Code
B123C
LAND ROVER
B — Body
Traction control lamp / dynamic stability control
Views:
UK: 3
EN: 9
RU: 4
AI status
Completed
Completed
100%
Causes
- Faulty wheel speed (ABS) sensor or sensor ring
- Yaw rate/roll/accelerometer (stability) sensor fault or miscalibration
- Steering angle sensor fault or incorrect alignment
- ABS/DSC control module internal fault or software error
- CAN bus or wiring/connectors fault causing loss of communication between modules
- Low or unstable battery/charging system voltage
Symptoms
- Traction control / DSC warning lamp illuminated on dash
- ABS warning lamp may also be lit
- Traction control interventions unavailable or disabled
- Possible reduction in engine power or limp-home behavior during some faults
- Vehicle stability functions (ESC, rollover mitigation) not operating
- Stored fault codes and freeze-frame data present in modules
What to check
- Read all stored codes and freeze-frame data from ABS, engine, and body modules with a full-featured scan tool
- Check battery voltage and charging system (should be ~12.4–14.5 V under test conditions)
- Inspect fuses and relays related to ABS/DSC and power/gnd connections
- Visually inspect wheel speed sensors, tone rings, and associated wiring for damage or contamination
- Check steering angle sensor alignment and calibration values with scan tool
- Verify CAN bus and communication status between ABS/DSC, ECU and body control modules
Signal parameters
- Battery voltage: 12.0–14.5 V (key on / running)
- Wheel speed sensors: consistent and matching wheel speeds at each corner during slow roll
- Yaw rate (deg/s): ~0 deg/s when traveling straight; responds proportionally during turns
- Lateral/longitudinal acceleration: near 0 when stationary; varies with vehicle motion
- Steering angle sensor: ~0° when wheels are straight; relative changes match steering input
- ABS module CAN status: module should show active communication with other control units
Diagnostic algorithm
- Connect manufacturer-capable scan tool, read and record all DTCs and freeze-frame data from ABS, engine and body modules.
- Verify battery and charging voltage; ensure battery state is adequate. Clear any low-voltage related codes and retest.
- Inspect fuses/relays and power/ground to ABS/DSC module. Repair any faults.
- Visually inspect wheel speed sensors, tone rings and harnesses at all four wheels; repair or replace damaged components.
- Use live-data to compare wheel speed sensors while slowly driving or rotating wheels; identify faulty sensor(s) showing no or erratic signal.
- Check steering angle sensor and yaw-rate sensor data; if values are incorrect, perform sensor calibration as per manufacturer procedure.
- Check CAN bus communication lines for continuity, short to battery/ground, and proper termination. Repair wiring/connectors as needed.
- If module communication or internal faults are present, check for available software updates or known service bulletins; reflash or replace module if required.
- After repairs, clear codes, perform required calibrations (steering angle, yaw-rate), and road-test to confirm fault does not return.
- If fault is intermittent, use extended logging or oscilloscope on suspect circuits while driving to capture intermittent failures.
Likely causes
- Corroded or damaged wheel speed sensor connector or wiring harness
- Sensor contaminated (metal debris, brake dust) or magnet ring damaged
- Yaw rate sensor calibration lost after battery disconnect, suspension work or impact
- Module memory/firmware error needing reflash or replacement
- Intermittent CAN-L/CAN-H open, short, or high resistance
- Insufficient battery voltage during self-test causing stored fault
Fault status
Status
Traction control / Dynamic Stability Control lamp illuminated; stability control interventions may be disabled. Further diagnostics required to restore full function.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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