Most common 2003 Mercedes-Benz ML320 problems
Share of the 22 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
Mercedes-Benz ML320 complaints by model year
Best ML320 years: 2005, 2007, 2008. Years to avoid: 1998, 2000, 1999, 2001, 2002. Compare all years →
NHTSA defect investigations
Federal safety investigators have looked into a possible defect involving the 2003 Mercedes-Benz ML320:
Electric seat warmer overheats/burns
This investigation was opened based on three consumer complaints of electric seat warmer overheating in my 2003 Mercedes Benz ml-320 vehicles.consumers alleged that such failures May inflict burn injuries to seat occupants.investigation disclosed that the identical seat warmer design was installed in 65.5 percent of all m-class vehicles produced during my 2000-2005.the alleged defect resulted from breakage of the…
What 2003 Mercedes-Benz ML320 owners say
A/C & heater
Driver's seat heater shorted out while vehicle was being driven. The event ocurred so quickly and was so severe that it burned through the leather seat upholstery and a very heavy pair of denim jeans I was wearing almost imediately and unexpectedly. The consequences are pretty much obvious and could range from severe burns, to the vehicle burning to causing a serious accident because of the spontaneous happening. No response from Mercedes Benz to date.
While driving the vehicle heated seats caused second degree burns to the driver's bottom. There was no damage to the vehicle's seat. This problem also cause some redness to another driver's bottom. After visiting doctor for treatment of burns, took vehicle to dealer the same week. Was informed by three different mechanic's problem could not be found or resolved. "pictures enclosed" the vehicle seats were heated.
Steering
Loss of power steering fluid, it appears to be from the hose connection to the radiator during driving and while stationery. This issue was previously recalled, I believe twice. Dealer requested $125 diagnostic charge. Mb USA informed in a phone conversation, that this problem was already fixed October 2008 under recall, and the warranty expired and I should fix on my own cost.
Car makes a "washing machine" type nose when the steering wheel is turned. Mercedes dealer evaluated and found the steering gear box/rack & pinion is "worn" and should be replaced. Although dealer recommended replacement of part they did add a lubricant to power steering fluid to "eliminate" the noise (which is still there presently). Warranty company refuses to replace rack & pinion because they state part is still functioning as intended. However, if part completely fails and the steering goes out, I could be involved in an accident, possibly causing death or injury.
Brakes
My wife drove the vehicle to work one day and when she was pulling out of the parking lot onto a busy street, the yellow triangle with exclamation point started to flash and engaged the brakes. My wife quickly pull over to the side of the street and made her way back into the parking lot while the brakes where engaging. My wife was unable to drive the vehicle home from work. We let the vehicle sit for several minutes and I was able to get the vehicle moving but the brakes were engaging again. I was able to get the vehicle back home. I have taking the vehicle to several shops and all the shops are saying that there is an issue with the traction control system. When driving the vehicle from one of the shops, as soon as I pulled out of the shop's parking lot the brakes engaged and the yellow triangle with exclamation was flashing. …
Tl* the contact owns a 2003 Mercedes Benz ML320. While driving approximately 40 MPH, the brakes were engaged numerous times before there was a reduction in the speed. The contact smelled an unusual odor inside of the vehicle. In addition, on separate occasions a burning odor of brakes emitted throughout the vehicle while driving. The vehicle was taken to an authorized dealer who was unable to detect a problem. The manufacturer was notified of the problem. The approximate failure mileage was 30,000.
2003 Mercedes-Benz ML320 engines & fuel economy
| Engine | Transmission | Drive | MPG city / hwy / combined |
|---|---|---|---|
| 3.2L 6-cyl | 5-speed automatic | 4WD/AWD | 14 / 17 / 15 |
EPA ratings. Class: SUV.
Frequently asked questions
Is the 2003 Mercedes-Benz ML320 a good car?
Based on 22 owner complaints filed with NHTSA, the 2003 ML320 rates better than average: 68% fewer complaints than a typical year of the ML320 at the same age. Complaint counts don't account for sales volume or individual maintenance, so have any used car inspected before buying.
What is the most common problem with the 2003 Mercedes-Benz ML320?
The a/c & heater — 6 complaints, 27% of all complaints for this model year, most often about front assembly › seat heater/cooler. Next are the steering (6) and brakes (4).
How many recalls does the 2003 Mercedes-Benz ML320 have?
NHTSA lists no recalls for the 2003 Mercedes-Benz ML320. You can still confirm with your VIN using our VIN recall check.
What are the best and worst years of the Mercedes-Benz ML320?
The best years by complaints, compared at the same age, are 2005, 2007 and 2008. Years to avoid or approach with caution: 1998, 2000, 1999, 2001 and 2002. See the full Mercedes-Benz ML320 years comparison.
At what mileage do 2003 Mercedes-Benz ML320 problems happen?
The median mileage reported in complaints is about 52,000 miles; 47% of problems with a recorded mileage started before 50,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.