The 2020 AMG GT with its hand-built M177/M178 4.0L twin-turbo V8 is a serious performance machine, but early examples have shown catastrophic engine failures from bearing wear and oiling issues, plus transmission cooling concerns that can destroy the 7-speed DCT if ignored.
Catastrophic Engine Bearing Failure (Connecting Rod & Main Bearings)
Occasional · high severity
Typical onset: 20,000-60,000 mi
Symptoms: metallic knocking or ticking from bottom end especially at cold start, oil pressure warning light, metal shavings in oil during analysis, sudden loss of power followed by engine seizure
Fix: Complete engine teardown and rebuild or short block replacement. This is a known defect on early M177/M178 engines where rod and main bearings wear prematurely due to oiling system inadequacies during high-G cornering and aggressive driving. Requires engine-out service, machining if crank is scored, all new bearings, gaskets, and reassembly. 40-60 hours labor depending on damage extent. Mercedes extended warranty coverage on some VINs but not all 2020s qualify.
Estimated cost: $25,000-45,000
Transmission Oil Cooler Failure and DCT Overheating
Common · high severity
Typical onset: 30,000-70,000 mi
Symptoms: transmission overheating warning on dash, harsh shifting or clutch slip under load, burnt transmission fluid smell, loss of gears or limp mode, coolant mixing with transmission fluid if cooler fails internally
Fix: Trans oil cooler fails or becomes restricted, starving the DCT of cooling. If caught early, replace cooler and flush transmission (6-8 hours). If clutches are burnt from overheating, you're looking at DCT rebuild or replacement. This transmission runs hot by design and cannot tolerate track use without additional cooling. Fluid should be changed every 20k miles for hard-driven cars.
Estimated cost: $2,500-4,000 for cooler; $12,000-18,000 for DCT replacement
Transmission Mount Failure
Common · medium severity
Typical onset: 25,000-50,000 mi
Symptoms: clunk when shifting from reverse to drive, excessive drivetrain movement felt through cabin, vibration at idle, visible tearing or oil saturation on hydraulic mount
Fix: The rear transmission mount is hydraulic and fails early, especially with launch control use. Requires lift access and exhaust removal for replacement. 3-4 hours labor. Use OEM part only; aftermarket mounts are too stiff and transfer harshness.
Estimated cost: $800-1,200
Head Gasket Failure (M177/M178 Early Production)
Occasional · high severity
Typical onset: 40,000-80,000 mi
Symptoms: white smoke from exhaust, coolant loss with no visible leaks, overheating under load, rough idle or misfires, milky oil cap residue
Fix: Early M177 engines had head gasket issues related to block/head mating surface tolerances. Requires heads-off service, resurfacing if warped, new gaskets, updated bolts, and coolant system flush. 20-25 hours labor. Often discovered during compression or leak-down testing after misfire codes.
Estimated cost: $8,000-12,000
High-Pressure Fuel Pump and Filter Clogging
Occasional · medium severity
Typical onset: 40,000-90,000 mi
Symptoms: long crank before start, misfires under wide-open throttle, fuel pressure fault codes (P0087, P0088), rough running at high RPM, limp mode under boost
Fix: The high-pressure fuel pump and inline filter can fail or clog, starving the direct-injection system. Filter replacement requires dropping the tank or accessing via rear seat area depending on model variant. Pump replacement is 4-6 hours. Use only OEM parts and premium fuel to prevent repeat failures.
Estimated cost: $1,500-2,800
Headlight Condensation and LED Driver Failures
Occasional · low severity
Symptoms: moisture inside headlight lens, flickering or dim LED low beams, headlight malfunction warning, one side completely out
Fix: Headlight housings develop seal failures allowing moisture in, which then corrodes LED driver boards. NHTSA recall covered some software updates but not the hardware failures. Replacement headlight assemblies are $2,500-3,500 EACH. Verify warranty coverage before paying out of pocket. 1-2 hours per side labor.
Estimated cost: $3,000-5,000 per headlight assembly
Communication Module Software Glitches (COMAND/MBUX)
Common · low severity
Symptoms: infotainment freezing or rebooting randomly, backup camera black screen, Apple CarPlay/Android Auto disconnects, climate control not responding to inputs, warning lights without stored codes
Fix: Software bugs in the head unit and gateway modules cause random gremlins. Dealer reflash usually resolves it (1-2 hours). Some units need full COMAND replacement if hardware failed. Keep software updated via dealer. Covered under recall for certain VINs.
Estimated cost: $200-400 for reflash; $2,500-4,000 for module replacement
Owner tips
Send oil samples to Blackstone Labs every 5,000 miles to catch bearing wear early — this engine WILL fail without warning if bearings are going
Change DCT fluid every 20,000 miles if driven hard; factory 'lifetime' fluid is inadequate for performance use
Avoid extended track sessions without aftermarket transmission and differential coolers — these cars overheat quickly
Verify engine warranty status before purchase; Mercedes extended coverage on some early M177 engines but not all qualify
Budget $3,000-5,000/year for maintenance and expect a $15,000-25,000 engine or transmission job at some point
Only buy with a comprehensive warranty or if you have $30k in reserves for when (not if) the engine or trans grenades — spectacular car when running, financial nightmare when it breaks.
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 required; battery located in engine compartment; high-performance application requires premium AGM specification
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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.
EXTERIOR LIGHTING:HEADLIGHTS · 20V775000
2020-12-11
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2020 AMG GT vehicles. The headlights may have been incorrectly aimed too high. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 108, "Lamp, Reflective Devices and Associated Equipment."
Consequence: Incorrectly aimed headlights can reduce the visibility of oncoming traffic, increasing the risk of a crash.
Remedy: MBUSA will notify owners, and dealers will check the headlight aim, and correct it, if necessary, free of charge. The recall began January 20, 2021. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2020120016.
COMMUNICATION · 20V227000
2020-04-21
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2020 AMG GT vehicles. The emergency call system (eCall) communication module may be missing the wiring harness ground line, which may cause the system to relay an inaccurate vehicle location, and restrict the ability to communicate verbally with the call center.
Consequence: An inaccurate vehicle location or the inability to communicate with the call center may delay emergency responders, increasing the risk of injury in the event of an emergency.
Remedy: MBUSA will notify owners, and dealers will repair the wiring harness of the communication module, free of charge. The recall began July 2, 2020. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2020060010.
Performance
Horsepower
523hp
Torque
494lb-ft
0–60 mph
3.7sec
Quarter mile
11.8sec
Top speed
193mph
Fuel economy (EPA)
City
15mpg
Highway
20mpg
Combined
17mpg
Fuel
Premium Gasoline
Capability & size
Curb weight
3,814lb
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 2020 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 Mechanic · 20+ years.