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2012 Mercedes-Benz C-Class problems, recalls and owner complaints
What the 2012 Mercedes-Benz C-Class has been recalled for, how often it fails the UK MOT and what owners report, from official government data. Updated October 25, 2026.
- 0safety recalls
- 588owner complaints
- 8crash reports
- 7fire reports
- 30%fail the UK MOT
The most complained-about Mercedes-Benz C-Class year on file: 588 complaints, against an average of 159 for the other 14 model years.
Every Mercedes-Benz C-Class model year with its number of owner complaints. Pick a year to compare.
What goes wrong with the 2012 Mercedes-Benz C-Class?
The components named most often in the 588 owner complaints. One complaint can name several, so the shares can add up to more than 100%.
What symptoms do 2012 Mercedes-Benz C-Class owners describe?
Found by reading the text of all 588 owner complaints. Tap a symptom for the answer, a real owner quote and any related recall.
Has the 2012 Mercedes-Benz C-Class been recalled?
NHTSA lists no safety recalls for the 2012 Mercedes-Benz C-Class as of October 25, 2026. Recalls can be issued at any time, so check your VIN before you rely on this.
Is the 2012 Mercedes-Benz C-Class recalled in the UK or Europe?
Recalls issued by the UK's DVSA and through the EU's Safety Gate system that cover this model and build period. European models can differ from U.S. ones, and "years estimated" means the recall gave no build dates, so confirm your own car with your registration or VIN.
UK DVSAOn affected vehicles the panel located between the windshield and the panoramic sunroof might not have been bonded correctly during a…On affected vehicles the panel located between the windshield and the panoramic sunroof might not have been bonded correctly during a prior service repair.
Risk: On affected vehicles the panel located between the windshield and the panoramic sunroof might not have been bonded correctly during a prior service repair.
Fix: Check the front fixed element of the panoramic sliding sunroof and replace if necessary.
UK DVSAOn affected vehicles the aluminium bolts of the steering gear could corrode and break due to the intrusion of moisture.
Risk: On affected vehicles the aluminium bolts of the steering gear could corrode and break due to the intrusion of moisture.
Fix: Replace the steering gear mounting bolts on the affected vehicles with steel bolts. Should the bolts break or already be broken change the steering gear.
UK DVSAThe passenger air bag may not deploy as specified
Risk: The passenger airbag may not deploy as specified.
Fix: Replace the passenger airbag.
UK DVSAThe passenger air bag may not deploy as specified
Risk: The passenger airbag may not deploy as specified.
Fix: Replace the passenger airbag.
UK DVSAOne or more control unit vehicle configurations might not meet specifications
Risk: Vehicles configurations were written into one or more control units that might not meet specifications.
Fix: Update the configuration of the affected control units on the vehicles.
UK DVSATakata airbag might not deploy as specified
Risk: Certain climatic conditions may cause a chemical change to the airbag propellants over time.
Fix: Replace the driver and passenger airbags.
UK DVSATakata airbag might not deploy as specified
Risk: Certain climatic conditions may cause a chemical change to the airbag propellants over time.
Fix: Replace the driver and passenger airbags.
UK DVSAThe driver's air bag may have a chemical change to its propellant over time
Risk: The driver's airbag may have a chemical change to its propellant over time.
Fix: Replace the driver's airbag.
UK DVSAEngine control unit software to be updated
Risk: Improve the vehicle emissions via software updates.
Fix: Update the relevant control unit's software and if necessary replace the NOx sensors.
UK DVSACertain specific calibrations of functions must be changed in the engine management
Risk: Certain specific calibrations of functions must be changed in the engine management of the vehicles
Fix: Update the diesel engine control unit software
UK DVSAElectrical wiring in steering assembly may be insufficiently grounded
Risk: The steering column clock spring may break. This will cause warning messages to illuminate in the instrument cluster but in extreme instances it may cause the driver's airbag to deploy
Fix: .Affected vehicles will be recalled to be checked to ensure there is sufficient grounding of the steering components.
UK DVSAElectrical wiring in steering assembly may be insufficiently grounded
Risk: The steering column clock spring may break. This will cause warning messages to illuminate in the instrument cluster but in extreme instances it may cause the driver's airbag to deploy.
Fix: Affected vehicles will be recalled to establish sufficient grounding of the steering components
UK DVSASteering components may be insufficiently grounded
Risk: It has been determined that the steering airbag electrical components are insufficiently grounded. Failure of the steering column module clock spring could result in an inadvertent deployment of the driver airbag which may cause risk of injury to the driver and an increased risk of a potential collision.
Fix: On affected vehicles the manufacturer will fit a contact bridge to the outer race of the steering column top bearing which will provide correct grounding.
UK DVSAElectrical wiring in steering assembly may be insufficiently grounded
Risk: The steering column clock spring may break. This will cause warning messages to illuminate in the instrument cluster but in extreme instances it may cause the driver's airbag to deploy.
Fix: Affected vehicles will be recalled to establish sufficient grounding of the steering components.
UK DVSAElectrical wiring in steering assembly may be insufficiently grounded
Risk: The steering column clock spring may break. This will cause warning messages to illuminate in the instrument cluster but in extreme instances it may cause the driver's airbag to deploy.
Fix: Affected vehicles will be recalled to establish sufficient grounding of the steering components.
UK DVSAElectrical wiring in steering assembly may be insufficiently grounded
Risk: The steering column clock spring may break. This will cause warning messages to illuminate in the instrument cluster but in extreme instances it may cause the driver's airbag to deploy.
Fix: Affected vehicles will be recalled to establish sufficient grounding of the steering components.
UK DVSAElectrical wiring in steering assembly may be insufficiently grounded
Risk: The steering column clock spring may break. This will cause warning messages to illuminate in the instrument cluster but in extreme instances it may cause the driver's airbag to deploy.
Fix: Affected vehicles will be recalled to establish sufficient grounding of the steering components.
UK DVSAFaulty control unit may cause vehicle to perform outside specification
Risk: Where a control unit coding was updated in a workshop between 3 December 2016 and 5 December 2016 the coding may not correspond to the specification and may trigger unplanned action in the vehicle. The safety and emissions systems may not react as design intent.
Fix: Recall the vehicles that are likely to be affected and update the software in the corresponding control units.
UK DVSAFuel may leakYears estimated
Risk: The flange of the fuel filter may leak due to a non-compliance in the supplier's production process. Should this occur a fuel odour may arise or fuel escape.
Fix: Recall the vehicles that are likely to be affected to replace the fuel filter.
UK DVSAEngine may cut out
Risk: Cracks in the charge air hose may possibly occur. This may subsequently lead to the engine switching to limp-home mode. In rare individual cases the engine shutting off cannot be ruled out.
Fix: Recall the vehicles that are likely to be affected to replace the charge air hose.
UK DVSAFuel may leak
Risk: Fuel leaks in the plug area of the drain opening may occur at the fuel filter with integrated fuel heaters. Fuel can escape and is noticeable to the customer due to a corresponding diesel odour. The diesel can reach the road and as a result friction between the tyres and road surface may be decreased.
Fix: Check filter and replace as necessary.
EU Safety GateThe three aluminium screws of the steering box may corrode due to exposure to spray water and aggressive road-grit (salt) used for melting…The three aluminium screws of the steering box may corrode due to exposure to spray water and aggressive road-grit (salt) used for melting ice. Advanced corrosion could weaken the screws, leading to potential breakage during manoeuvring or parking. If all fixing screws fail, the power-assisted steering could detach, resulting in a loss of power steering and an increased risk of an accident.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateThe aluminium bolts of the steering box may break.This can lead to detachment of the steering box from the power block, creating a risk of an accident.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateFaulty configurations of the control units (traction systems, signal recording triggering modules, engine control units and headlights)…Faulty configurations of the control units (traction systems, signal recording triggering modules, engine control units and headlights) could cause one or more control units to malfunction, which could increase the risk of an accident. The exhaust emissions exceed the legal limits, posing a risk to the environment.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateThe polycarbonate roof panel located between the windscreen and the panoramic roof may not have been bonded correctly to the vehicle…The polycarbonate roof panel located between the windscreen and the panoramic roof may not have been bonded correctly to the vehicle during a prior repair. In such cases, the adhesive bonding could gradually deteriorate and the panel could become detached from the vehicle, posing a risk to other road users.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateThe driver and passenger airbags of the company Takata in vehicles with ammonium nitrate gas generators without drying agents could, under…The driver and passenger airbags of the company Takata in vehicles with ammonium nitrate gas generators without drying agents could, under certain climate conditions, lead over time to a chemical change in the fuel.In the event of an accident triggering the release of the driver or passenger airbag, this change could cause the gas generators to burst. If a gas generator ruptures, the airbag would then have no restraining function and loose parts from the gas generator could reach the vehicle interior. This would increase the risk of injury for passengers.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateThe steering column is not sufficiently earthed.As a result, in the event of an electrostatic discharge, the driver's airbag may be triggered when not required. This could cause an accident.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateFollowing the update of the control unit coding, the coding parameters of the control unit could be defective.This could give rise to various unplanned reactions in the vehicle: the wrong airbag could be triggered in the event of an accident, the airbag control unit may not recognise the belt buckle status, the engine control unit could be coded with a false maximum speed or various assistance systems may not function.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateThe power-assisted steering control units may have been fitted with defectively welded contacts.As a result, a permanent electrical connection between the contacts cannot be guaranteed, which could lead to loss of support to the power-assisted steering and thus an increased risk of accidents.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
How often does the 2012 Mercedes-Benz C-Class fail its MOT?
Why they failed: the share of failed tests with at least one fault in each area (a test can fail on several). Cars first registered in 2012, tested in Great Britain in 2023; first registration is usually, but not always, the model year. Source: DVSA anonymised MOT tests and results, Open Government Licence v3.0.
What do 2012 Mercedes-Benz C-Class owners report?
12 of the 588 complaints, the most recent for the most-reported components, as the owners wrote them. NHTSA removes names and VINs; long reports are trimmed. CarHooq has not verified individual claims.
Fuel leaking in the back seat of the car
Brake line corrosion issues, related and reported along with the sub-frame assembly corrosion. After getting the sub-frame repaired XXX, corrosion and deformation of the tie rods and control arms caused vibration and noise at speed, and while cornering. Repaired XXX and vehicle inspection discovered no leaks in the corroded brake lines. After this repair, brake fluid warning light appeared. Very costly repair done at the MB dealership, in [XXX]. This is a common defective issue associated with the corrosion of the subframe, and should be attached to the subframe campaign, and reimbursed by the…
The rear sub frame has rusted and part of it has failed
I have a rust free, relatively lower mileage car I bought for my teen daughter. Despite being such a clean car the rear subframe has rusted and rear suspension has broke off while driving, hitting the fuel tank and is unstable. We avoided an accident but the car is not drivable.
Mercedes of Danbury replaced the rear sub frame CODE 3441 47, since my mechanic (Newtown Auto Repair) told me that the Front subframe is in real bad shape, rotten/rusted, that it is dangerous to drive the car in this condition since the wheel and steering components are part and attached to it, the car would be out of control and all over the road any of these components fail and pull / brake away from the rusted out Sub Frame. When I brought the car in was under the impression that Mercedes Benz would replace front and back Sub Frames. But now they informed me of only recall on rear subframe…
The taillights in my 2012 c300 was starting to go out intermittently. At first the notification came on for the brake light but the brake light kept working. Afterwards the rest of the taillights and the sidemarker light went out as well. I went to go take a look and the grounding wire was oxidated and corroded. A known issue in which there was a recall made for the 2008-2011 version of the w204 but this did not apply to the 2012 w204. As of last week my entire rear drivers side light is out which is a safety hazard especially at night. The hazard lights dont work in case of an emergency on…
-The steering wheel and brake locked up and became unusable while driving at approximately 75mph. Cruise control was enabled for a few miles (maybe 2) and disabled after. Around 5 minutes after disabling, the car began to surge between acceleration and deceleration drastically on its own. All of the dashboard lights that come on when the key is initially inserted came on at once while engine was on/running and the car was in drive. After finally being able to reach a safe enough spot, I put the car in park and turned the engine off. I sat for a few minutes to try and turn the engine/car back…
Rear subframe rotted out and broke due to corrosion. Rear crossmember is broken and needs replaced. My safety as well as the safely of other was put at risk. Loss of control at high speed could have been deadly. Luckily, I wasn’t going very fast at the time of incident or else who knows what would have happened to me or bystanders. Independent service center inspected and confirmed that incident was due to corrosion in the rear. They informed me of the extended warranty (20 years, unlimited miles) on 2008-2015 C300 models for this particular issue as my safety and the safety of others was put…
The contact owns a 2012 Mercedes-Benz C250. The contact stated that while driving at an undisclosed speed, there was an abnormal rattling sound coming from the vehicle with the check engine warning light illuminated. The contact drove the vehicle to the shoulder of the road. The contact stated that the rattling sound continued, and the vehicle shuddered abnormally. The vehicle was towed to the residence. The independent mechanic provided mobile service and diagnosed the vehicle with cam shaft timing chain adjuster failure. The contact was informed that the cam shaft timing chain adjuster…
I was driving normally last week when the driver's head restraint system (known by Mercedes as Neck Pro) unexpectedly and without warning blew at my head. The noise was very loud, and the headrest slammed against my head. Luckily, I was driving approximately 20-25 miles per hour, daytime, on a residential street without too many other vehicles. I was able to pull over to investigate what happened and ensure I wasn't injured and did not collide with any objects in the road. If this had happened on the highway at highway speeds with a less attentive driver, I could see this potentially resulting…
The model/year Mercedes-Benz are well known for experiencing this/these particular issues. My research has shown that these year/make/model vehicles are experiencing the same type of mechanical failures nationwide. The issues all relatively begin around 75,000 miles. I've only had my car 3 years putting 30000 on it hardly driven/cared for **Issue Found:** Oil was leaking onto the ignition coil and spark plug of cylinder 3. **Source of Leak:** Valve cover gasket failure. **Recommended Repairs:** - Replace the valve cover gasket (to halt the oil leak). - Replace spark plugs and ignition coil…
The contact owns a 2012 Mercedes-Benz. The contact stated while driving at an undisclosed speed, the Check Engine and High Pressure Fuel Pump warning lights was illuminated. The failure occurred on several different occasions. The vehicle was taken back to the residence. The contact did research and was made aware of an unknown NHTSA Campaign Number however, the VIN was not included. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was unknown.
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2012 Mercedes-Benz C-Class: questions owners ask
Is the 2012 Mercedes-Benz C-Class reliable?
NHTSA data alone cannot rate reliability, but it shows what owners reported. Owners filed 588 complaints with NHTSA about the 2012 Mercedes-Benz C-Class; the most common categories were air bags (312, 53.1%), suspension (74, 12.6%), engine (69, 11.7%). There are no safety recalls listed for this model year. 8 complaints mention a crash, 7 mention a fire, 10 injuries were reported.
What are the most common problems with the 2012 Mercedes-Benz C-Class?
Across 588 owner complaints filed with NHTSA, the categories mentioned most often are air bags (53.1% of complaints), suspension (12.6% of complaints), engine (11.7% of complaints), structure (10.5% of complaints), fuel/propulsion system (5.1% of complaints). One complaint can name several components.
Does the 2012 Mercedes-Benz C-Class have any recalls?
As of October 2026, NHTSA lists no safety recalls for the 2012 Mercedes-Benz C-Class. Recalls can be issued at any time, so check your VIN at nhtsa.gov/recalls.
Does the 2012 Mercedes-Benz C-Class have rust or paint problems?
96 of the 588 owner complaints NHTSA has on file for the 2012 Mercedes-Benz C-Class (16.3%) describe rust, corrosion or peeling paint. One owner wrote: "Fuel tank is rusting. Leaking fuel, heavy fuel smell inside cabin. My saftey and anyone around the vehicle would be at risk due to fire chance." (NHTSA complaint 11763782, September 2026). If it happens to your car, check your VIN for open recalls at nhtsa.gov/recalls and report the problem to NHTSA; complaints are what trigger investigations.
Why is the check engine light on in my 2012 Mercedes-Benz C-Class?
28 of the 588 owner complaints NHTSA has on file for the 2012 Mercedes-Benz C-Class (4.8%) describe the check engine light coming on. One owner wrote: "During hard acceleration the high-pressure fuel pump fails. I've never had to replace this part on any other car that I have owned." (NHTSA complaint 11600868, July 2024). If it happens to your car, check your VIN for open recalls at nhtsa.gov/recalls and report the problem to NHTSA; complaints are what trigger investigations.
What causes a knocking, ticking or rattling noise in the 2012 Mercedes-Benz C-Class engine?
27 of the 588 owner complaints NHTSA has on file for the 2012 Mercedes-Benz C-Class (4.6%) describe a knocking, ticking or rattling engine noise. One owner wrote: "Faulty camshaft adjusters creating timing chain to stretch and tensioners to fail , causing excessive wear to the crankshaft and wear of the teeth resulting in catastrophic damage and complete engine failure ( I have not replaced this timing chain or camshaft…" (NHTSA complaint 11489131, October 2022). If it happens to your car, check your VIN for open recalls at nhtsa.gov/recalls and report the problem to NHTSA; complaints are what trigger investigations.
Check your own C-Class
Counts are a starting point, not a verdict: popular models collect more complaints because more of them are on the road, and NHTSA does not verify individual reports. To see whether a recall is still open on your car, enter your VIN at nhtsa.gov/recalls (U.S.) or your registration at check-vehicle-recalls.service.gov.uk (UK). Had a safety problem? Report it to NHTSA; complaints are what trigger investigations and recalls.
Data: NHTSA Office of Defects Investigation recall and complaint databases (public domain), DVSA anonymised MOT results (Open Government Licence v3.0), DVSA vehicle recalls (Open Government Licence v3.0), EU Safety Gate alerts (© European Union), retrieved October 25, 2026. Model year 2012 only.