The 2016 S600 with the M279 6.0L twin-turbo V12 is a technological flagship with catastrophic engine failure potential that overshadows every other concern. When the engine is healthy, you're chasing ABC suspension leaks and electrical gremlins, but the piston-cracking issue makes this a high-stakes gamble.
Symptoms: Sudden onset of severe misfires, often multiple cylinders, Metallic knocking or rattling from engine block, Check engine light with misfire codes P0300-P030C, Coolant loss with no external leaks, Catastrophic failure: rod through block, seized engine
Fix: This is the M279's Achilles heel: piston skirt cracking leads to ring land failure, then bearing contamination from aluminum debris. Mercedes issued service campaigns but no full recall. Repair requires complete engine rebuild (pistons, rings, bearings, machine work, reassembly) at 80-120 labor hours, or shortblock replacement at 60-80 hours. Many owners opt for used engine swaps. Zero DIY viability.
Estimated cost: $35,000-65,000
Active Body Control (ABC) Suspension System Failures
Common · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: ABC warning light and 'ABC malfunction' message, Car drops to bump stops when parked or driving, Hydraulic fluid leaks visible under struts or accumulator, Harsh ride or uneven stance, Hissing noise from hydraulic pump
Fix: The ABC system uses hydraulic struts prone to internal seal failure. Each corner strut runs $2,500-3,500 for genuine parts, 3-4 hours labor per corner. Pulsation dampers fail ($800-1,200 each, 2-3 hours), and the tandem pump can seize ($4,000-5,000 parts, 8-10 hours). Budget $1,500-2,000 for fluid flush and filter annually as preventive.
Estimated cost: $3,000-8,000
Transmission Oil Cooler Leaks (722.9 Seven-Speed)
Common · medium severity
Typical onset: 50,000-90,000 mi
Symptoms: Transmission fluid visible on garage floor, pink/red color, Cooler lines seeping at crimped connections, Transmission overheating warnings in heavy use, Fluid level dropping between services
Fix: The external oil cooler develops pinhole leaks or crimped line failures. Replacement requires new cooler assembly, lines, and 13-conductor connector housing that cracks ($1,200-1,800 parts). 4-6 hours labor including refill and adaptation with XENTRY. Ignoring this leads to torque converter or valve body damage from low fluid.
Estimated cost: $2,000-3,500
Transmission Mounts Collapsing
Common · low severity
Typical onset: 40,000-80,000 mi
Symptoms: Clunk or thud on hard acceleration or deceleration, Vibration through floorboard at idle in Drive, Excessive driveline movement visible on lift, Transmission 'hunting' between gears under light throttle
Fix: The hydraulic transmission mount deteriorates from heat and weight of the 722.9. OEM mount is $400-600, 2-3 hours labor to drop subframe bolts and swap. Cheap aftermarket mounts fail in 10,000 miles. Often done alongside engine mounts as a set.
Estimated cost: $800-1,500
Airmatic Air Suspension Component Failures (If Not ABC-Equipped)
Occasional · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Airmatic warning on dash, Vehicle sagging at one corner overnight, Compressor running excessively, Harsh ride or bouncing over bumps
Fix: Note: Most S600s have ABC, but some markets got Airmatic. Air struts fail at diaphragm ($1,500-2,200 each, 2-3 hours). Compressor relay failures cause no-start of pump ($200-400, 1 hour). Valve block internally leaks ($2,000-3,000, 4-5 hours). Less catastrophic than ABC but still $$$.
Estimated cost: $2,000-4,500
COMAND Infotainment and Fiber Optic Network Faults
Occasional · low severity
Symptoms: COMAND screen freezes or reboots randomly, Loss of audio, navigation, or phone functions, Multiple control modules showing 'no communication' on scan, Instrument cluster going dark intermittently, Battery drain from modules staying awake
Fix: The MOST fiber optic ring is fragile. Connectors at gateway module or COMAND head unit corrode (1-2 hours diagnosis, $150-400 parts for connectors/fiber loops). Head unit failures require coding and used-unit adaptation (6-8 hours with software, $2,000-3,500 for reman unit). Parasitic draw testing takes 2-4 hours to isolate sleeping module failures.
Estimated cost: $500-4,000
Owner tips
Run a pre-purchase borescope inspection on all 12 cylinders to check for piston skirt cracks — this is non-negotiable on any M279 V12
Budget $3,000-5,000 annually for ABC fluid service, accumulator sphere replacement, and suspension preventive maintenance
Avoid extended warranties that exclude 'wear items' — they'll categorize ABC and transmission coolers as such
Keep XENTRY diagnostic history: Mercedes has quietly replaced engines under goodwill even out of warranty if service records are perfect
If buying used, confirm SCN coding is current — outdated transmission or engine software masks developing failures
Buy only with a comprehensive pre-purchase inspection including borescope and ABC pressure test, or budget $50K in escrow for engine replacement — the M279 piston issue is a ticking time bomb that makes even cheap examples expensive.
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 for start-stop system; located in trunk; high capacity required for V12 BiTurbo engine
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Every control module on the 2014-2017 Mercedes-Benz S600 — 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.
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 2014-2020 C-Class, CLA, GLA, S-Class, GLC, and GLE vehicles. Please refer to MBUSA's recall report for specific vehicle details. The front roof panel located between the windshield and the panoramic sunroof may not have been bonded correctly to the vehicle during a prior repair, allowing the front panel to detach from the vehicle.
Consequence: A detached roof panel can become a road hazard, increasing the risk of a crash.
Remedy: Dealers will replace the front panel, free of charge. Owner notification letters were mailed on August 2, 2024. Owner notification letters will be mailed in phases, on, March 22,2024, and August 2, 2024. Owners may contact MBUSA customer service at 1-800-367-6372. This recall is an expansion of NHTSA recall number 21V-197.
STRUCTURE:BODY:ROOF AND PILLARS · 21V197000
2021-03-19 · PE21001
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2020 C300 Coupe, C43 Coupe AMG, C43 AMG, 2015-2020 C300, GLA250, 2016-2018 C350e, CLA45 Coupe AMG, 2015 C400, S65 AMG, 2015-2019 C63 AMG, 2016 C450, 2015-2016 GLA45 AMG, S600, 2016-2020 GLC300, 2017-2019 GLC43 AMG, GLE43 Coupe AMG, 2014-2019 CLA250 Coupe, 2014-2015 CLA45 AMG, 2018 GLC63 AMG, 2014-2017 S550, 2018-2020 S450, 2016-2019 GLE63 Coupe AMG, 2016 GLE450 Coupe, 2014-2020 S63 AMG, 2018-2019 S560, and 2019 GLC350e vehicles equipped with a panoramic sunroof. The front roof panel located between the windshield and the panoramic sunroof may not have been bonded correctly to the vehicle during a prior repair.
Consequence: The adhesive bonding of the front panel might deteriorate, possibly causing the front panel to detach from the vehicle and become a road hazard, increasing the risk of a crash.
Remedy: Mercedes-Benz dealer will remove the bonded panel and will install a new front panel by following the detailed repair instructions and using the approved primer, cleaner and adhesive, free of charge. Owner notification letters were mailed on September 3, 2021 and October 26, 2021. Owners may contact MBUSA customer service at 1-800-367-6372.
COMMUNICATION · 19V787000
2019-11-01
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2013-2017 vehicles due to a software fault that may cause the date and time for the emergency call system (eCall) to differ from the actual date and time, potentially relaying an inaccurate vehicle location. For a full list of the affected models visit: https://static.nhtsa.gov/odi/rcl/2019/RMISC-19V787-4620.pdf
Consequence: An inaccurate vehicle location may delay emergency responders, increasing the risk of injury.
Remedy: MBUSA has initiated an Over the Air (OTA) remote update. MBUSA will also notify owners, and dealers will check software for a successful OTA or update the communication module software as needed, free of charge. The recall began December 23, 2019. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2019120008.
STEERING:ELECTRIC POWER ASSIST SYSTEM · 16V899000
2016-12-14
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain model year 2013-2015 SL550, 2013-2014 SL63 AMG, 2014-2016 E350, 2014 E350 Cabriolet, E350 Coupe, 2014-2015 S550, 2015 E350 Bluetec, 2015-2016 E400, 2016 E550 Coupe, and Maybach S600 vehicles manufactured August 23, 2012, to August 14, 2015. The affected vehicles use an electric power steering system that may have improperly soldered contacts inside the control unit, potentially resulting in the power steering system deactivating while driving.
Consequence: If the control unit pins lose connection, there would be a loss of electric power steering assist, increasing the risk of a crash. The increase in pin contact resistance can also increase the risk of a fire, even while the vehicle is parked and ignition is off.
Remedy: MBUSA will notify owners, and dealers will replace the electric power steering control unit, free of charge. The recall began October 13, 2017. Owners may contact MBUSA customer service at 1-800-367-6372.
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 2016 Mercedes-Benz S600 6.0L V12 BiTurbo M279 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.