2007 Mercedes-Benz GL450 Problems

What owners report

Owners of this model year most often describe the driver's seat heater overheating, in some cases burning through the seat cover and clothing, and also report transmission problems where the vehicle stops shifting or drops into limp mode. The seat heater reports come at a wide spread of mileages, while the transmission complaints concentrate at higher mileages. Suspension complaints center on the air suspension dropping at one corner, and electrical reports include stalls and battery/starting faults.

1. 1
   Seats

   Seat heater overheating and burning the seat

   • 43 complaints (37%)
   • median 75,000 mi at 7.3 yrs old (40 state mileage)
   • 33 mention a crash, fire or injury
   • filed 2008–2025

   Owners describe turning on the driver's seat heater and, within a few minutes, smelling burning and feeling intense heat on the lower back or seat cushion. Several report a hole burned through the leather or fabric and burn marks on clothing, and some describe smoke filling the cabin or visible flame at the back of the seat. Where a cause was identified, a mechanic pointed to a fault in the heated seat element; in other cases the dealer could not diagnose the problem, and a few owners say the vehicle was not repaired. Reported from roughly 27,000 to 190,000 miles, often within a few minutes of switching the heater on.

   2 related service bulletins

   What to check: Test the driver's seat heater on a used example and watch for hot spots, discoloration or a burning smell, and check the seat upholstery for patched or replaced sections. A warranty extension on seat heaters was noted for earlier model years in a settlement document, so ask whether any related coverage applies to this vehicle.

   2 excerpts from owner complaints in NHTSA records

   “On november 17, 2020, I turned my driver seat heater and suddenly smelled something burning. After several minutes driving I decided to turn of the heater, the burning sensation on my back was intense. Once I parked, I noticed a hole in my seat the size of a quarter! I checked my clothing and noticed it melted the elastic part at the bottom my jacket.”

   NHTSA complaint #11375272, filed 2020-11, 96,382 miles

   “I was on my way to drop off my daughter for school. I started to smell something burning then I started feeling a burn on my seating area. I pulled over lucky I was next fire department, my daughter and I got off the car as we got off the drivers side seat was on fire. Every one from the fire department came out, they disabled the seat electrical system.”

   NHTSA complaint #10361103, filed 2010-10, 42,000 miles
2. 2
   Transmission and drivetrain

   Transmission will not shift, stuck gear or limp mode

   • 18 complaints (16%)
   • median 81,250 mi at 6.7 yrs old (18 state mileage)
   • 1 mention a crash, fire or injury
   • filed 2010–2022

   Complaints describe the transmission failing to shift into the intended gear, staying stuck in one gear, or dropping into a limp mode that limits speed until the engine is shut off and restarted. In several cases the dealer diagnosed the conductor plate, valve body or transmission control module and replaced parts; other owners were told the transmission needed replacement, and some report the problem returned. Mostly reported between about 45,000 and 145,000 miles, often during acceleration or highway driving.

   6 related service bulletins

   What to check: Drive the vehicle through all gears from cold and warm, including a highway pull and a stop-and-go stretch, and watch for delayed or harsh shifts or a limp-mode message. Ask whether the transmission conductor plate, valve body or control module has been replaced and whether any software update or bulletin work was done.

   2 excerpts from owner complaints in NHTSA records

   “I was driving home from work and my transmission began to not shift out of third gear going up a hill.. I took it to the dealer after this happened another 10 times and they said is a intake flap not closing properly and that they couldn't do anything about it. Now its happening so often im afraid to put my children in the car on account that every time it stops shifting when I'm in the middle of traffic and lose all power.”

   NHTSA complaint #10560172, filed 2014-01, 79,000 miles

   “My car battery died, roadside assistance jumped my car, mechanic replaced my batteries. The car started without problems, but then a message came up in my dashboard in red saying to drive the car to the workshop without shifting gears; after the mechanic checked the car and did some research he found that the intelligent servo module was bad; the card would not shift into gear. The vehicle was stationary with the engine running in the shop.”

   NHTSA complaint #11325388, filed 2020-05, 142,000 miles
3. 3
   Electrical system

   Stalls, sudden power loss and battery or starting faults

   Mentioned in 8 of 60 sampled complaints

   Complaints describe the engine shutting down without warning, sometimes at speed and sometimes at idle, with dashboard lights cycling and the engine restarting on its own or after a restart attempt. Others report battery drain, a no-start condition traced to the intelligent servo module, or an engine fire after the vehicle was parked; a few describe the liftgate failing to close or the horn sounding on its own. Spread widely, from roughly 1,000 to 190,000 miles.

   6 related service bulletins

   What to check: Check for stored fault codes and ask for battery and charging-system service records, and confirm the ignition and starting behavior after a cold soak. Have any intermittent stall or dashboard warning history explained before purchase.

   2 excerpts from owner complaints in NHTSA records

   “The ism (intelligent servo module) has failed in many of the similar mercedes cars that I own. I can not start the car and can not even order this part because only a dealer can install this part. My vehicle is stuck in a parking lot and there is nothing I can do. I think this issue needs to be recalled.”

   NHTSA complaint #10937786, filed 2016-12, 91,000 miles

   “My car was parked in the garage. 90 minutes later engine fire began that nearly burned down my garage and house. No problems were noticed in the car 60 minutes after parking. Fire occurred 60 to 90 minutes after parking.”

   NHTSA complaint #10425972, filed 2011-09, 48,000 miles
4. 4
   Suspension

   Air suspension drops at one corner or to the bump stops

   • 14 complaints (12%)
   • median 72,400 mi at 6.1 yrs old (12 state mileage)
   • 4 mention a crash, fire or injury
   • filed 2010–2024

   Owners describe the front or rear of the vehicle sitting low, sometimes only on one side, and a rough or bouncy ride. Some report a whistling or rumbling noise before the suspension dropped, and one owner found an air spring bag had ruptured. A warning message about the suspension appeared in several cases, and repairs were handled by the dealer or an independent shop. Typically reported between about 47,000 and 115,000 miles.

   1 related service bulletin

   What to check: Let the vehicle sit overnight and check whether it stays level on all four corners, then listen for the air compressor running repeatedly or noisily after startup. Ask about any replaced air springs, compressor or height sensors.

   2 excerpts from owner complaints in NHTSA records

   “2007 mercedes GL450 air suspension compressor all the sudden became noisy popped the hood to confirm noise and it was the air suspension compressor car was driving fine had to get to my destination only 2 miles away then all of the sudden boom I thought my tire blew out car started bouncing in the rear badly pulled over to check and the rear of the car was all the way down scaired the heck out of me got home crawled under car and the left rear air suspension bag blew apart completely no warning at all except the display on dash stated …”

   NHTSA complaint #10747324, filed 2015-08, 93,000 miles

   “Air suspension failure: initial failure - front end suspension failed - lowered completely where tires would appear to contact wheel well. Dealer 'fixed' problem second failure - left front air suspension lowered, the remaining three did not lower itself. The car drives at an odd angle with left front end pointing to the ground. Again the tire appears to make contact with the wheel well. Ride is rough.”

   NHTSA complaint #10408483, filed 2011-06, 55,000 miles
5. 5
   Brakes

   Brake pedal travel and reduced braking

   • 10 complaints (9%)
   • median 36,810 mi at 3.4 yrs old (7 state mileage, few)
   • 3 mention a crash, fire or injury
   • filed 2007–2023

   Owners describe the brake pedal going close to the floor, longer stopping distances, and in one case locking brakes with loss of steering assist in snow. Some were told by the dealer that the pedal feel was normal or had pads and rotors replaced at low mileage, while one owner whose vehicle had been inspected under a brake booster recall later reported the brakes failing to stop the vehicle. Reported from very low mileage, in some cases under 10,000 miles, up to around 190,000 miles.

   Recall 24V298000 · DO NOT DRIVERecall 22V315000 · DO NOT DRIVE1 related service bulletin

   What to check: Ask whether the brake booster recall work (campaigns 22V315000 and 24V298000) was completed and obtain documentation, and check pedal feel and stopping distance on a test drive. Look at pad and rotor condition and ask about any vibration while braking.

   2 excerpts from owner complaints in NHTSA records

   “Today my husband was involved in a car accident while driving my 2007 GL450. Thank god he wasn't injured but the situation he explained to me has happened several times before and I've been able to regain control of the car before something terrible happened. …”

   NHTSA complaint #10304549, filed 2010-02, 49,000 miles

   “2007 mercedes benz GL450, did all scheduled maintenance at dealer, only 36000 miles, the 'brake wear' message just came up on the console. Dealer checked and said all brake pads, front brake rotors need to be replaced. So only 36k miles and well maintained vehicle, when the brake sensor just indicated 'brake wear' problem, not only all pads are bad, but also the rotors were damaged already? It seems to be defect of brake system, including the brake sensor.”

   NHTSA complaint #10346236, filed 2010-07, 36,810 miles

Buying note. On this model year, the most useful checks are the driver's seat heater, the transmission's shifting behavior, and the air suspension's ability to hold ride height overnight, since those account for most owner reports. Also confirm that the brake booster recall work has been completed and review service records for any transmission or electrical repairs before buying.

Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.