Common problems of the Mercedes ML350 include rough automatic transmission shifting, a faulty camshaft adjuster solenoid causing the Check Engine line to turn on, intermittent loss of power steering, and rapidly cycling door locks. Repairpal.com publishes these and other common issues with the ML350 based on user reports.
Mercedes ML350 vehicles with seven-speed automatic transmissions commonly develop shifting problems between the first, second and third gears. The vehicle's transmission needs to be disassembled to repair this defect, which occurs at an average mileage of 66,786, with a wide range of discrepancy. Drivers have reported this problem with as few as 3,000 miles or as many as 189,000.
A faulty camshaft adjuster solenoid affects the ease of driving the Mercedes ML350, causing the Check Engine light to turn on after a reported average of 80,839 miles. The mileage discrepancy for this issue is also large, with reports of this failure occurring after as few as 9,948 miles or as many as 184,000.
Another common issue with the Mercedes ML350 is loss of steering fluid due to a leak in the power steering rack. To repair this, have an auto repair mechanic replace the rack assembly.
The electrical switches of the Mercedes ML350's door locks commonly fail. This causes the locks to actuate rapidly, locking and unlocking the doors whenever activated. To repair this issue, replace the affected latches.