MG ZS (Gen2) ABS Module Fault

An ABS Module Fault indicates that the Anti-lock Braking System (ABS) control module has detected an internal malfunction or is unable to correctly monitor and control the vehicle’s anti-lock braking, Electronic Stability Control (ESC), and Traction Control System (TCS). The ABS module continuously communicates with the Engine Control Module (ECM), Transmission Control Module (TCM), Body Control Module (BCM), Electric Power Steering (EPS), and instrument cluster via the Controller Area Network (CAN Bus). A fault within the ABS module or its supporting circuits can disable multiple safety systems and trigger numerous warning indicators. 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
  • Traction Control (TCS) warning light
  • Hill Start Assist unavailable
  • Brake warning light illuminated
  • Cruise control disabled
  • Reduced vehicle stability functions
  • Multiple communication or ABS-related DTCs stored
  • Diagnostic scan tool reports ABS module faults

Possible Causes

  • Internal ABS control module failure
  • Faulty hydraulic control unit (HCU)
  • Low battery voltage
  • Charging system malfunction
  • Blown ABS fuse
  • Faulty ABS relay
  • Damaged ABS module wiring harness
  • Loose, corroded, or water-damaged connectors
  • CAN Bus communication fault
  • Software corruption requiring module reprogramming
  • Faulty wheel speed sensor causing repeated module errors
  • Poor module ground or power supply

Diagnosis

Diagnosis begins by performing a complete vehicle scan using a compatible diagnostic scan tool capable of communicating with the ABS module. All stored Diagnostic Trouble Codes (DTCs), freeze-frame data, and live data should be reviewed before clearing any faults. Battery voltage, charging system output, ABS module power supplies, fuses, relays, and ground circuits should be verified to ensure the module receives stable electrical power. The wiring harness and connectors should be inspected for corrosion, damaged terminals, loose connections, or signs of water ingress. If communication with the ABS module is available, live wheel speed sensor data, hydraulic pump operation, valve activation, and internal module status should be evaluated. Manufacturer diagnostic procedures may also include CAN Bus integrity testing, resistance measurements, software verification, module programming, actuator testing, and hydraulic control unit evaluation to determine whether the fault is electrical, hydraulic, software-related, or an internal module failure.

For vehicles operating in New Zealand, following OEM diagnostic procedures helps accurately distinguish between an internal ABS module failure, hydraulic control unit fault, wheel speed sensor issue, wiring problem, CAN Bus communication fault, or power supply problem before replacing costly components.

Accurately diagnosing this fault often requires manufacturer testing procedures, wiring diagrams, hydraulic brake system schematics, CAN Bus network diagrams, connector pinouts, ABS module power and ground specifications, wheel speed sensor testing procedures, hydraulic control unit diagnostics, software programming procedures, 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.