Tl* the contact owns a 2005 Mercedes benz c230. The contact was driving approximately 60 MPH when the check engine warning light illuminated. The warning light remained illuminated until the engine was shut off. The vehicle was taken to an authorized dealer for diagnosis. The technician informed the contact that the camshaft solenoid had leaked oil into the engine wiring harness and control…
2005 Mercedes-Benz C-Class engine problems
severe 18 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
18
Recalls
0
Avg fix
$3,100
2fires
When does it fail?
Of the 18 engine complaints filed for the 2005 Mercedes-Benz C-Class, here's the actual mileage breakdown — failures cluster heaviest at 0-25,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
No new NHTSA engine complaint has been filed on this vehicle in over 15 years — the issue may be aging out of the active population.
The failure pattern owners describe
Owners of 2005 Mercedes C-Class (and related models) report severe, recurring engine problems that dealers struggle to diagnose or permanently fix.
Timing chain and cam gear failure is the most damaging: soft-metal cam sprockets wear prematurely or break around 50K miles. When the timing chain jumps, it destroys the engine—valves and internal components are damaged beyond repair. Replacement engines run $10,000–15,000. Mercedes has not issued a recall.
Ignition coils fail repeatedly. Coil #2 is frequently cited as burning out and being replaced multiple times, yet the problem returns within hours or days. Spark plugs foul in the process. One dealer even loaned a vehicle with identical coil issues, then returned it within hours.
Unexpected engine stalling without warning occurs at various speeds and mileages. Sometimes the car restarts immediately; other times it requires towing. Dealers have visited eight times or more without pinpointing the cause. When a crankshaft position sensor is replaced, the fix doesn't always stick.
Two owners reported engine fires—one starting with dark smoke in the cabin that escalated to full engulfment, the other preceded by a gas smell. Both were total losses.
A supercharged M271 motor had a defective check valve allowing pressurized air into the crankcase, pushing oil back and causing misfires. A repair campaign existed but did not cover some 2005 VINs. Cylinder head failures causing compression loss and loss of power are also reported, with the problem recurring years after remanufacture.
Same Mercedes-Benz C-Class engine reports on nearby years: 2006 · 2007 · 2008
Failure modes owners describe
Timing chain/cam sprocket premature wear and jumping
Soft metal cam gears wear prematurely or break, causing the timing chain to jump. This destroys the engine by damaging valves and internal components. Owners report the chain stretches beyond safe limits around 50K miles. Mercedes used thin timing chains and unhardened soft-metal sprockets, leading to catastrophic failure.
When: 50,000–135,000 miles
Symptoms owners cite: Engine vibration followed by sudden stalling; Check engine light illuminated; Engine will not restart
Repairs/costs cited: Full engine replacement $10,000–15,000; cam gears $900 each, timing chain $330, plus labor and any other damaged components
Recalls/TSBs owners mention: No open recall or class action suit; Mercedes recommended dealership evaluation but did not offer repair assistance or coverage
Cylinder head failure and compression loss
Cylinder heads fail prematurely, causing loss of compression in the cylinders. Owners report the heads were remanufactured once, but the same failure recurred two years later. Mercedes denied awareness of any such problems with the year/make/model.
When: 104,000 miles reported; recurring within 2 years of repair
Symptoms owners cite: Vehicle shaking and loss of power while accelerating; Cylinder misfiring
Repairs/costs cited: Cylinder head remanufacture required; problem recurred after repair
Recalls/TSBs owners mention: Mercedes stated they have not heard of any problems with this particular year/make/model; no recall or warranty program offered
Ignition coil defect and spark plug fouling
Ignition coils fail repeatedly, often burning out. When replaced, the problem recurs within hours or days. Coil #2 is specifically mentioned as failing multiple times. Spark plugs also foul and require cleaning or replacement, but the underlying coil defect persists despite dealer repairs.
When: Multiple failures and repairs over short intervals
Symptoms owners cite: Hesitation upon acceleration; Loss of power while driving; Engine shaking and stumbling after restart; Check engine light illuminated; Engine sounds like it will blow up; Vehicle stalls and becomes undriveable
Codes mentioned: Coil defect code
Repairs/costs cited: Coil #2 replaced multiple times; spark plugs cleaned or replaced; problem recurs within hours or days despite repairs
Unexpected engine stalling without warning
Engine stalls without warning at various speeds (5–60 mph). Stalling may occur while accelerating, reversing, or at low speed. Sometimes the vehicle restarts immediately; other times it requires towing. Dealers have been unable to accurately diagnose or fix the problem after multiple visits.
When: Various mileages: 34,253 miles, 84,500 miles, and others unreported
Symptoms owners cite: Engine stalls without warning while driving at any speed; Difficulty restarting or requires towing; No ignition initially on some cold starts; Check engine light may or may not illuminate
Codes mentioned: Crankshaft position sensor fault
Repairs/costs cited: Crankshaft position sensor replacement; repairs were not effective in all cases, with problem recurring or not accurately diagnosed
Recalls/TSBs owners mention: No recalls reported; Mercedes offered no assistance; dealers unable to duplicate failure or determine root cause
Camshaft solenoid oil leak into wiring harness
Camshaft solenoid leaks oil into the engine wiring harness and engine control module, causing check engine light and potential electrical damage.
When: 47,668 miles
Symptoms owners cite: Check engine warning light illuminated
Repairs/costs cited: Camshaft solenoid and wiring harness repair required
Supercharger check valve defect (M271 motor)
Check valve on the supercharged M271 motor is defective, allowing pressurized air to enter the crankcase and push oil back into the engine. This causes misfiring, loss of power, and check engine light. Owner identified matching campaign 2008020002, but their 2005 VIN was not covered despite the campaign supposedly covering 2003–2005 models.
When: Mileage not stated
Symptoms owners cite: Misfire reading; Loss of power; Check engine light illuminated
Codes mentioned: Misfire code
Repairs/costs cited: Campaign 2008020002 repair would address the issue, but owner's VIN was not included in coverage
Recalls/TSBs owners mention: Campaign 2008020002 (2003–2005 range) exists but does not cover owner's 2005 VIN; repair not covered
Intermittent power loss on acceleration
Vehicle loses power intermittently during acceleration, particularly within the first 5–10 minutes of driving. Multiple owners report the same issue with the same model. Service has been unable to find the root cause.
When: First 5–10 minutes of driving
Symptoms owners cite: Loss of power followed by regaining power; Occurs during acceleration
Repairs/costs cited: Service unable to identify or repair problem
Engine fire
Engine caught fire while driving without warning. One incident started with black/dark smoke from the engine bay entering the cabin, escalating to full engine and front-end engulfment within minutes. Another fire started after driver smelled gasoline while driving. Both fires resulted in total vehicle loss and posed serious safety risk to occupants.
When: Highway driving; no mileage stated
Symptoms owners cite: Dark smoke from engine bay escalating in intensity and color; Smoke entering cabin, causing disorientation; Flames engulfing engine and front end; Gasoline smell preceding fire in second incident
Repairs/costs cited: Total vehicle loss; vehicles burned to bare metal
Black smoke and soot from exhaust (diesel models)
2005 E320 CDI diesel emits black smoke intermittently and black tar-like soot pours from the exhaust system. Mercedes stated the car is operating within factory specifications; dealership blamed poor quality fuel. Issue persists and owner considered legal action under lemon law.
When: Intermittent throughout ownership
Symptoms owners cite: Black smoke from exhaust; Black soot/tar pouring from exhaust system
Repairs/costs cited: No repair attempted; issue blamed on fuel quality by dealership
Recalls/TSBs owners mention: Mercedes stated car is operating within factory specifications; dealership blamed poor diesel fuel quality
Synthesized from 18 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 3 most recent
Vehicle was leaking transmission fluid, and air pressure was defective all of these defects were discovered by the dealer. After the vehicle was serviced it would not start.*ak
I have had 2 instances where I start driving and the car loses power and then will regain power. It is within the first 5-10 minutes of driving and is extremely dangerous and could cause accidents. Service has not been able to find problem. 4 other friends have indicated they are having the same problem with loss of power. Most are the same model. *jb
Had engine trouble with your 2005 Mercedes-Benz C-Class?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2005 Mercedes-Benz C-Class?
It's a meaningful issue. 18 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $3,100.
At what mileage does the engine typically fail?
Across the 15 complaints that reported odometer mileage, most engine failures cluster between 20,000 and 104,000 miles, with the median around 56,000. A quarter of owners report trouble before 20,000; a quarter make it past 104,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2005/Mercedes-Benz/C-Class.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.