Code
C006B
Generic
C — Chassis
Stability System Active Too Long
Views:
UK: 18
EN: 26
RU: 19
AI status
Completed
Completed
100%
Causes
- Faulty wheel speed sensor or damaged sensor tone ring
- Yaw rate or lateral acceleration sensor fault or miscalibration
- Steering angle sensor out of range or not centered
- ABS/ESC hydraulic unit or pump running continuously
- Low brake fluid level, stuck caliper, or leaking hydraulic line
- Intermittent or lost communications on CAN/BUS to ABS/ESC module
Symptoms
- ESC or traction control warning lamp illuminated
- Driver may feel prolonged braking pulses or engine torque reduction
- Vehicle feels constantly correcting or pulling while driving
- Unusual ABS pump noise (running longer than normal)
- Reduced performance or limp/limited power modes on some vehicles
What to check
- Read and record all stored and pending codes and freeze-frame data from ABS/ESC and engine modules
- Check for permanent/active status and event counts for C006B
- Visually inspect wheel speed sensor wiring, connectors, and tone rings for damage or debris
- Measure and compare wheel speed sensor signals at each wheel while rolling vehicle
- Verify yaw rate, lateral accel, and steering angle sensor values and compare to measured steering/vehicle motion
- Check brake fluid level, inspect for leaking calipers or hoses and seized caliper slides
Signal parameters
- Wheel speed sensor frequency/voltage (Hz or Vpp) at each wheel
- Calculated vehicle speed vs individual wheel speeds (km/h or mph)
- Yaw rate sensor output (deg/s)
- Lateral acceleration (g)
- Steering angle sensor position (degrees) and steering wheel angle sensor status/offset
- Brake pressure sensor (bar or psi) or wheel brake pressure commands
Diagnostic algorithm
- Retrieve all related codes from ABS/ESC and engine modules; record freeze frame and clear codes.
- Perform a visual inspection of wheel speed sensors, tone rings, wiring harnesses and connectors; repair any physical damage.
- Check tire pressures and sizes; correct mismatches and re-test on dry pavement.
- With a diagnostic scan tool, monitor live data: wheel speeds, yaw rate, steering angle, brake pressure and ESC active flags while performing a controlled drive test to try to reproduce the condition.
- Compare yaw rate and lateral acceleration to calculated values from wheel speeds; if inconsistent, suspect yaw/steering sensors and perform sensor calibration/zeroing per manufacturer procedure.
- If wheel speed sensors show intermittent or no signal, backprobe and measure sensor waveform with oscilloscope or multimeter; replace faulty sensors or repair wiring as required.
- If ABS pump runs continuously or hydraulic pressures are abnormal, inspect for pressure leaks, stuck calipers or faulty valve block; bench-test or replace hydraulic control unit if confirmed.
- Check for CAN communication errors and module software updates; reflash/update ABS/ESC module software if an applicable service bulletin exists.
- After repairs, perform ABS/ESC module relearn/calibration procedures and verify the condition is resolved by clearing codes and completing a verification drive.
- If intermittent or unresolved, escalate to module bench-testing or specialist diagnostic equipment.
Likely causes
- One or more wheel speed sensors providing incorrect or noisy signals
- Yaw rate sensor drift or failed steering angle sensor requiring recalibration
- Hydraulic unit solenoid stuck or ABS pump running due to internal leak
- Wiring harness corrosion or connector fault at ABS/ESC module
- Vehicle running on significantly mismatched tires or low traction surfaces
Fault status
Status
Stability System Active Too Long — ESC/traction control has been intervening persistently; investigate sensors, braking hydraulics, tire condition, and module communications.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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