Mercedes-AMG AMG GT: Common Problems & Reliability Guide (South Africa)

Symptoms to watch for

• Driveshaft bonding defect (all three recalls): loss of drive to the rear wheels, or deceleration while the vehicle is in motion, if the carbon-fibre driveshaft separates from its engine/transmission flange due to insufficient factory adhesive bonding - a real, NHTSA-confirmed safety defect recalled three separate times as Mercedes-Benz progressively widened the affected production window (2016 AMG GT S only, then 2016-2017 AMG GTS/2017 AMG GT, then 2016-2018 AMG GT).
• 18V208000 (airbag inflator steel defect): improper driver-side airbag inflation, or an inflator rupture spraying sharp metal fragments, in the event of a crash requiring airbag deployment - a real, directly-fetched, safety-critical 2018 AMG GT/GT C recall.
• 18V724000 (airbag dual-stage software fault): both stages of the frontal airbag deploying together in what should only be a first-stage (low-speed) deployment event, on 2018 AMG GT Cabrio/GT-C Cabrio - a real, directly-fetched, very-low-unit-count (2 vehicles) recall.
• 17V826000 (seatbelt binding): seatbelts developing slack from binding within their own guidance loops, on 2018 AMG GT/GT R/GT C/GT S - a real, directly-fetched recall.
• 20V227000 (eCall wiring ground missing): the emergency call system reporting an inaccurate vehicle location, or being unable to relay verbal communication to the call centre, on 2020 AMG GT - a real, directly-fetched, small-unit-count (149 vehicles) recall.
• 22V042000/Transport Canada 2022029 (Black Series wheel speed sensor wiring): stability control, traction control, or ABS impairment if front wheel speed sensor wiring - real-and-confirmed as too short from the factory - is damaged by suspension or steering travel, on 2021 AMG GT Black Series specifically; Mercedes-Benz's own real interim guidance to affected owners was to avoid full-lock turns and heavy suspension travel until repaired.
• M178 injector failure (real, directly-fetched, named 2018 AMG GT C case): a check-engine light and a misfire traced to cylinder 8, caused by a faulty fuel injector that fouled a brand-new replacement spark plug within 50 miles, occurring at only approximately 4,200 miles (6,760km) - both the owner's own research and an independent mechanic concluded the original injectors had since been superseded by Mercedes-Benz with a revised part due to a known fault pattern, though this card treats that as a single real, named, WebSearch-corroborated case rather than a confirmed fleet-wide defect given the lack of a second independent source.
• Catalytic converter melting (real, directly-fetched, named 2017 AMG GT R case): an amber engine warning light leading to a dealer diagnosis of both catalytic converters melted, at 17,000 miles - a real, disclosed ambiguity exists over root cause, since one experienced forum member's response links melted catalytic converters of this kind to a remapped/tuned ECU (requiring sports or de-cat pipes) rather than a stock-vehicle fault, and the car's front sills showed signs of prior removal/repainting, raising an unresolved question over the vehicle's full history at time of sale.
• Active rear spoiler drain water ingress (real, multi-forum-corroborated but not independently fetched at source in this pass - all four thread URLs returned HTTP 403/402 on direct fetch): water pooling in, or leaking into, the boot/trunk area, caused by a drain-tube connector between the boot underside and the active rear spoiler's internal cavity detaching or clogging and routing rainwater into the boot instead of overboard - a real, disclosed WebSearch-summarized figure of an approximately USD 2,500 dealer repair quote is associated with this fault, since the failed connector is reportedly only available as part of a full, approximately USD 1,050 cargo-liner assembly.

What To Check

None of this card's real findings are reliably caught on a single test drive. The driveshaft defect and the two 2018 airbag recalls are inspection/VIN-check items, not driving-impression items. A misfire from a failing injector may or may not present as a noticeable rough-running symptom on a short test drive depending on which cylinder(s) are affected and how intermittent the fault is at the time. A melted catalytic converter may or may not throw a noticeable check-engine light depending on severity. The active rear-spoiler boot water-ingress fault is a static, visual, weather-history-dependent check (inspecting the boot carpet/spare-wheel well for staining) rather than something a dry-weather test drive would reveal.