The 2019 AMG GT with its hand-built M177/M178 4.0L twin-turbo V8 is a high-strung performance car that demands meticulous maintenance. Early examples have shown catastrophic engine failures due to oiling issues and rod bearing wear, while transmission cooler leaks and software glitches are common annoyances.
Connecting Rod Bearing Failure (M177/M178 Engine)
Occasional · high severity
Typical onset: 30,000-60,000 mi
Symptoms: Metallic knocking noise from engine bay, especially cold start or under load, Oil pressure fluctuations or warning light, Metal shavings in oil filter during routine oil change, Sudden catastrophic failure with complete engine seizure
Fix: This is the nightmare scenario: requires complete engine-out teardown, crankshaft inspection/grinding, new bearings, often new pistons and rings. If rods are scored, you're looking at short block replacement or full rebuild. 40-60 hours labor depending on damage extent. Mercedes extended warranty to 10yr/120k mi on some VINs but not all 2019s qualify.
Estimated cost: $15,000-35,000
Transmission Oil Cooler Leak
Common · medium severity
Typical onset: 40,000-80,000 mi
Symptoms: Transmission fluid puddle under car, driver side front area, Burnt transmission fluid smell after spirited driving, Transmission temperature warning on dash, Harsh shifting or delayed engagement when fluid level drops
Fix: The DCT cooler lines and cooler itself crack from heat cycling. Requires front undertray removal, draining trans fluid, replacing cooler assembly and lines. 4-6 hours labor, plus factory DCT fluid refill and adaptation procedure with XENTRY diagnostics.
Estimated cost: $1,800-2,800
Transmission Mount Failure
Common · medium severity
Typical onset: 50,000-90,000 mi
Symptoms: Loud clunk when shifting from Park to Drive or Reverse, Vibration through cabin at idle or during aggressive acceleration, Visible transmission sag when inspecting from underneath, Knocking noise over bumps from driveline area
Fix: The rear transmission mount (hydraulic type) tears internally from the DCT's violent shifts. Requires lifting transmission slightly with jack, removing old mount, pressing in new OEM unit. 3-4 hours labor. Aftermarket units exist but OEM recommended for proper NVH control.
Estimated cost: $1,200-1,800
Fuel Filter/High Pressure Fuel Pump Contamination
Occasional · high severity
Symptoms: Sudden loss of power, limp mode activation, Check engine light with fuel pressure fault codes (P0087, P0088), Rough idle or misfires under boost, Long crank time or no-start condition
Fix: The high-pressure direct injection system is sensitive to fuel contamination. Fuel filter located in tank requires tank drop. If pump is contaminated, both pumps (low and high pressure) plus injectors may need cleaning or replacement. Tank drop and reinstall 6-8 hours, plus injector service if needed. Always use Top Tier fuel.
Estimated cost: $2,000-5,000
Head Gasket Failure (Overheating-Related)
Rare · high severity
Typical onset: 60,000-100,000 mi
Symptoms: White smoke from exhaust on cold start, Coolant loss with no visible leaks, Oil milky/frothy on dipstick or oil cap, Rough idle and misfires, coolant smell from exhaust
Fix: Usually follows overheating event (track use, coolant leak ignored). Requires engine-out service, heads removed and resurfaced, new gaskets, ARP studs recommended. Check for warped heads. 50-70 hours labor. If cylinder walls are scored, you're into short block territory.
Estimated cost: $12,000-18,000
Electrical System Software Glitches (NHTSA Recalls)
Occasional · low severity
Symptoms: Infotainment system freezes or reboots randomly, Transmission fault messages with no actual mechanical issue, Intermittent loss of parking sensors or camera, Battery drain from modules not sleeping properly
Fix: Multiple NHTSA recalls for software updates to transmission control unit and body control modules. Dealer-only fix via XENTRY flash, 1-2 hours. Check if your VIN has open recalls. Independent shops cannot perform Mercedes software updates without dealer-level access.
Estimated cost: $0-300
Owner tips
Change engine oil every 5,000 miles (not the 10k interval) with MB 229.5 spec oil—rod bearings depend on it
Use only Top Tier gasoline to prevent fuel system contamination and carbon buildup on direct injection valves
Check transmission fluid level and condition every 20k miles; factory says lifetime fill but it's not
Inspect transmission cooler lines annually for seepage—catch leaks early before fluid gets critically low
Verify all NHTSA recalls completed before purchase; transmission software updates critical for longevity
Budget $3,000-5,000/year for maintenance beyond consumables if driven hard—these are hand-built race engines
Consider extended warranty or setting aside $10k emergency fund for potential engine work—rod bearing failures are not cheap
Buy one only if you have deep pockets and access to a Mercedes specialist—when they run, they're intoxicating, but the M177/M178 engine reliability issues make this a high-risk used purchase without warranty coverage.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: AGM battery required; located in engine compartment
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Every control module on the 2018-2023 Mercedes-Benz AMG GT — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Electric Power Steering Control Unit (EPS)3.5 hr R&Rsecurity gateway +1.2 hr▸ programming details
📍 Steering column, integrated with steering rack assembly
⚠️ Requires Mercedes me connect subscription activation after replacement.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2022 CLA-Class, GLA-Class, GLE-Class, GLS-Class, SLC-Class, A-Class, AMG GT-Class, C-Class, E-Class, S-Class, SL-Class, GLC-Class, CLS-Class, GLB-Class, and G-Class vehicles. Please refer to MBUSA's recall report for specific vehicle model details. An error in the communication module's SIM card software can cause a mobile network connection failure, disabling the emergency call (eCall) system.
Consequence: A disabled eCall system would prevent a vehicle occupant from contacting the emergency services call center in an emergency, potentially delaying emergency responders and increasing the risk of injury.
Remedy: The communication module software will be updated through an Over-the-Air (OTA) update or by a dealer, free of charge. Owner notification letters were mailed July 8, 2022. Owner notification letters will be mailed in phases, on July 8, 2022, May 17, 2024, July 29, 2024, and September 27, 2024. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's numbers are for this recall is 2022060005 and 2023110006.
ELECTRICAL SYSTEM:SOFTWARE · 21V058000
2021-02-05
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2016 - 2021 CLA-Class, GLA-Class, GLE-Class, GLS-Class, SLC-Class, A-Class, GT-Class, C-Class, E-Class, S-Class, CLS-Class, SL-Class, B-Class, GLB-Class, GLC-Class, and G-Class vehicles. Please refer to the Part 573 report for specific vehicle model details. The software design of the communication module may fail to communicate the correct vehicle location for the emergency call system (eCall) in the event of a crash.
Consequence: Failure of the eCall system may result in emergency responders being dispatched to the wrong location, increasing the risk of injury following a crash.
Remedy: MBUSA will notify owners, and the communication module software will be updated by a dealer, or through an over-the-air (OTA) update, free of charge. The recall began March 12, 2021. Owners may contact MBUSA customer service at 1-877-762-8267. MBUSA's number for this recall is 2021020025.
Performance
Horsepower
469hp
Torque
465lb-ft
0–60 mph
3.9sec
Quarter mile
12.1sec
Top speed
189mph
Fuel economy (EPA)
City
15mpg
Highway
21mpg
Combined
17mpg
Fuel
Premium Gasoline
Capability & size
Curb weight
3,627lb
EPA class
Two Seaters
Wiper blades
C190 AMG GT coupe. No rear wiper on coupe body style.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2019 Mercedes-Benz AMG GT 4.0L Turbo V8 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.