Code
C0086
Generic
C — Chassis
Vehicle Dynamics Indicator
AI status
Completed
Completed
100%
Causes
- Faulty yaw-rate or lateral-acceleration sensor
- Faulty wheel speed sensor(s) or steering angle sensor
- Intermittent or open/shorted wiring or poor connector/ground to chassis or module
- Low vehicle battery voltage or poor power supply to the vehicle dynamics module
- CAN bus or communication errors between control modules
- Faulty vehicle dynamics/ESP/ABS control module or internal software fault
Symptoms
- ESP/ESC/Vehicle Dynamics warning lamp illuminated on dash
- Stability/traction control functions disabled or reduced (TCS off, limited ABS functionality)
- Intermittent loss of speed or yaw/steering data on scan tool
- Vehicle may show reduced engine torque or altered braking strategy during detected fault
- Related ABS or braking faults may be present
- Driveability usually unaffected until stability functions are required
What to check
- Read and record all stored and pending codes from ABS/ESP and engine control modules; note freeze-frame and occurrence count
- Inspect battery condition and charging system voltage (key on, engine off and running voltages)
- Visually inspect sensor connectors, wiring harnesses, and tone rings for damage, corrosion, pin push-out, or water ingress
- Check module and sensor grounds for tightness and corrosion at common chassis ground points
- Verify fuses and relays for the ABS/ESP module are intact and seated
- Use a scan tool to view live data for wheel speed, steering angle, yaw rate, lateral acceleration and compare sensors for plausibility and symmetry
Signal parameters
- Wheel speed sensors: pulse frequency or AC/Vpp that increases with wheel rotation; for active sensors 0–5 V square/sine signals at rest ~0 V and increasing with speed
- Steering angle sensor: near 0° with steering straight; values should change smoothly with steering input and not jump
- Yaw rate sensor: near 0°/s when driving straight; responds proportionally to vehicle rotation—values should not be noisy or pegged
- Lateral acceleration: small value near 0 g when straight; responds smoothly to cornering
- Vehicle speed (from ABS) should match speedometer/GPS closely (minor tolerance)
- CAN messages: expected periodic message rates (e.g., 10–100 Hz depending on vehicle) and valid node IDs for ABS/ESP modules
Diagnostic algorithm
- Step 1 — Scan and record: Connect a capable scan tool. Read all ABS/ESP and related module DTCs and freeze-frame data. Note any companion codes (wheel speed, yaw, steering angle, battery).
- Step 2 — Visual & power checks: Inspect fuses, relays, module connectors and wiring. Check battery voltage and charging system; verify power and ground at the vehicle dynamics module.
- Step 3 — Live-data plausibility: With the scan tool, monitor wheel speed sensors, steering angle, yaw rate and lateral accel. Look for missing, erratic, or implausible signals (e.g., one wheel speed stuck at zero, yaw pegged).
- Step 4 — Isolate sensor/wiring: If a specific sensor shows bad data, inspect its harness and connector. Wiggle-test wiring while watching live data to reproduce the fault. Measure sensor output with multimeter/oscilloscope as appropriate.
- Step 5 — Communication checks: Verify CAN bus connectivity and that the dynamics module is present and communicating. Check for bus errors or missing messages.
- Step 6 — Replace or re-calibrate: If a sensor is confirmed faulty, replace it and perform any required module calibrations/adaptations (steering angle zeroing, IMU calibration) using OEM procedures.
- Step 7 — Module troubleshooting: If sensors and wiring pass and communications/power are correct, consider reflashing or replacing the vehicle dynamics/ABS module per manufacturer guidance.
- Step 8 — Verification: Clear codes, perform a road test with live-data monitoring to ensure the fault does not recur and stability functions operate normally.
Likely causes
- Wheel speed sensor failure or damaged tone ring
- Steering angle sensor out-of-center or faulty
- Yaw rate/IMU sensor fault or bad mounting/ground
- Poor power/ground to the dynamics control module
- Damaged wiring/connector at sensors or module
Fault status
Status
Vehicle dynamics indicator fault detected. Stability/traction control may be disabled or limited until fault is resolved. Diagnostic trouble code stored in vehicle dynamics/ESP system.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
C0086
HYUNDAI
C — Chassis
Vehicle Dynamics Indicator (Subfault)
AI status
Completed
Completed
100%
Causes
- Faulty yaw-rate or lateral-acceleration sensor
- Faulty wheel speed sensor(s) or steering angle sensor
- Intermittent or open/shorted wiring or poor connector/ground to chassis or module
- Low vehicle battery voltage or poor power supply to the vehicle dynamics module
- CAN bus or communication errors between control modules
- Faulty vehicle dynamics/ESP/ABS control module or internal software fault
Symptoms
- ESP/ESC/Vehicle Dynamics warning lamp illuminated on dash
- Stability/traction control functions disabled or reduced (TCS off, limited ABS functionality)
- Intermittent loss of speed or yaw/steering data on scan tool
- Vehicle may show reduced engine torque or altered braking strategy during detected fault
- Related ABS or braking faults may be present
- Driveability usually unaffected until stability functions are required
What to check
- Read and record all stored and pending codes from ABS/ESP and engine control modules; note freeze-frame and occurrence count
- Inspect battery condition and charging system voltage (key on, engine off and running voltages)
- Visually inspect sensor connectors, wiring harnesses, and tone rings for damage, corrosion, pin push-out, or water ingress
- Check module and sensor grounds for tightness and corrosion at common chassis ground points
- Verify fuses and relays for the ABS/ESP module are intact and seated
- Use a scan tool to view live data for wheel speed, steering angle, yaw rate, lateral acceleration and compare sensors for plausibility and symmetry
Signal parameters
- Wheel speed sensors: pulse frequency or AC/Vpp that increases with wheel rotation; for active sensors 0–5 V square/sine signals at rest ~0 V and increasing with speed
- Steering angle sensor: near 0° with steering straight; values should change smoothly with steering input and not jump
- Yaw rate sensor: near 0°/s when driving straight; responds proportionally to vehicle rotation—values should not be noisy or pegged
- Lateral acceleration: small value near 0 g when straight; responds smoothly to cornering
- Vehicle speed (from ABS) should match speedometer/GPS closely (minor tolerance)
- CAN messages: expected periodic message rates (e.g., 10–100 Hz depending on vehicle) and valid node IDs for ABS/ESP modules
Diagnostic algorithm
- Step 1 — Scan and record: Connect a capable scan tool. Read all ABS/ESP and related module DTCs and freeze-frame data. Note any companion codes (wheel speed, yaw, steering angle, battery).
- Step 2 — Visual & power checks: Inspect fuses, relays, module connectors and wiring. Check battery voltage and charging system; verify power and ground at the vehicle dynamics module.
- Step 3 — Live-data plausibility: With the scan tool, monitor wheel speed sensors, steering angle, yaw rate and lateral accel. Look for missing, erratic, or implausible signals (e.g., one wheel speed stuck at zero, yaw pegged).
- Step 4 — Isolate sensor/wiring: If a specific sensor shows bad data, inspect its harness and connector. Wiggle-test wiring while watching live data to reproduce the fault. Measure sensor output with multimeter/oscilloscope as appropriate.
- Step 5 — Communication checks: Verify CAN bus connectivity and that the dynamics module is present and communicating. Check for bus errors or missing messages.
- Step 6 — Replace or re-calibrate: If a sensor is confirmed faulty, replace it and perform any required module calibrations/adaptations (steering angle zeroing, IMU calibration) using OEM procedures.
- Step 7 — Module troubleshooting: If sensors and wiring pass and communications/power are correct, consider reflashing or replacing the vehicle dynamics/ABS module per manufacturer guidance.
- Step 8 — Verification: Clear codes, perform a road test with live-data monitoring to ensure the fault does not recur and stability functions operate normally.
Likely causes
- Wheel speed sensor failure or damaged tone ring
- Steering angle sensor out-of-center or faulty
- Yaw rate/IMU sensor fault or bad mounting/ground
- Poor power/ground to the dynamics control module
- Damaged wiring/connector at sensors or module
Fault status
Status
Vehicle dynamics indicator fault detected. Stability/traction control may be disabled or limited until fault is resolved. Diagnostic trouble code stored in vehicle dynamics/ESP system.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for HYUNDAI
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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