2009 Mercedes-Benz ML320 Engine cooling Problems
- Complaints
- 4about this part
- Share
- 14%of 28 total for the year
- Median mileage
- 58,331miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 4 complaints about the engine cooling of the 2009 Mercedes-Benz ML320, 14% of the 28 complaints for this model year. Where a mileage was given, the median is 58,331 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“Check engine light warning with code #20be1b. Repair indicates need of diesel exhaust fluid (def) heater repair kit. Diesel exhaust fluid system is part of emissions system. Mb dealership says no warranty for repair. Internet research widespread problem with def system around 50,000 miles.”
NHTSA complaint #10672030, filed 2015-01, 58,331 miles“The SUV slows and/or stalls suddenly at different speeds. Started around 8,000 original miles on odometer. It is a 2009 ml 320 bluetec. Occurs unexpectedly for few seconds randomly.”
NHTSA complaint #10359031, filed 2010-10, 8,000 miles“The contact owns a 2009 mercedes benz ML320. While driving approximately 60 MPH, the vehicle stalled without warning. The vehicle restarted after several attempts. The vehicle was taken to an independent mechanic who stated that the camshaft position sensor failed and needed to be replaced. The vehicle was repaired. The manufacturer was made aware of the failure. The approximate failure mileage was 60,000. Updated 4/30/15 the consumer also stated the glow plug control unit, heat element and door lock failed. Updated 05/07/15”
NHTSA complaint #10683919, filed 2015-02, 60,000 miles“Letter from regarding numerous issues and troubles he has faced since the purchase of his Mercedes-Benz vehicle, a 2009 ML320 blue tec diesel engine SUV; seeking assistance-he would like acknowledgement of receipt of this complaint the consumer stated the first problem he encountered with the vehicle was in may of 2010, within less than a year of purchase, while driving, the gas gauge all of a sudden went from a half tank of fuel, to reading empty, where at that point the fuel light illuminated. Even though he knew the tank was not empty, he stopped to the gas station and re-fueled. …”
NHTSA complaint #10481822, filed 2012-10Related service bulletins
- 10248173Dec 11, 2023Mercedes-Benz AG ("MBAG"), the manufacturer of Mercedes-Benz vehicles, has determined that on certain Model Year (âÂÂMYâÂÂ) 2009-2012 GL-Class, ML-Class, R-Class, and…
- 10166980Feb 10, 2014Traces of oil in area of oil cooler (inner V) on engine 642
- 10166978Feb 6, 2014Engine diagnosis warning lamp lights up - Fault code entry (FC) 14A600 or 14A700
- 10041208Mar 30, 2011Mercedes benz: engine light is on with stored trouble codes.
- 10038227Dec 8, 2010Mercedes-benz: the starter clicks but does not crank when trying to start. A voltage dip is causing the ignition procedure to fail.
- 10034504Mar 18, 2010Mercedes (xentry): engine diagnosis warning lamp activated. Magnetic short between armature and pole core due to calibration error at valve and tolerance deviation by supplying…
- 10034625Feb 22, 2010Mercedes (xentry): engine makes noise, ticking/crackling at idle speeds up to approx. 1500 rpm. Run in effect of 1st crankshaft main bearing. Models 211, 219, 164, 251, 203, 204…
- 10033070Dec 16, 2009Xentry (mercedes): engine warning lamp is currently on or was on and a delay fault of the camshaft adjust to current or stored in the engine control unit. Models 171, 203, 209…
- 10033075Dec 1, 2009Mercedes benz: check coolant protection level of the hybrid power electronics module and high voltage battery, correct if necessary. Model and my 164 2010.
- 10032587Sep 1, 2009Mercedes: update engine control module and selective catalytic reduction software. The software for the engine control module and selective catalytic reduction may not meet…
Engine cooling: other model years
Other parts of the 2009 Mercedes-Benz ML320
9 complaintsEngine
6 complaintsTransmission and drivetrain
4 complaintsAir bags
3 complaintsElectrical system
3 complaintsOther or unknown
3 complaintsBody and structure
3 complaintsBrakes
2 complaintsExterior lighting
1 complaintsLatches, locks and linkages
1 complaintsSuspension
1 complaintsTires
1 complaints
← All problems reported for the 2009 Mercedes-Benz ML320
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 30, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology