IsItAGoodCar
Reliability Guide

Common Problems with the
2017–2019 MG GS

We've identified 3 known issues that can affect the 2017–2019 MG GS. None are considered critical, but they're worth knowing about before you buy.

3
Known Issues
0
Serious
2
Moderate
1
Minor

All Known Issues

7-Speed Dual-Clutch Transmission (DCT) Low-Speed Shudder and Clutch Judder

ModerateGearbox & Transmission

The optional 7-speed dry dual-clutch automatic transmission exhibits noticeable clutch judder, hesitation, and jerky power delivery when crawling at low speeds in heavy UK urban traffic. Thermal build-up in stop-and-go driving accelerates clutch friction plate wear and glazes the clutch surfaces, leading to severe vibrations when pulling away from junctions or ascending moderate inclines until the TCU is updated or the clutch pack is replaced.

Est. Repair Cost: £450–£1,400
Warning Signs:

Shuddering and violent vibration when pulling away in first gear, Delayed throttle response and sudden surging at mini-roundabouts, Clutch overheat warning light illuminating during crawling traffic

What to Inspect:
  • Drive the vehicle slowly at 2–5 mph in stop-start traffic to feel for transmission shudder
  • Check dealer service paperwork for dual-clutch fluid service and transmission software reflash history
Verified by IsItAGoodCar Research TeamUpdated

Rear Brake Caliper Slider Pin Corrosion and Pad Binding

ModerateBrakes

The rear brake caliper guide pins and slide rails suffer from dirt ingress and corrosion caused by exposure to winter road salt in the UK. Seized guide pins prevent the brake pads from retracting cleanly from the brake discs, creating continuous drag, excessive rear wheel heat, accelerated pad wear, and an uneven braking balance that results in an MOT failure for brake imbalance or binding.

Est. Repair Cost: £180–£450
Warning Signs:

Hot rear alloy wheels and acrid burning smell after normal driving, Continuous high-pitched squealing from the rear axle while moving, Significant accumulation of black brake dust on rear alloy rims compared to front

What to Inspect:
  • Check temperature of rear wheel hubs by hand immediately after the test drive
  • Inspect rear brake discs for circular scoring grooves, excessive lip, or blue heat marks
Verified by IsItAGoodCar Research TeamUpdated

Tailgate Boot Lock Actuator Failure and Remote Unlatching Fault

MinorBodywork & Rust

The electronic tailgate latch solenoid and exterior microswitch mechanism suffer from moisture ingress through the rear hatch handle gasket. Internal electrical corrosion causes the latch actuator to fail intermittently or permanently, preventing the boot from opening via the key fob remote or tailgate exterior release button, trapping cargo inside the luggage area until the actuator unit is dismantled and replaced.

Est. Repair Cost: £120–£280
Warning Signs:

Tailgate fails to release when pressing key fob boot button, Exterior boot release switch clicks repeatedly without unlocking latch, Boot open warning light illuminates on dashboard while tailgate is securely shut

What to Inspect:
  • Operate tailgate release repeatedly using both the key fob remote and the handle switch
  • Inspect the boot lock striker plate and latch mechanism for rust or water stains
Verified by IsItAGoodCar Research TeamUpdated

Buying Tips for 2017–2019 MG GS

  • On DCT automatic models, conduct a rigorous low-speed test drive in stop-start traffic to detect clutch shudder.
  • Inspect the rear brake discs and calipers after driving to ensure guide pins are not binding or dragging.
  • Operate the tailgate release switch and key fob remote multiple times to ensure the latch solenoid opens reliably.
  • Check front headlamp units for internal water droplet pooling or misting along the bottom LED reflector housing.
  • Verify that all annual service stamps are present in the service book to confirm scheduled oil and brake fluid changes.