MG ZS (Gen2) ABS Light On

An ABS Light On condition indicates that the Anti-lock Braking System (ABS) Control Module has detected a fault within the ABS, Electronic Stability Control (ESC), Traction Control System (TCS), or a related component that affects braking system operation. When the ABS warning light illuminates, the conventional hydraulic braking system generally continues to function normally; however, anti-lock braking, stability control, traction control, hill start assist, and other integrated safety features may be disabled until the fault is repaired. The ABS Control Module continuously monitors wheel speed sensors, hydraulic control components, steering angle sensor, yaw rate sensor, brake pressure sensors, communication networks, and power supply circuits. Any abnormality can trigger the ABS warning light and store one or more Diagnostic Trouble Codes (DTCs). This fault applies to the MG ZS Gen2 (ZS11 platform), introduced from 2024 onwards.

Symptoms

  • ABS warning light illuminated
  • Electronic Stability Control (ESC) warning light illuminated
  • Traction Control System (TCS) warning light illuminated
  • Hill Start Assist warning message
  • Multiple chassis system warning lights
  • ABS unavailable during emergency braking
  • Stability control disabled
  • Traction control disabled
  • Cruise control may be disabled on some models
  • Audible warning chime
  • ABS-related Diagnostic Trouble Codes (DTCs) stored

Possible Causes

  • Faulty wheel speed sensor
  • Damaged wheel speed sensor wiring
  • Damaged encoder ring or reluctor ring
  • Faulty ABS Control Module
  • Hydraulic Control Unit (HCU) malfunction
  • Steering angle sensor fault
  • Yaw rate sensor fault
  • Brake pressure sensor fault
  • Low brake fluid level
  • Blown ABS fuse or faulty relay
  • Poor ABS module power supply or ground
  • CAN Bus communication fault
  • Damaged wiring harness or connectors
  • Weak vehicle battery or low system voltage
  • Internal ABS module software or hardware failure

Diagnosis

Diagnosis begins by confirming all stored Diagnostic Trouble Codes (DTCs) using a compatible diagnostic scan tool capable of communicating with the ABS, Electronic Stability Control (ESC), Engine Control Module (ECM), Body Control Module (BCM), Electric Power Steering (EPS), and other related control modules. Freeze-frame and live data should be reviewed to identify the operating conditions present when the fault occurred. Live wheel speed data should be compared for all four wheels while driving to identify missing or erratic sensor signals. The technician should inspect wheel speed sensors, encoder rings, reluctor rings, wiring harnesses, connectors, ABS fuses, relays, power supply circuits, and ground connections for damage, corrosion, loose terminals, or water intrusion. The brake fluid level and hydraulic braking system should also be inspected. Steering angle sensor calibration, yaw rate sensor operation, brake pressure sensor data, and CAN Bus communication integrity should be verified where applicable. Circuit continuity, voltage drop, insulation integrity, and resistance testing should be performed to identify electrical faults. Manufacturer diagnostic procedures may also include ABS actuator tests, hydraulic pump testing, module communication testing, oscilloscope waveform analysis, calibration procedures, software verification, and module programming where required.

For vehicles operating in New Zealand, following OEM diagnostic procedures helps accurately distinguish between a faulty wheel speed sensor, ABS control module failure, hydraulic unit problem, steering angle sensor fault, brake pressure sensor issue, CAN Bus communication fault, wiring defect, or low voltage condition before replacing expensive braking system components.

Accurately diagnosing this fault often requires manufacturer testing procedures, wiring diagrams, ABS hydraulic system schematics, connector pinouts, wheel speed sensor specifications, steering angle sensor calibration procedures, brake pressure sensor testing procedures, CAN Bus network diagrams, ABS actuator test routines, oscilloscope waveform examples, live data reference values, software calibration files, and system calibration information. Access to the factory service manual significantly reduces diagnostic time and helps prevent unnecessary parts replacement.

Applicable Years

2024, 2025, 2026, onwards

To order the correct OEM Service and Repair Manual for your MG ZS, submit your request using the form below, and our team will provide the ordering details.