–14.5 V
  • CAN bus chatter: ABS/RSS messages present and valid

Diagnostic algorithm

  1. Connect a capable scan tool and record all codes, freeze frame and live data for ABS/RSS/yaw/accel/steering angle sensors.
  2. Note any communication (U0xxx) or other ABS-related codes; clear codes and see if C1251 returns immediately or after a drive cycle.
  3. Verify battery state of charge and charging system; charge or replace battery if low and retest.
  4. Perform visual inspection of wiring and connectors for yaw, lateral accel, steering angle and wheel speed sensors; repair any damage.
  5. Monitor live data: verify yaw and lateral accel sensors respond to vehicle rotation and lane/steering inputs; verify steering angle returns to center value.
  6. Check wheel speed sensor signals (oscilloscope or scan tool) for dropout or noise that could affect stability control.
  7. If steering angle is out of calibration, perform steering angle sensor reset/calibration per manufacturer procedure and clear codes.
  8. If a specific sensor shows out-of-range or no output, verify its supply and ground then replace sensor if fault confirmed.
  9. If wiring and sensors test good, check ABS/RSS module power, ground and CAN communication; perform module reflash or replacement only after verifying communications and inputs.
  10. After repairs, clear codes and perform road test with live data monitoring; confirm C1251 does not return and stability functions are restored.
  11. Perform any required module calibrations or relearns (steering angle, yaw sensor calibration) per service manual.

Likely causes

  • Yaw-rate or lateral-acceleration sensor failure
  • Corroded/loose connector or damaged wiring to RSS/ABS sensors
  • Steering angle sensor out of calibration after wheel alignment or steering repair
  • Loss of CAN communication to ABS/RSS module
  • Low battery voltage during self-test causing false fault

Fault status

⚠️ Status
RSS Indicated malfunction — stability control system has detected a fault and may be disabled. Diagnose sensors, wiring, and module communications before restoring service.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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C1201 C1250 C1252 C1256 U0121 C0035
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