2017 MG ZS: CAN Communication Fault – OEM Repair Guide

A CAN communication fault on a 2017 MG ZS usually indicates a network communication problem rather than a confirmed module failure. The challenge is determining whether the issue involves wiring, connectors, power supplies, grounding circuits, or a specific control module, making proper diagnostic information essential before repairs begin.

Symptoms

  • Multiple warning lights may appear on the dashboard at the same time.
  • Communication fault codes may be stored in several control modules.
  • A scan tool may be unable to communicate with one or more modules.
  • Fault codes return shortly after being cleared.
  • The vehicle may crank but fail to start.
  • Systems such as ABS, ESC, airbag, or power steering may display warnings.
  • Intermittent electrical faults may appear without an obvious cause.
  • Live data from certain modules may be unavailable.
  • The problem may worsen after battery replacement or a low-voltage event.
  • Central locking, windows, lighting, or other body functions may behave unexpectedly.
  • Multiple modules may report loss of communication faults.
  • The issue may appear intermittently before becoming permanent.

Possible Causes

A CAN communication fault means one or more modules on the vehicle network are unable to exchange information correctly. The fault does not automatically indicate a failed control module. Instead, it suggests a disruption somewhere within the vehicle’s communication network.

Common causes include low system voltage, battery or charging system problems, poor ground connections, blown fuses, damaged wiring, connector corrosion, CAN bus faults, or a module that is disrupting network communication. On the MG ZS platform, communication issues are often traced back to power supply faults, wiring problems, grounding issues, or module communication interruptions before a control module is identified as the root cause.

In New Zealand, coastal corrosion and moisture exposure can contribute to connector and ground-related communication problems. Proper testing should always be completed before replacing any module.

Is It Safe To Continue Driving?

Drive with Caution

The vehicle may remain drivable, but communication faults can affect multiple safety and control systems. Continued operation may result in additional warning lights, reduced functionality, or an eventual no-start condition.

Diagnosis

A CAN communication fault confirms that network communication has been disrupted, but it does not identify which component is responsible. The fault may involve wiring, connectors, power supplies, grounds, or one or more control modules.

Diagnosis typically requires network testing, voltage checks, module communication testing, and inspection of CAN wiring circuits. OEM repair information is valuable because it provides wiring diagrams, CAN network layouts, connector pinouts, module locations, fuse layouts, and diagnostic procedures needed to accurately isolate the fault.

Recommended Resources

1. OEM Service and Repair Manual

The OEM Service and Repair Manual provides the same diagnostic and repair procedures used by MG dealerships. It includes CAN network diagrams, wiring diagrams, connector views, module locations, fuse layouts, and diagnostic workflows needed to accurately diagnose communication faults.

Use the form below to order the OEM Service and Repair Manual that provides the same diagnostic and repair procedures used by MG dealerships.

2. Buy Replacement Parts

Need parts to complete the repair?

Use the form below to order parts that match your 2017 MG ZS and the repair being performed.