2007 Mercedes-Benz C230 Problems

What owners report

Owners of this model year most often write about two things: a strong fuel smell after filling the tank, and transmission episodes where the car stays in a low gear or loses power until it is shut off and restarted. Both are described as intermittent and often recur, and a smaller group of reports covers engine timing/balance shaft noise and airbag warning lights.

1. 1
   Transmission and drivetrain

   Transmission stuck in low gear / limp mode, resets on

   • 54 complaints (25%)
   • median 66,000 mi at 7.2 yrs old (47 state mileage)
   • 1 mention a crash, fire or injury
   • owner-quoted repair $2,000 (median of 13 quotes)
   • filed 2010–2025

   Owners describe the car refusing to shift out of first or second gear, high engine rpm without road speed, harsh jerking when shifting into park, and sometimes a loss of power at speed. Many say turning the car off and restarting restores normal operation until it happens again. Dealers and shops commonly diagnosed the conductor plate or transmission speed sensor inside the valve body, the transmission control unit, or a mass air sensor first, with repair bills in the four-figure range according to complaints. Several owners report the dealer describing it as a known pattern. Spread widely, from under 3,000 miles to about 184,000 miles, with many reports in the 40,000-90,000 mile range; often at a stop, on a ramp, or while accelerating into traffic.

   3 related service bulletins

   What to check: Ask for service records showing whether the transmission conductor plate, speed sensor or control unit was replaced, and take a test drive that includes several stop-and-go accelerations from a dead stop to check for delayed or missing shifts.

   2 excerpts from owner complaints in NHTSA records

   “I purchased a 2007 mercedes benz C230 sport from a private seller. I soon learned that the vehicle was in limp mode. The dealer said it was the transmission conductor plate. After hours of research, I discovered several owners of a mercedes with the 772.9 transmission have been experiencing the same issue. I ended up paying $2500 for a new tcu from mercedes benz.”

   NHTSA complaint #11360040, filed 2020-09, 184,000 miles

   “While driving my car on sunday (8 june 2014), my 2007 mercedes benz C230 lost acceleration and the car wouldn't get out of first gear and the RPM's were running high. I had to pull over and turn the car off hoping to reset the car to that I could get back home. Once I turned off the car and set for a few minutes it then worked with no problem. This isn't the first time thig has happen to the car.”

   NHTSA complaint #10598020, filed 2014-06, 92,000 miles
2. 2
   Fuel system

   Fuel smell after refueling (fuel tank/sending unit seepage)

   • 59 complaints (28%)
   • median 77,501 mi at 8.2 yrs old (48 state mileage)
   • owner-quoted repair $850 (median of 6 quotes)
   • filed 2008–2024

   Complaints describe a strong gasoline odor inside the cabin or around the rear of the car after the tank is filled, often noted once the tank is above roughly three-quarters full and fading as fuel is used. Several owners report that removing the rear seat access panel revealed fuel residue or wet seals at the pump and sending unit, and dealers or mechanics diagnosed a cracked sending unit or pump housing, a failed canister shut-off valve, or a tank needing replacement. Some owners note no visible puddle under the car. A few reports also mention fuel gauge readings that do not match the actual fuel level. Reported from around 15,000 miles into the 180,000-mile range, most commonly after a fill-up and noticed while the car sits, for example in a garage.

   1 related service bulletin

   What to check: Smell the cabin and the area around the rear wheel wells right after a fill-up, and ask whether the fuel pump/sending unit seals or the tank have been replaced. A service bulletin describes checking the fuel level sensor circuit when the gauge does not match the actual fill level.

   2 excerpts from owner complaints in NHTSA records

   “When I fill up with gas, the car salon fills up with the gas smell. The problem should be in the fuel pump or so. The smell is persistent in the garage. While driving, I did not notice. When the amount of gas in the fuel tank decreases, the smell goes away. I removed the back seat and so the gas residue over the pump.”

   NHTSA complaint #11331122, filed 2020-06, 88,000 miles

   “I believe this is related to NHTSA action number ea13003. There appear to be complaints by others as well for the 2007 C230 regarding this issue. Basically, whenever I fill up my tank, I smell gas outside of the car, not inside. The smell seems to be strongest at the right side passenger mirror door area near the hood of the car. Then after a gallon or two has been used, the smell goes away. …”

   NHTSA complaint #10730266, filed 2015-06, 15,000 miles
3. 3
   Air bags

   Airbag warning light on, or airbag not deploying

   • 49 complaints (23%)
   • median 106,500 mi at 10.3 yrs old (16 state mileage)
   • 7 mention a crash, fire or injury
   • filed 2007–2024

   Owners report the SRS warning light illuminating while driving, and in a few cases airbags failing to deploy in a collision or deploying in the absence of an impact. Complaints describe trips to the dealer for the airbag recall, with some owners saying parts were unavailable or that a diagnostic charge applied. A few owners mention receiving recall notices and waiting for the repair to be completed. Reported across a wide mileage span, from a few thousand miles on nearly new cars to around 123,000 miles; some tied to a collision.

   Recall 16V0810004 related service bulletins

   What to check: Check that the SRS light goes out after the self-test at startup and confirm with a dealer, using the VIN, whether the driver-side airbag inflator recall has been completed.

   2 excerpts from owner complaints in NHTSA records

   “I was on the freeway driving to work with a co-worker when the passenger side airbag in my 2007 C230 deployed. There was not a collision or contact with my vehicle at all. The bag on the passenger side arm rest struck my passenger right arm quite violently causing her pain for 4 days and the drivers side airbag constricted and put a 4 inch cut on my neck. …”

   NHTSA complaint #10229692, filed 2008-06, 2,543 miles

   “There are issues with the engine and the car will not start. There's a class action against mercedes in regards to this same engine issue. The car was in motion when it cut off and another time after being stationary the car would not start. There was never a check engine light or any signs that indicated engine issues before the engine completely failed. I also received a notice about my airbag having a recall about a year ago and this issue has not been resolved.”

   NHTSA complaint #10979581, filed 2017-04, 129,000 miles
4. 4
   Engine

   Engine warning light with balance shaft / camshaft timing

   • 64 complaints (30%)
   • median 81,000 mi at 7.4 yrs old (40 state mileage)
   • 3 mention a crash, fire or injury
   • owner-quoted repair $5,833 (median of 9 quotes)
   • filed 2007–2024

   Complaints describe the check engine light coming on with codes indicating camshaft timing retarded or referencing the balance shaft, and some owners report vibration, a ticking or rattling sound, or an engine that cut off and would not restart. Independent shops and dealers identified the balance shaft, balance shaft sensor/solenoids, or the camshaft as the cause, with quoted repairs of several thousand dollars in some reports. One owner notes a warranty program/settlement concerning balance shaft sprocket replacement. Reported from roughly 32,000 to 130,000 miles, in a number of cases shortly after purchase of a used example.

   2 related service bulletins

   What to check: Scan for stored engine codes before buying and ask if the balance shaft or camshaft timing components have been serviced; a warranty program on balance shaft sprocket replacement is documented in service materials.

   2 excerpts from owner complaints in NHTSA records

   “Balance shaft is bad mercedes wants $5833 to fix it now they have a class action lawsuit against them for that they should have to pay the whole amount to fix it as I looked for recall I found the problem for my gas tank that should have been recalled to if you fill the car up you can smell gas need help to fix this”

   NHTSA complaint #10716862, filed 2015-05, 112,261 miles

   “We have a 2007 mercedes benz C230 sport. Shortly after purchasing this vehicle used with 32000 miles on it we started having balance shaft problems. Since then we have had the balance shaft sensor, and magnets replaces along with the crank case sensor. The vehicles check engine light is still coming on and we are now being told the balance shaft solenoids need to be replaced as well.”

   NHTSA complaint #10422948, filed 2011-09, 38,315 miles
5. 5
   Electrical system

   Electrical faults: no-start, key programming, fuse box and

   • 32 complaints (15%)
   • median 80,000 mi at 7.5 yrs old (28 state mileage)
   • 6 mention a crash, fire or injury
   • filed 2007–2026

   Complaints describe the car not starting, keys that could not be programmed, a relay/fuse box in the engine compartment that melted with a burning plastic smell, and instrument or COMAND display problems. Owners report dealers replacing keys or control modules and, in one case, attributing a no-start to low temperature. Some repairs were not completed or were disputed. Mostly reported between about 99,000 and 166,000 miles, with one fire-related report around 123,000 miles.

   3 related service bulletins

   What to check: Test that both keys start the car and that all displays and interior electronics work, and look for signs of heat or melting around the underhood relay/fuse box.

   2 excerpts from owner complaints in NHTSA records

   “Came to my car one day after it sat for maybe an hr at my mechanics house the doors unlocked with remote, went to srart car and it did not a make unlock vibrating sound after that realized it was not working, spent 400 dollars each on two different keys both of those did not work, techs had issue orogramming key”

   NHTSA complaint #11397161, filed 2021-02, 166,000 miles

   “Relay/ fuse box in engine compartment caught on fire after I drove home from work I parked and entered my home. I returned to my vehicle and smelled a strong plastic burning smell immediately with concern opened the hood and found my relay/fuse box and wiring from under all melted severely. Called mercedes bens and towed it right away. The dealer ship is trying to hold me responsible for damages that I strongly believe is a factory defect. I need help in this matter”

   NHTSA complaint #11014528, filed 2017-08, 123,000 miles

Buying note. Check for a fuel odor right after a fill-up and drive the car through several stop-and-go starts to see whether the transmission shifts cleanly, since those two patterns account for most of what owners report. Ask for records of conductor plate, fuel pump and balance shaft work, and confirm recall completion with a dealer using the VIN.

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.