2008 Mercedes-Benz C300 Problems

What owners report

Owners of this model year most often describe electrical and starting problems, especially a steering lock / ignition switch failure that leaves the car unable to start with the battery in good condition. Rear tail light assemblies and their wiring connectors also come up repeatedly, in some cases with melting and warning messages on the dash. Air bag recall notices, including Takata inflator campaigns, appear frequently in complaints, usually as frustration over parts availability rather than a new fault.

1. 1
   Electrical system

   Car will not start (steering lock / ignition switch)

   • 241 complaints (36%)
   • median 81,000 mi at 7.9 yrs old (211 state mileage)
   • 5 mention a crash, fire or injury
   • owner-quoted repair $1,200 (median of 67 quotes)
   • filed 2009–2025

   Owners describe parking the car and returning to find it will not start, with no starter sound even though the battery checks out, lights work, and the doors lock and unlock normally. In some cases the steering wheel is seized or a message to remove the ignition key appears. Complaints say dealers diagnosed the electronic steering lock and, in some cases, the electronic ignition switch, and quoted repairs in the four-figure range; several describe the diagnosis as a known pattern on this model. Reported across a wide mileage range, from about 34,000 to 180,000 miles, and often with no warning beforehand.

   1 related service bulletin

   What to check: Before buying, start the car several times from cold and check that the steering wheel unlocks freely and no key or steering messages appear. Ask whether the steering lock or ignition switch has ever been replaced and keep records of any repair.

   2 excerpts from owner complaints in NHTSA records

   “My car would not start, but the key turned over. I had it towed and was told it was the electronic steering lock, and mercedes benz dealership was the only one that can repair it. I was told that a technical service bulletin was issued for this part. I had the car towed to the dealership. I did research and saw that hundreds of cars of the same model had a problem with this part. …”

   NHTSA complaint #10672796, filed 2015-01, 55,000 miles

   “I drove car to work in the a.m. When I got ready to leave for the day the car would not start. The lights and locks and radio worked, but the engine wouldn't turn over. It was towed to the dealership and has been there for a few days. Just got a call that they think it is both the eis and esl, but they need my second key to be sure. After reading multiple forums with this problem, and calling another dealership, it seems the real issue my only be the esl. …”

   NHTSA complaint #10677108, filed 2015-01, 160,000 miles
2. 2
   Air bags

   Air bag warning light and open recall repairs

   • 349 complaints (52%)
   • median 78,000 mi at 8.2 yrs old (141 state mileage)
   • 14 mention a crash, fire or injury
   • owner-quoted repair $1,300 (median of 41 quotes)
   • filed 2009–2025

   Many complaints center on the SRS warning light coming on, sometimes intermittently and sometimes staying on, along with notices for driver and passenger air bag inflator recalls. Owners describe long waits for parts, being turned away after scheduling, and in some cases being told a wiring harness must be repaired at their own cost before the recall work can be done. A few complaints describe air bags not deploying in a collision. Reported from very low mileage up to past 150,000 miles, and largely tied to recall notices received over several years.

   Recall 16V081000Recall 16V363000Recall 15V711000Recall 17V0170005 related service bulletins

   What to check: Ask for written confirmation that all open air bag recalls have been completed, and check that the SRS light goes out after the bulb check when the ignition is turned on.

   2 excerpts from owner complaints in NHTSA records

   “We have been waiting since the start of the NHTSA recall of Mercedes-Benz c300s for faulty airbags for the appropriate replacement. I believe this has been about two years since we received our first notice. Last week we received a notice from our dealership that the part was in and that we should schedule our free repair. However, today, when my husband brought the car in for service he was told that the part was not available. …”

   NHTSA complaint #11163656, filed 2018-12, 68,500 miles

   “Takata recall: I have air bag recall 3 times: feb 11, 2016, may 25, 2016, jan 10, 2017 but when I contacted my mercedes benz dealer 5 times, they said the airbag replacement hasn't arrived on all the times I called. Feb 11, 2016: it's driver-side front airbags defect related to takata psdi-5 inflators. May 25, 2016: passenger-side front airbags takata pspi-2 inflators. Jan 10, 2017: passenger-side front airbags defect related to inflators.”

   NHTSA complaint #11045520, filed 2017-11, 75,000 miles
3. 3
   Exterior lighting

   Tail light failure and melted wiring connectors

   • 95 complaints (14%)
   • median 70,000 mi at 6.1 yrs old (86 state mileage)
   • 10 mention a crash, fire or injury
   • owner-quoted repair $500 (median of 11 quotes)
   • filed 2011–2025

   Owners report dash warnings for rear tail, brake, or turn signal lamps that keep returning after bulbs are replaced. On inspection, the harness plug or socket inside the tail light assembly is often found blackened, melted, or burnt, and in some cases a burning smell is noticed. Complaints describe water inside the light housings in a few cases, and mention that replacement parts are the same design, so the problem comes back. Typically reported between roughly 35,000 and 150,000 miles, and the warnings can appear whether the car is parked or moving.

   Recall 14V1770002 related service bulletins

   What to check: Check that all rear lamps work and look for darkened or deformed connector plugs inside the tail light housings. Ask whether the tail light recall work was done and whether any harness or socket has been replaced.

   2 excerpts from owner complaints in NHTSA records

   “My 2008 C300 had the right tail break light + rear right turn signal light error message these few days, I replace the light bulbs which did not fix the problem then I found the brown wire at connector melt badly, I google this issue on the web and found all 2008/2009 mercedez c class has the same issue, can we get a recall to fix it on this ?”

   NHTSA complaint #11321201, filed 2020-04, 140,000 miles

   “I received messages on my dash stating to check rear left turn signal and rear left tail/brake lamps. Upon pulling out the rear left (driver's side) tail light assembly, which holds all the bulbs, I noticed that the tail lights would flash when I jiggled the wires but not stay on. …”

   NHTSA complaint #10511033, filed 2013-05, 86,949 miles
4. 4
   Exterior lighting

   Headlight wiring and intermittent lighting faults

   • 52 complaints (8%)
   • median 88,000 mi at 8.1 yrs old (43 state mileage)
   • 3 mention a crash, fire or injury
   • filed 2011–2025

   Complaints describe headlights and other exterior lamps that stop working, with burnt or melted wiring found inside the headlight assemblies. Some owners report lamps that illuminate on their own while the car is parked, and others mention turn signals and wipers cutting out until the car is restarted. Dealers were reported as unwilling to cover the repair outside warranty. Mostly reported between about 25,000 and 125,000 miles, with some faults appearing intermittently over months.

   Recall 14V177000Recall 22V1680003 related service bulletins

   What to check: Inspect headlight connectors and wiring for discoloration or melted insulation, and test all exterior lamps, turn signals, and wipers during a test drive. Ask whether any lighting control work or software updates were performed.

   2 excerpts from owner complaints in NHTSA records

   “Turn signals and wipers / windshield washers cease to operate until car is restarted. Wipers continue to operate in rain sensing mode but not via the wiper control level. Dealer was not able to find any diagnostic codes afterward. Failure recurred a few days after dealer inspection, and occurs sporadically both in urban and highway driving. Time between failure ranges from hours to multiple months.”

   NHTSA complaint #10399422, filed 2011-05, 28,000 miles

   “Headlights not working because of faulty, burnt wires. Mercedes will not honor warranty. Said wires are covered but not headlight although the wires are inside headlight and caused the lights to stop working. Happened on both my headlights.”

   NHTSA complaint #10523342, filed 2013-07, 71,000 miles
5. 5
   Steering

   Rear subframe corrosion and cracking

   Mentioned in 5 of 60 sampled complaints

   Owners describe the rear of the car feeling unstable, rattling, or veering to one side under braking, traced by shops to a rusted or broken rear subframe, in some cases with the mounting points torn loose. Complaints say the car can become hard to control until repaired, and that the subframe was replaced once diagnosed. Reported mostly between about 72,000 and 250,000 miles, generally on older cars in rust-belt use.

   What to check: Have the car put on a lift and inspect the rear subframe and its mounting points for rust, perforation, or cracks, especially on cars from areas that use road salt.

   2 excerpts from owner complaints in NHTSA records

   “Stepped on the brakes and the car veered sharply to the right. Vehicle felt very unstable. Would of been horrible if the surface was snow covered or icy. Took into a repair facility and found out the rear subframe has rusted to the point of failure. The rear tire could move several inches. Somebody could be killed or severely injured.”

   NHTSA complaint #11398791, filed 2021-03, 105,000 miles

   “Failure of rear subframe at passenger side connection to the lower thrust arm/trailing link that transmits force from wheel carrier to car frame. The bracket portion of the rear subframe for this connection tore loose at the weld to the carrier, possibly during moderate acceleration at an at-grade railroad crossing in downtown St Paul, MN. This occurred on 8/12/21 at roughly 4:15 in the afternoon. …”

   NHTSA complaint #11429522, filed 2021-08, 120,000 miles

Buying note. Look for a car with documented completion of the air bag recalls and ask specifically about the steering lock and ignition switch, since those starting failures are the most common complaint here. A pre-purchase inspection that includes the rear subframe and the rear light connectors is worthwhile on an older example.

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.