2009 Mercedes-Benz ML320 Fuel system Problems
- Complaints
- 9about this part
- Share
- 32%of 28 total for the year
- Median mileage
- 46,500miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 9 complaints about the fuel system of the 2009 Mercedes-Benz ML320, 32% of the 28 complaints for this model year. Where a mileage was given, the median is 46,500 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“Fuel pump failure. The car was towed to the dealer. This is the second fuel pump failure in the less than one year. During the 2 years of ownership, the car has had several problems with the engine starting, requiring multiple trips to the dealer for service. On many occasions the cause was not determined and the vehicle was returned with the problem unresolved. The vehicle was purchased new and serviced by the dealer,”
NHTSA complaint #10417319, filed 2011-07, 15,818 miles“Vehicle would not start after being parked for approximately 15 minutes. Towed to local mb dealer, diagnostics indicated fuel pump failure. Fuel pump replaced. Approximate mileage 64000. Vehicle failed to start on 4 other occasions over course of next 8 months. Twice the vehicle started the next day. Once the fuel pump relay was replaced. Vehicle failed to start again 10/10/14 and was towed to area mb dealer. Diagnostics indicated fuel pump failure again. Fuel pump was replaced again! Approximate mileage 145000. Waiting for it to leave me stranded again.”
NHTSA complaint #10667306, filed 2014-12, 64,000 miles“The contact owns a 2009 Mercedes-Benz ML320. After fueling the vehicle, the contact noticed that the vehicle was leaking fuel badly. The fire department removed some of the fuel before the vehicle was towed. The failure recurred four times. The vehicle was towed to a dealer where it was diagnosed that the fuel sender needed to be replaced. The vehicle was repaired; however, the failure recurred. The manufacturer was notified of the failure. The approximate failure mileage was 58,000.”
NHTSA complaint #10851411, filed 2016-03, 58,000 miles“The contact owns a 2009 mercedes benz ML320. The contact stated that fuel began to leak from under the vehicle while refueling. The contact also stated that the vehicle had its fuel filter replaced by an authorized dealer prior to refueling. The vehicle was towed back to the dealer and a fuel gasket was replaced. The failure recurred approximately two months later. The vehicle was again towed to the dealer to be repaired. The manufacturer was not made aware of the failure. The failure mileage was 30,000.”
NHTSA complaint #10446581, filed 2012-02, 30,000 milesRelated service bulletins
- 10167553Jul 1, 2013Combination message: "Clean fuel filter" is displayed. The fault code 162500 (water level message - Bosch) or P226997 (water level message - Delphi) or 171600 (filter load…
- 10032707Sep 10, 2009Mercedes: ensuring unobstructed movement for the fuel level sensor. When installing the left or right fuel level sensor, it is essential for it to have unrestricted, unobstructed…
- 10029105Apr 2, 2009Mercedes benz: fuel loss at pressure regulator valve and/or poor engine running characteristics (shakes, knocks, surges, changes to lip home mode, poor output, poor fuel economy…
Fuel system: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2009 | 9 | 32% |
| 2007 | 2 | 13% |
| 2005 | 1 | 20% |
| 2003 | 2 | 9% |
| 2002 | 2 | 2% |
| 2001 | 11 | 8% |
| 2000 | 16 | 10% |
| 1999 | 14 | 11% |
| 1998 | 20 | 15% |
Other parts of the 2009 Mercedes-Benz ML320
6 complaintsEngine cooling
4 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 Nov 1, 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