2015 Mercedes-Benz M-Class Repairs and Problem Descriptions at TrueDelta

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See repairs for all Mercedes-Benz M-Class model years.

Mercedes-Benz M-Class in Florida, United States Jun 2018 - Jul 2022
Jun 2018 50000 mi	Tilt wheel stuck in full up position.

Mercedes-Benz M-Class in Illinois, United States Feb 2022 - Jun 2022
Apr 2022 80000 mi US $900	Replace rear pads and rotore

Mercedes-Benz M-Class in California, United States Oct 2021 - Jan 2022
Dec 2021 71000 mi US $2100	Failed [ignition] coil

Mercedes-Benz M-Class in California, United States - Jul 2022
Jul 2022 53600 mi US $1700	All coils and spark plugs replaced to deal with sensor warning for misfire on #5. Frustrating that there was no reasonable path to debug this one part at a time, because too expensive to get in an out to the coils, unlike on a BMW. This is very young to have such problems. Only going to buy toyota from now on ...

Mercedes-Benz M-Class in Ontario, Canada May 2016 - Jun 2022
Oct 2016 52140 mi	Left Front cup Warmer/refridgerator "holding device" protruding upwards preventing cover closure. Would not seat in proper location.
Feb 2017 58900 mi	Engine code error. Dealership replaced both NOX sensors. Extended Warranty covered $2400+ repair cost. Fuel consumption dropped from 10.2 to 8.2 l/100 km on everyday driving.
Apr 2018 93620 mi	Engine code. High carbon in cyl. Sensor replaced. Running good

Mercedes-Benz M-Class in New York, United States Jan 2014 - Sep 2016
Feb 2015 7700 mi	Roof Liner loose. Mechanic removed liner and glued interior sub-roof.

Mercedes-Benz M-Class in Virginia, United States Nov 2013 - Mar 2024
Sep 2015 26000 mi	One of the diesel fuel injectors was not working right, so the dealer replaced it. When they tried to update the software in the cars computer system, they messed up and it took another day to straighten that out.
Mar 2018 59000 mi	Headlight bulb was replaced by my Mercedes dealer-- no charge.
Aug 2018 65000 mi	Steering wheel would not adjust upward and downward. Dealer replaced the steering column up/down adjustment mechanism.
Sep 2018 65000 mi	Check engine light came on. Problem was in exhaust system. Dealer replaced both NOX sensors, ADBLUE preheater and pump control system, and M.E. control module. List price for parts replaced alone was $4,324. Fortunately, I had an extended warranty from MBusa, so this cost me nothing but the inconvenience, and the dealer gave me a loaner vehicle for the entire time.
Apr 2021 89000 mi	Brought car in for replacement of parts as part of Mercedes diesel settlement. After parts were replaced, they checked the car and found a bad fuel injector. The injector was then replaced for free under the extended warrantee that was part of the diesel settlement.
Mar 2024 118000 mi US $1200	Oil leak repair

Mercedes-Benz M-Class in New York, United States Mar 2014 - Jun 2022
Nov 2017 40000 mi	Turbo sensor replaced under warranty

Mercedes-Benz M-Class in Texas, United States Jun 2017 - Jun 2022
Feb 2022 102000 mi US $1280	Oil leaks from oil cooler, intercooler hoses

Mercedes-Benz M-Class in Texas, United States Mar 2022 - Jun 2022
May 2022 14000 mi	Replaced blown strut. Rear wiper motor.

Mercedes-Benz M-Class in Texas, United States Jul 2015 - Feb 2023
Nov 2017 50000 mi US $350	Front Driver Daytime Running Lamp needed to be replaced after stopped working. One lamp plus labor was almost $400.
Dec 2021 108000 mi US $200	Battery had intermiitent issues with providing enough current to start car. Battery was replaced.
Mar 2022 109000 mi US $645	Battery wasn't holding full charge and was at risk of not having enough cranking amps to start. Replaced to ensure battery was good and that we won't be stranded somewhere.

Mercedes-Benz M-Class in Texas, United States Sep 2016 - Jun 2022
Sep 2016 31000 mi	LED running board lights not working. Easy entry/exit not working. Steering wheel not moving as it should.

Mercedes-Benz M-Class in New York, United States Oct 2013 - Jun 2018
Nov 2013	Loud noise from engine during cold start up for a few minutes. The right and left timing chain tensioners needed to be replaced. Turns out there is a bulletin already existing about this issue. I noted repair successful but I still hear it.
Sep 2014 3000 mi	The fuse for my cigarette needed to be replaced.

Mercedes-Benz M-Class in Maryland, United States Sep 2013 - Jul 2022
Jul 2022 110000 mi	rotors were vibrating when braking at high speed. Warrantee repair

Mercedes-Benz M-Class in Colorado, United States Dec 2013 - Jan 2015
Dec 2014 10000 mi	Car went into "limp-home" mode and was very sluggish. Roadside towed vehicle to dealer. Replaced crankshaft position sensor. Also had 10k mile service performed which was almost due anyway.

Mercedes-Benz M-Class in Minnesota, United States Jun 2014 - Jul 2018
Nov 2014 5000 mi	Pre-safe sensor malfunction
Dec 2014 7000 mi	Power rear hatch had intermittent problems closing. Sensors were replaced.
Jan 2018 41000 mi US $100	Bad injector. Also leaky valve stem on tire

Mercedes-Benz M-Class in Maryland, United States Nov 2014 - Dec 2014
Nov 2014 9000 mi US $20	low coolant

Mercedes-Benz M-Class in Louisiana, United States May 2017 - Jul 2020
Sep 2017 40000 mi	Cylinder 3 missing Ck done , told no problem, poss bad gas Has worked fine since/ they possibly added fuel additive No 3 cyclinder continued missing- took in 4 weeks ago, “car computer “ reset and updated. Prob worsened, took in again(3 rd time) , finally, spark plug 3 cylinders removed, found to be fouled , replaced. So far, ????

Mercedes-Benz M-Class in California, United States Mar 2017 - Jul 2018
Dec 2017 49000 mi US $600	rear brakes worn.
Jan 2018 48000 mi	Door handle had to be replaced. Under warranty
Feb 2018 48700 mi	Worn seatbelt replaced under warranty. Everything that gets daily use wears out inside this car in about 50,000 miles. Otherwise the car drives beautifully, and handles beautifully, and looks really good, too.

Mercedes-Benz M-Class in New York, United States Jun 2014 - Jun 2022
Apr 2017 7500 mi	Check engine light popped up. Took it to the dealer. I was told that a software update was needed. 0.0 cost due to warranty
May 2018 15000 mi	The brake light bulb was out on the driver side. It did take more than 10 minutes, only because they provided complimentary inspection of the vehicle.

Mercedes-Benz M-Class in California, United States Dec 2013 - Dec 2013
Dec 2013 13000 mi	Strange noise at startup tailgate won't open

Mercedes-Benz M-Class in Alberta, Canada Oct 2013 - Sep 2015
Jun 2014 8060 mi	Sunroof rattle. Dealer removed headliner and tightened two screws.

Mercedes-Benz M-Class in New Jersey, United States Dec 2015 - Sep 2016
Feb 2016 56000 mi	Engine idling low and running roughly after stopping from highway speed.
Sep 2016 61000 mi	Problem with low, rough idle was intermittent and could never be duplicated by the dealer.

Mercedes-Benz M-Class in Pennsylvania, United States Mar 2017 - Jun 2022
Jan 2018 80000 mi US $500	Fluid change.
Feb 2022 147000 mi US $3000	New water pump hoses thermostat belts pulleys valves and cam shaft gaskets

Mercedes-Benz M-Class in Victoria, Australia Dec 2012 - Apr 2017
Jun 2013 7440 mi	Headlight high beam operation faulty
Aug 2013 9540 mi	Headlamp not dipping correctly or going to high beam.
Feb 2015 25420 mi	Oil seal leak

Mercedes-Benz M-Class in Western Australia, Australia Nov 2013 - Jun 2022
Feb 2016 18600 mi	Squeaks and rattle in the driver's seat.
Jun 2016 21700 mi	Car went into limp mode and car had to be towed in for inspection. No fault found after several days of testing.
Jan 2022 62000 mi A $2500	EGR Valve replaced
May 2022 65100 mi A $1800	Nox Sensors faulty and replaced under goodwill arrangement.

Mercedes-Benz M-Class in Florida, United States Feb 2014 - Jun 2018
Jun 2017 40000 mi	Replaced NOx sensors. Replaced soot sensor.

Mercedes-Benz M-Class in Texas, United States Sep 2015 - Aug 2018
Aug 2018 98000 mi	Bad valve associated with Diesel engine

Mercedes-Benz M-Class in Ontario, Canada Nov 2016 - Mar 2017
Dec 2016 39680 mi	Left front wheel bearing replacement

Mercedes-Benz M-Class in New York, United States Dec 2015 - May 2017
Apr 2016 43000 mi	LED running board out Engine Light Wiper fluid level sensor Trunk latch
Aug 2016 47000 mi	Sunroof wind deflector became loose. Burnt right side brake light
Sep 2016 48000 mi	Engine Light, bad NOx sensors, both front and back. Replace by dealer
Jan 2017 42500 mi	Air inlet to turbo gasket causing oil leak Moonroof did not close properly. Need cleaning and grease.

Mercedes-Benz M-Class in New York, United States Apr 2016 - Dec 2017
Dec 2017 94000 mi US $972	EGR replaced

Mercedes-Benz M-Class in Texas, United States Jun 2013 - Feb 2016
Oct 2014 19500 mi	The AC had a "musty" smell when first turned on.

Mercedes-Benz M-Class in Pennsylvania, United States Jan 2013 - Jan 2022
Jan 2016 18000 mi	Check engine code indicated problem with torque converter. Torque converter was replaced under warranty.
Sep 2020 39400 mi US $1300	Bad balking or hesitation at every shift point. Replaced oil cooler seal and resulting Mass Air Flow assembly

Mercedes-Benz M-Class in Texas, United States Mar 2013 - Sep 2015
Feb 2013 300 mi	Repaired chafed wiring related to the parking brake switch.
Oct 2014 21700 mi	Air bladder in driver's seat bottom inoperative. Seat bottom replaced.
May 2015 29000 mi	Clunking noise in front end, right front strut replaced.
Jul 2015 31800 mi	Steering wheel height adjustment not working. They said it's temporarily fixed, but will re-occur. New part on order.

Mercedes-Benz M-Class in Washington, United States Dec 2012 - Jan 2014
Feb 2013	Would not recognize the key fob

Mercedes-Benz M-Class in Ontario, Canada Dec 2012 - Jun 2018
Jul 2013 23320 mi	keyless go malfunction quickly got worse not starting once not shut off replace ingnition switch value $1200 length of repair caused sunroof to need resetting on second visit
Mar 2014 39680 mi	Engine light on for preheater in DEF system. Corrected replaced, then needed pressure hose.
Jul 2015 71880 mi	Oil cooler system leak Soot sensor defective serpentine belt broke and pully's worn. Long wait for parts
Dec 2015 85560 mi C $250	Rear Wheel bearing
Jul 2016 97340 mi C $2500	Replace both rear radar sensors for blind spot system
Jan 2017 103540 mi C $2500	2- Oxygen sensors
Sep 2017 120280 mi	Leaking oil again
Jun 2018 140120 mi C $1202	Replace MAF sensor

Mercedes-Benz M-Class in Alberta, Canada Sep 2015 - Jun 2017
Feb 2017 39000 mi	The urea tank heater had to be replaced at 62,000 km of which MB paid for half (total bill $1500). Urea tank heaters are not considered part of the fuel system and are often exempted from 3rd party warranty programs....just FYI.

Mercedes-Benz M-Class in California, United States Sep 2015 - Jun 2018
Oct 2015 45800 mi	Car would not start, when it eventually did start the engine died immediately. Sent to Mercedes of San Diego, computer software updated.

Mercedes-Benz M-Class in Florida, United States Apr 2013 - Apr 2015
Nov 2013 14000 mi	Fixed air conditioner
Dec 2014 22000 mi	Passengers seat torn.

Mercedes-Benz M-Class in Georgia, United States Feb 2016 - Apr 2017
Mar 2016 18000 mi	replaced computer. Door locks would not work . start button would not work, several electrical items would not work. First dealer could not diagnose. 2nd dealer diagnose and repair in one day
Feb 2017 22000 mi US $1400	Upper front strut mounts worn out, major rattling noise. Dealer diagnosis and refused to repair under warranty at only 22,000 miles. Called MBUSA and no help there. MB sucks and we had repair done at local shop for less than 50% of dealer. Out of warranty by three months. Mercedes after much insisting offered to pay 40%.
Mar 2017 22000 mi	Sensor on emission control.
Apr 2017 22000 mi	Never repaired a rattling in the steering column that had a TSB on it. This MB was totally unreliable and we were afraid to drive it to our Florida winter home as something always went wrong from sensors and it seemed like we always got at least one I warning light each trip.

Mercedes-Benz M-Class in New Hampshire, United States Dec 2012 - Jun 2018
May 2017 65000 mi US $500	Broken Windshield Wiper arm assembly.Arm synchronizing hardware failed , resulting in broken windshield, as well as the repair of the arm assembly
Sep 2017 72000 mi US $600	Cam shaft sensors

Mercedes-Benz M-Class in Virginia, United States Dec 2012 - Dec 2015
Mar 2015 46000 mi	Nav system hard drive failed...replaced under warranty.

Mercedes-Benz M-Class in California, United States Sep 2015 - Dec 2015
Nov 2015 33400 mi	Leaky front differential

Mercedes-Benz M-Class in Kentucky, United States Sep 2013 - Jun 2017
Sep 2013 1000 mi	Keyless-GO exterior door handle non-responsive, passenger side
Jul 2014 9500 mi	Windshield washer reservoir sensor did not report empty reservoir. Loose connection fixed.
Jun 2017 40000 mi	Timing chain noise at startup. Known service bulletin

Mercedes-Benz M-Class in Maryland, United States Dec 2012 - Apr 2014
May 2013 6000 mi	Rattle/clicking sound in front seat. Seat frame was defective and needed to be replaced. Warranty item.

Mercedes-Benz M-Class in Virginia, United States Nov 2013 - Oct 2015
Jan 2014 6300 mi	Updated NAV unit Firmware

Mercedes-Benz M-Class in Ontario, Canada Feb 2017 - Mar 2017
Feb 2017 60760 mi C $1400	NOx censors replacement

Mercedes-Benz M-Class in Pennsylvania, United States Oct 2013 - Oct 2015
Nov 2014 33700 mi	Blown gasket; plus a second transmission oil leak

Mercedes-Benz M-Class in Texas, United States Jan 2013 - Apr 2013
Apr 2013 17000 mi	Interior door panel creaks, apparently there was a TSB to add felt tape behind the panels (b pillars) which fixed the issue.

Mercedes-Benz M-Class in Quebec, Canada Feb 2013 - Mar 2014
Mar 2014 26040 mi	The 2 lighted M-B sign on passenger and driver floor Part of the emission system had to be replace

Mercedes-Benz M-Class in New York, United States Oct 2014 - Jun 2018
Feb 2016 52100 mi	Oil leak

Mercedes-Benz M-Class in Washington, United States Nov 2011 - Jun 2022
May 2012 7500 mi	Clamp holding boot came loose and leaked grease on nearby parts. Clamp re-installed and repaired as warranty item. No apparent damage to C-V joint assembly from loss of grease.
Jul 2014 38000 mi	Window seal noise repaired on driver/passenger front doors.
Aug 2014 38500 mi	Seeping Oil pan gasket was replaced under warranty before it developed into significant problem.
May 2016 55000 mi US $350	Replaced rear pads due to wear at customer expense. First change since new. Replaced computer/circuit board for "pre-safe" seatbelt tightening/collision avoidance under warranty (extended).
Feb 2017 63000 mi	DEF heater in DEF tank failed and was replaced.
Jun 2017 66000 mi	Window replacement through insurance. Rock chip.
Jun 2018 66000 mi	02 sensor in exhaust.
Apr 2021 100000 mi	Diesel exhaust system replacement under Mercedes Benz legal settlement
May 2022 110000 mi	Seals to intake, oil cooler replaced.

Mercedes-Benz M-Class in Washington, United States Mar 2012 - Dec 2014
Jan 2013 24700 mi	Total COMMAND system failure. Service technician indicated replacement component would have cost approx $5000 if out of warranty.
Feb 2013 17400 mi	Tailgate actuator failed

Mercedes-Benz M-Class in Virginia, United States Jun 2015 - Jul 2015
Jul 2015 60000 mi	Shorted harness resulted in destruction of computer and messed up Adblue system

Mercedes-Benz M-Class in Ohio, United States Aug 2015 - Aug 2016
Dec 2015 68000 mi	Turbo seal replaced. Then oil cooler oil leak discovered. Out of warranty but paid $0 (goodwill).
May 2016 69300 mi US $1500	air suspension failed. Dealer had car in twice to complete repair.
Aug 2016 70000 mi US $1800	Oil leak at turbo repaired, leak continued. Ultimately determined the problem was with the intercooler. All told dealer had Mercedes for 3 months on and off. Dealer did complete the repair and covered it under warranty even though I was out of warranty.

Mercedes-Benz M-Class in Washington, United States Sep 2016 - Jun 2022
Oct 2017 99000 mi US $400	Battery replacement in addition to a standard B3 service
May 2022 103000 mi US $850	Massive water leak that filled up the spare tire space and throughout the chassis (couple of gallons of water from behind each wheel well and boot of suv). Water shorted out the fuel pump control module and the battery required replacing. Not clear where the water leak originated. No evidence inside the vehicle. Drain vents were cleaned and drain plug in rear was removed to ensure flooding would not happen again.

Mercedes-Benz M-Class in Ohio, United States Nov 2017 - Jun 2022
Jun 2018 56000 mi US $170	Power rear door drive made horrible noises and wouldn't engage to lift the door. Purchased replacement part from dealer and replaced it.
Sep 2021 114850 mi US $450	The dreaded oil cooler seals were leaking. Removed everything from the engine above the block to replace the oil cooler seals. Many consumables replaced on other systems. Also cleaned out a large amount of built up oil soot from the air intake system downstream of the throttle body.

Mercedes-Benz M-Class in Alberta, Canada Dec 2015 - Jun 2017
Feb 2016 48100 mi	Leak through top of windshield.
Jan 2017 47900 mi C $800	Main fuel pump replacement

Mercedes-Benz M-Class in Texas, United States Jan 2012 - Jun 2022
Sep 2015 73000 mi US $604	replace drive shaft rear flex disc - parts $206.25, labor $256.37 Anti-microbial treatment to A/C evaporator due to persistent bad smell - $140.95 - this smell issue seems to affect many MLs, and our service advisor told us MB will try to fix it under warranty only during the first year of ownership.
Apr 2016 86200 mi US $325	replaced suspension links to cure clunking noise replace hub and bearing
Nov 2016 104600 mi US $325	Replaced worn cover on drivers bottom seat. Purchased OEM cover on line, had local trim shop install it.
Nov 2017 133000 mi US $700	Lock on rear tail gate failed, lock replaced, which require disassembly of entire tail gate $600.00 Another attempt to remove bad smell from A/C, still not completely successful $90.00 Another attempt to remove bad smell from A/C, still not completely successful $90.00
Apr 2018 143000 mi US $930	Passenger seat cover worn, MB only sells cover as part of complete lower seat assembly due to airbag weight sensors imbedded in seat so repair was much more expensive than expected. Bought OEM seat assembly on internet from a MB dealer for $830 (local MB dealer wanted MSRP of $1200 for the part only!), had trim shop install for $95. Car computer had to be reset by MB dealer ($260).
Jul 2018 149000 mi US $1200	Replace rear struts due to rough ride with occasional bottoming, also did 4 wheel alignment at same time
Jan 2022 233000 mi US $1875	The original alternator failed after 233,000 miles. Replaced alternator
Mar 2022 236000 mi US $1500	replace right side catalytic converter due to persistent check engine light

Mercedes-Benz M-Class in California, United States Oct 2011 - Dec 2014
Mar 2013 15000 mi	Creaking noise when turning. Wheel bearings repaired on right front.
Jan 2014 22000 mi	Cv Joint repair for the 2nd time

Mercedes-Benz M-Class in Florida, United States Oct 2011 - Jun 2017
Jan 2013 13000 mi	Replaced washer pump motor
Sep 2013 17000 mi	Had no turn indicators and no blind spot assist. They replaced the steering wheel module.
Sep 2014 24000 mi	Replaced drivers seat cover. P-Tex was delaminating.
Jun 2015 28000 mi	A/C had a bad smell when started. They needed to install drain plugs so water does not accumulate in the vents.

Mercedes-Benz M-Class in New York, United States Oct 2011 - Apr 2013
Oct 2012 10500 mi	Low coolant Warning Came on. Added half an inch of coolant to the reservoir, said common. Seat insert on back of front seat has to be replaced. Ordered.
Apr 2013 15000 mi	Seat material still on order. Pigment loss. Power tailgate would not go up intermittently and get stuck.

Mercedes-Benz M-Class in Virginia, United States Dec 2015 - Jun 2022
Dec 2017 49000 mi US $890	Replaced rear brake pads and rotors Driver’s shoulder harness adjustment was not moving out of the lowest position and was successfully repaired by dealer under warranty

Mercedes-Benz M-Class in North Carolina, United States Nov 2012 - Dec 2014
Dec 2013 26000 mi	Driver seatcover replacement

Mercedes-Benz M-Class in Massachusetts, United States Feb 2014 - May 2018
Jul 2014 28800 mi	Back up camera lens scratched needed to be replaced
Jan 2015	Rear vent broken, needed to be replaced.
Aug 2016 60000 mi US $400	replaced spark plugs and engine light came on for an emission leak. shop claimed not related but I believe it was and they caused it by not replacing intake resonator seals. had to pay to replace seals.

Mercedes-Benz M-Class in Illinois, United States Dec 2012 - Dec 2015
Apr 2014 6000 mi	Fuses igniting cylinders blown twice. Replaced ignition coils. Fixed after second attempt.

Mercedes-Benz M-Class in North Carolina, United States Aug 2014 - Jun 2018
Sep 2015 37000 mi	Creaking noise from front strut. Car sometimes turns on and then shuts off right after pushing the start button. There was a software update to fix.
Feb 2016 39600 mi US $450	Transmission and locks were acting up. A new battery solved the issues.
Mar 2018 60000 mi US $1200	Cable was severed leading to a fuel pressure sensor. First replaced sensor and then found damaged wire. Heat shield under car was responsible.

Mercedes-Benz M-Class in Connecticut, United States Apr 2014 - Feb 2016
Nov 2014 29000 mi	Smart Key failed to start car. Smart Key replaced by dealer under warranty.
Jan 2015 36000 mi	Rattle coming from under passenger seat. Dealer had to disassemble passenger/seat area, and remove a foreign object from the under seat heating ducts.
Jul 2015 34000 mi	Power sunroof does not autoclose to the proper position. Computer reprogrammed, which solved the problem for two weeks. After two weeks, original failure reoccurred. Power sunroof does not autoclose to proper position, failure reoccurred after computer reprogramming. Closed detected position not being stored properly in sunroof motor. Sunroof motor and related sensors replaced.
Feb 2016 37000 mi	Rear Window switch not working. Dealer replaced switch.

Mercedes-Benz M-Class in New Jersey, United States May 2012 - Jun 2015
Dec 2012 5000 mi	Rough idle, occasional stall on cold start.

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