2009 Mercedes-Benz M-Class Mercedes-Benz M-Class 2009

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2009 Mercedes-Benz M-Class repairs by problem area

Engine (36%)

Transmission and Drivetrain (1%)

Brakes and Traction Control (2%)

Suspension and Steering (15%)

Electrical and Air Conditioning (29%)

Paint, Rust, Leaks, Rattles, and Trim (5%)

Other (9%)

Chart based on 98 repairs.
See TSBs and recalls for the 2009 Mercedes-Benz M-Class.

2009 Mercedes-Benz M-Class repair cost distribution

$2500+ (4%)

$1000 - $2499 (19%)

$500 - $999 (16%)

$100 - $499 (19%)

< $100 (43%)

Worried about potential repair costs? An extended warranty can provide peace of mind.

Chart based on 81 repair trips. The repair cost chart excludes repairs made under warranty, do-it-yourself repairs, and repair trips that include maintenance.

2009 Mercedes-Benz M-Class

Engine not specified

Mercedes-Benz M-Class in Ontario, Canada
Mar 2013 - Aug 2013
Apr 2013

53960 mi

C $1200
Major engine job to fix an oil leak, partially covered by warranty. 

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2009 Mercedes-Benz M-Class 4dr SUV

turbocharged 221hp 3.0L V6 Diesel 7-speed shiftable automatic AWD

Mercedes-Benz M-Class in Ontario, Canada
Jul 2013 - Feb 2016
Apr 2015

86160 mi

C $140
LED in rear tail light went out. a complete new assembly was the only answer 
Jun 2015

89280 mi
Rear main seal is leaking. Losent a quart in two months. 
Jan 2016

81220 mi
Still trying to diagnose the 18 faults. Looks like CDI computer. Replaced the Maf sensors but still hhave the same problem Wiring harness frayed at motor mount Both EKAS sensors defective, shutoff motor defective, EGR faulty and oil cooler seals changed, replaced ad blue tznk heater ( 2nd time in two years) 
Mercedes-Benz M-Class in Brazil
May 2016 - May 2021
Apr 2016

70060 mi

$100
The tailgate/trunk was not closing. Removed the lock actuator, disassembly one of the mini 12v dc motors inside it and replace it. Now working fine. 
Feb 2017

68820 mi

$10
CDI Inlet Port Shut off motor making the car going to limp mode. Remove the connector plug and insert a 4.7kohms resistor so the computer thinks it is still connected. Problem solved but MPG raised about 10%. 
Jul 2017

72540 mi

$300
The tailgate/trunk not closing again. bought a new lock actuator and replace the entire part. 
Sep 2017

76880 mi

$90
Change shock absorbers 

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2009 Mercedes-Benz M-Class 4dr SUV

turbocharged 210hp 3.0L V6 Diesel 7-speed shiftable automatic AWD

Mercedes-Benz M-Class in Ontario, Canada
Jul 2015 - Mar 2016
Aug 2015

82460 mi

C $2100
Check engine light came on, emission problem diagnosed. 2nd time adblue heater needed replacement 
Mercedes-Benz M-Class in Alberta, Canada
Mar 2014 - Mar 2015
Mar 2015

99200 mi
Wheel bearing Door lock replaced 
Mercedes-Benz M-Class in Maryland, United States
Mar 2014 - Jul 2014
Jul 2014

90000 mi

US $1800
Diesel Emission Fluid tank heater 
Mercedes-Benz M-Class in California, United States
Mar 2010 - Dec 2016
Dec 2010

25010 mi

US $1426
Windshield replacement due to crack caused by passing truck $1,426.25; mostly paid by my insurance. 
Jan 2011

32477 mi
Previous repair (right front bearing) didn't fix problem; replaced left strut assembly Previous repair (right front bearing) didn't fix problem; replaced left strut assembly; replaced buttons at steering wheel due to squeaky noise. 
Apr 2011

27670 mi
Replaced right front bearing N/C;That took several attempts to fix until the correct item was determined. This would have been a really expensive repair for the owner if this would not have been covered by warranty. 
Jan 2012

32620 mi
lubricated squeaky shift paddles on steering column 
Apr 2012

35866 mi
NOx sensor replaced under warranty for the first time; regular cost including air cleaner turbo seal would have been $1,350.92. 
Sep 2012

42541 mi
Left rear central door lock inoperabel fixed under warranty; door lock assembly replaced; regular cost after 15% courtesy discount for 2nd repair of another door later was $834. 
May 2013

50843 mi
Auxiliary heater of AdBlue (Urea) tank diagnosed as defective; MBUSA claimed not covered under emissions control warranty though it would not have passed SMOG test. Dealer paid ~$2,200.- from a slush fund. 
Sep 2013

53277 mi

US $834
Right front door lock defective latch assembly; the 2nd on this car; first one fixed under warrant. MBUSA refused to cover anything as warranty had run out; dealer gave 15% discount - cost to me $834. 
Jul 2014

60028 mi

US $1351
NOx sensor replaced for 2nd time; also EGR Temperatur Sensor and air cleaner turbo seal replaced. $1,350.92 
Sep 2014

56633 mi
NOx sensor replaced on April 5th, 2012 had shaken loose. Dealer fixed free of charge as it was their responsibility. 
Oct 2014

66241 mi

US $1676
Turbocharger Intake Shut-off Motor was defective; no spare parts in USA available; had to be imported from Germany. $1,675.89 
Mar 2015

69000 mi

US $504
paid for Bad Glow Plug Control Module. In addition dealer fixed free of charge Turbo Pipe Gree O-Ring seal & V-ribbed belt. Engine oil leak and damage to belt caused by previous repair. 
Sep 2015

75000 mi
Temperature sensor upstream of turbo defective and replaced; $516.06 plus sales tax Replaced 3 engine mounts due to leaks; $1,778.38 plus sales tax 
Oct 2015

75500 mi
Vehicle lost power and went into limp home mode on freeway. Had to dive on emergency strip and reboot car at turnout. Car caused no other trouble. No error codes showed up when dealer tested; no charge. 
Mar 2016

81000 mi

US $5384
2 collapsed air suspension front struts and defective air compressor; all replaced; slow leak on right strut caused left strut & compressor to fail. Tire wear due to consequent bad wheel alignment required 4 new tires not incl. in cost above Turbo inlet pipe seals replaced $186.01 plus sales tax Transfer case input shaft seal replaced and oil replenished $807.84 plus sales tax Backup camera & module finally replaced after years of haggling. Intermittent outages usually when humid or rainy; eat. cost $2,400. Yes, you read that right. MBUSA and dealer paid as problem 1st appeared during warranty period. 
Mercedes-Benz M-Class in California, United States
Mar 2014 - Jun 2022
Feb 2016

43900 mi

US $150
Engine failed to start, it would crank but not start. NO CEL, NO Add Blue lights. Towed to shop, where it started, no error codes were noted. Issues could not be duplicated. 
Sep 2016

48000 mi

US $480
TPMS system, two of the sensors went out, replaced all four 
Nov 2017

62000 mi

US $2200
Diesel Exhust Fluid heater replacement. 
Dec 2021

103000 mi

US $2226
Front Break pads and Rotors with system flush 
Mercedes-Benz M-Class in California, United States
Mar 2013 - Jul 2013
Jul 2013

60000 mi
Oil cooler seals leaking. Fixed under goodwill warranty work otherwise it would have cost $2200 
Mercedes-Benz M-Class in Iowa, United States
Jul 2013 - Mar 2014
Dec 2013

72000 mi
Oil seal 
Mercedes-Benz M-Class in South Carolina, United States
Mar 2013 - Jun 2013
Apr 2013

27000 mi
water leaked into the rearseat area of the car where computer piece got wet. Cars rear lights stayed on, front lights flashed continiously 
Mercedes-Benz M-Class in Ontario, Canada
Oct 2014 - Oct 2014
Oct 2014

83700 mi
Door locks motors stopped working in 3 of the 4 doors 
Mercedes-Benz M-Class in Maryland, United States
Apr 2017 - Jun 2018
Jul 2017

30000 mi

US $500
Blower motor had some issue 
Mercedes-Benz M-Class in Connecticut, United States
- Jan 2009
Jan 2009 Has about 14,000 miles. Back to dealer once to fix numerous small things: rear windshield wiper motor, right rear power window switch, rear seat belt retractor. What has been a nagging problem is the pollution control system. Has been back 4 times. 

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2009 Mercedes-Benz M-Class 4dr SUV

503-horsepower 6.2L V8 7-speed shiftable automatic AWD

Mercedes-Benz M-Class in Wisconsin, United States
Jan 2019 - Jan 2022
Apr 2019

120000 mi

US $2300
Rear air shocks 
Jan 2022

143000 mi

US $2000
Front air shocks 
Mercedes-Benz M-Class in Washington, United States
Mar 2018 - Jun 2022
May 2018

86000 mi

US $50
whining noise coming from power steering pump... replace reservoir 
Sep 2019

86000 mi

US $200
battery wouldn't hold charge 

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2009 Mercedes-Benz M-Class 4dr SUV

382-horsepower 5.5L V8 7-speed shiftable automatic AWD w/low range

Mercedes-Benz M-Class in Costa Rica
May 2013 - Feb 2017
Feb 2014

43400 mi

$2800
Rear air springs replaced. Rear turn light led Passanger and driver lock doors were not working. 
Jun 2014

47120 mi

$500
Steering pump didn't work. Replaced for a new one. 
Jan 2015

$2100
Door attenuator didnt work 
Mar 2016

65720 mi

$1000
Some parts replaced 

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2009 Mercedes-Benz M-Class 4dr SUV

382-horsepower 5.5L V8 7-speed shiftable automatic AWD

Mercedes-Benz M-Class in Illinois, United States
Dec 2017 - Dec 2021
Mar 2018

44000 mi
Possible defective thermostat 
Jun 2018

45000 mi

US $100
door lock not functioning 
Mercedes-Benz M-Class in California, United States
Jul 2013 - Jan 2017
Jan 2014

81200 mi

US $670
Rear right turnsignal LED array was burnt out. Part is integrated into taillight, requiring full tailight to be replaced 
Oct 2014

80500 mi

US $60
LCD screen started to develop lines and lose color, eventually become illegable. 
Mercedes-Benz M-Class in Washington, United States
Aug 2013 - Jun 2022
Nov 2013

49900 mi

US $19
Leakage in power steering fluid reservoir Broken clip related to trunk cover. 
Feb 2014

51000 mi
Replaced thermostat. 
May 2014

54300 mi
Replacing clips for tailgate interior panel. 
Sep 2014

60000 mi
Tailgate issue. Occasionally would not latch. Replaced latch. 
Dec 2014

61000 mi

US $500
Ignition coil. 
Nov 2017

116000 mi

US $800
Power steering pump replaced 

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2009 Mercedes-Benz M-Class 4dr SUV

268-horsepower 3.5L V6 7-speed shiftable automatic RWD

Mercedes-Benz M-Class in California, United States
May 2016 - May 2017
Sep 2016

114000 mi

US $50
brake lights went several times in two months. Mercedes wants to sell you an expensive new unit. You need to find a mechanic who can clean the connection between socket and light. Mine got done for $50. 

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2009 Mercedes-Benz M-Class 4dr SUV

268-horsepower 3.5L V6 7-speed shiftable automatic AWD

Mercedes-Benz M-Class in Quebec, Canada
Mar 2017 - Mar 2018
Jan 2018

83700 mi

C $650
wiper arms system 
Mercedes-Benz M-Class in New York, United States
Mar 2013 - Sep 2015
Aug 2013

69000 mi
AC temp senors needed replacing 
Sep 2014

85000 mi
AC not working consistently 
Apr 2015

92500 mi

US $1300
Water pump seal and bearings 
Sep 2015

100000 mi
Ac would stop working intermittently in very hot weather 
Mercedes-Benz M-Class in Pennsylvania, United States
Mar 2013 - Sep 2014
Jun 2013

42000 mi
DVD draining battery 
Jul 2014

50000 mi
DVD was draining battery. Was not defective, just installed wrong when original DVD failed and was replaced by the dealer. 
Mercedes-Benz M-Class in Colorado, United States
Mar 2013 - Jun 2022
Mar 2014

37000 mi

US $836
ignition would not sense the key fob. ignition starter switch was replaced. 
Aug 2017

52000 mi

US $900
thermostat needed replacing 
Sep 2017

53000 mi

US $1400
Both lock actuators on front doors needed replacing 
Mercedes-Benz M-Class in New York, United States
Mar 2013 - Jul 2018
Feb 2015

64100 mi

US $250
Replace thermostat. 
Aug 2016

80000 mi

US $300
Replaced Coil Springs 
Jun 2018

100000 mi

US $350
Replaced camshaft sensor magnets to solve P016 problem, but to no avail. Likely causes either: Balance Shaft, Camshaft Adjusters, or Timing Chain. 
Mercedes-Benz M-Class in New York, United States
Jun 2013 - Jun 2022
Aug 2013

17900 mi

US $650
Basic oil & filter stop, brake calipers replaced, multi-point check & service recall. We wanted the truck checked from top to bottom. Great experience! 
Feb 2015

23000 mi
Auxillary battery replaced under warranty. We were alerted by a dash indicator. Mercedes also told us that the main, original battery would also need replacement soon, including resets, at a cost of $400 or so. 
Apr 2016

31000 mi
Ignition switch failed intermittently; we'd get a readout that key doesn't match the car. Then we'd turn it off, try it again, and eventually it would work. We got a loaner, told them no rush, and repair was warranty covered. 
Sep 2016

32000 mi
One of the headlight bulbs went out. Dealer replaced it for free as a courtesy. 
Feb 2017

35000 mi
CD deck won't eject discs, makes clicking noises for a few minutes on startup, needs replacement. New is expensive so getting a refurb from SoCal Mercedes, will replace myself. Radio works so no hurry.  They replaced a headlight bulb for free 
Aug 2017

37244 mi

US $839
I installed a recon nav/audio but no way to unlock "anti-theft (AT) warning message." Neither dealer, Socal parts or YouTube told me to expect this. Dealer removes unit, obtains pin from their MB internal network, performs start-up to unlock AT, plus software update and coding! Pathetic. This cost $215.  With headlight bulb, inspection, and "B service" total was $839. N/C to "renormalize" the operation of all windows since one of the rears was slow. 
Nov 2017

38000 mi

US $380
Right rear tire replaced. Could not be repaired with a plug so new tire fitted - road hazard warranty for the Continenals purchased 15K miles ago no longer in effect. Slow leak, onboard computer alerted us, dealer found a nail went through the inside sidewall. 
May 2018

38802 mi

US $325
Warning light showed one of the stop light bulbs had failed. Dealer found contacts burnt, with the other side near failure. Installed "stop light socket updates" and two new bulbs. Labor was 235 and parts were 64. 
Jun 2018

42500 mi

US $322
Left rear tire replaced, had been losing pressure for several months, so I just kept refilling it. 
Jan 2019

47291 mi

US $1420
Battery dead, jumped vehicle to get to dealer, replaced battery; Blower motor replaced (it kept running, drain for fresh air intake box clogged malice Front parking lamp bulb replaced. 
Aug 2019

52073 mi

US $667
"B" service + inspection. 
Aug 2020

57590 mi

US $3997
Driver's side window switch panel replaced; "1 year/10K Service" performed; Replace spark plugs; Replace front & rear brakes/rotors; Replace rear springs (one was cracked, was told we had to do both malice Replace all wiper blades; Inspection. 
Mercedes-Benz M-Class in Missouri, United States
Sep 2015 - Jan 2016
Jan 2016

102000 mi

US $320
Thermostat. 
Mercedes-Benz M-Class in Nebraska, United States
Apr 2014 - Dec 2014
Jun 2014

47000 mi

US $375
Serpentine belt was worn and squealing intermittently Rear seatbelts would not completely retract. MB offered goodwill warranty for labor costs. 
Mercedes-Benz M-Class in Ontario, Canada
Feb 2013 - Feb 2013
Feb 2013

77500 mi
thermostat failed thermostat failed 

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2009 Mercedes-Benz M-Class Repair Histories

See our lemon odds and nada odds page to see vehicles with no repairs or vehicles with more than three repairs. To see how frequently 2009 Mercedes-Benz M-Class problems occur, check out our car reliability stats.