Tl* the contact owns a 2007 Mercedes benz s550. The contact stated that while driving at 45 MPH, the vehicle began to loose power and suddenly stalled without warning. The vehicle was taken to a dealer where it was diagnosed that the conductor plate and valve body failed and needed to be replaced. The vehicle was repaired but the failure recurred at 100,000 miles. The manufacturer was not…
2007 Mercedes-Benz S-Class powertrain problems
severe 14 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Failure mileage
Complaints
14
Recalls
0
Avg fix
$2,500
1fire
When does it fail?
Of the 14 powertrain complaints filed for the 2007 Mercedes-Benz S-Class, here's the actual mileage breakdown — failures cluster heaviest at 25,000-50,000 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
Of the 6 model years of Mercedes-Benz S-Class we track for powertrain problems, this one carries the most owner complaints on file — 14.
Powertrain accounts for 22% of all owner complaints filed against this vehicle, across 6 categories tracked.
The failure pattern owners describe
The 2007 S-Class powertrain—particularly the 7-speed automatic transmission—generates consistent owner complaints across multiple distinct failures. The most severe and frequent issue is transmission limp mode or failure to shift: the car gets stuck in a single gear (often 6th), loses all pulling power, and will not respond to throttle input. The only fix is to shut the engine off, wait a few seconds, and restart. This happens repeatedly—one owner reported it 10 times in three months—and creates acute danger on highways and during traffic merges.
A second pattern involves unresponsive accelerator pedal: the driver presses the throttle, engine RPMs climb, but the car barely creeps forward at 1–5 mph or does not accelerate at all. These incidents strand drivers in heavy traffic and force oncoming vehicles to brake hard. A restart temporarily clears the fault.
A third pattern is rough, jolting transmission shifts, especially on hills or after parking on inclines, with the car sometimes stalling and refusing to shift until restarted. A fourth involves sudden transmission stall and whining noise, leading to complete failure.
One owner reported an oil leak from the rear of the engine causing fires and smoke underneath the vehicle. Owners consistently note that dealers cannot diagnose the underlying cause, and Mercedes has not issued a recall despite widespread complaints. One lemon law buyback is on record.
Failure modes owners describe
Transmission stuck in gear / limp mode
Vehicle becomes stuck in a single gear (often 6th) and loses power. Cannot accelerate normally. Requires engine restart to reset. Occurs intermittently or repeatedly during normal driving.
When: Intermittent; reported between 6,000 and 160,000+ miles; some failures as early as 40,000 miles
Symptoms owners cite: Vehicle stuck in one gear and will not shift; Loss of power when stuck in gear; Vehicle enters limp mode; Can only exit by shutting off engine and restarting; Happens at least 10 times over a 3-month period in some cases
Codes mentioned: Transmission valve body failure, Conductor plate failure
Repairs/costs cited: Valve body replacement cited in forums and diagnostics; transmission replacement ($7,800 reported); one transmission specialist diagnosed valve body replacement needed; another case required conductor plate and valve body replacement
Recalls/TSBs owners mention: Class action lawsuit dismissed; no recall issued; manufacturer refused warranty coverage when out of warranty period; one lemon law buyback on record
Rough transmission shifting on hills and after parking
Transmission shifts roughly between first and second gear, particularly after vehicle has been parked on an incline or decline. Also occurs while driving on inclines or after cruise control use.
When: Started 6–8 months into ownership at 57,000 miles
Symptoms owners cite: Rough jolting type shifting from first to second gear; Transmission stays in second gear until restart; Occurs on inclines, declines, and after cruise control; Check engine light comes on
Repairs/costs cited: Forums suggest valve body replacement; no repair completed in narrative
Recalls/TSBs owners mention: No recall; owner notes lack of manufacturer response despite numerous complaints
Accelerator unresponsive / no throttle response
Pressing the accelerator pedal produces no vehicle movement. Engine RPMs increase but car crawls forward at 1–5 mph or does not accelerate at all. Occurs suddenly during normal driving (traffic lights, turns, freeway). Engine restart restores function temporarily.
When: Multiple incidents over months; one case involved a 2007 S600 with repeated failures over several months
Symptoms owners cite: Accelerator pedal has no effect on vehicle movement; Engine revs but car does not accelerate; Vehicle crawls at less than 5 mph despite full throttle input; Oncoming traffic forced to brake to avoid collision; Temporary fix: park, turn off engine, restart
Repairs/costs cited: Dealer unable to diagnose cause; one dealer could not determine cause despite months of attempts; no repair successful
Recalls/TSBs owners mention: One S600 case resulted in lemon law buyback by manufacturer; manufacturer did not respond in writing to owner correspondence in that case
Transmission stall and whining noise
Vehicle stalls without warning while merging or driving at moderate speed. Engine makes whining noise that increases with acceleration. Transmission failure diagnosed.
When: At 100,000 miles on well-maintained vehicle with full service records
Symptoms owners cite: Vehicle stalls during highway merge in heavy traffic; Whining noise from transmission that increases with acceleration; Complete loss of driving function
Repairs/costs cited: Transmission replacement required at cost of $7,800; dealer noted this should not happen but stated he has seen this failure before
Recalls/TSBs owners mention: Warranty had expired; no manufacturer assistance provided
Complete transmission failure without warning
Transmission suddenly fails with no warning signs. Vehicle becomes non-functional. Occurs on vehicles with low mileage and full service history.
When: At 40,000 miles on 2007 S550 purchased new and maintained by Mercedes dealer
Symptoms owners cite: Transmission completely inoperable; No prior warning or symptoms
Repairs/costs cited: Full transmission replacement required at owner expense
Recalls/TSBs owners mention: Manufacturer initially denied warranty, claiming improper maintenance; eventually produced service records proving dealer maintenance; no recall or goodwill repair offered
Engine stall with transmission malfunction
Engine stalls suddenly without apparent reason. Transmission appears not to function properly. Vehicle returns to normal operation after 2–3 hours of parking. Problem recurs without dashboard warning.
When: Intermittent failures
Symptoms owners cite: Engine stall without warning; Transmission dysfunction during stall event; Self-resolves after extended parking; No dashboard malfunction indicator displayed
Rear engine oil leak with fire hazard
Oil leaks from rear of engine. Burning oil underneath vehicle creates smoke and small fires. Owner expresses concern about full engine fire.
When: Timing not specified
Symptoms owners cite: Oil leak from rear of engine; Oil burns underneath vehicle; Small fires and heavy smoke; Hazard of full engine fire
Synthesized from 14 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 3 most recent
Vehicle goes in limp mode all Mercedes s550 2007 model have the same problem
In repeated incidents, depressing the accelerator in my 2007 Mercedes benz s600 had no effect. I was, for example, left adrift in heavy freeway traffic, with semi-trailers whizzing by and no way to accelerate--pure inertia was carrying the car forward. Mercedes benz's largest northern california dealer, autobahn, was unable to fix the problem for months, even after advising me that they were…
Had powertrain trouble with your 2007 Mercedes-Benz S-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 powertrain problem on the 2007 Mercedes-Benz S-Class?
It's a meaningful issue. 14 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $2,500.
At what mileage does the powertrain typically fail?
Across the 14 complaints that reported odometer mileage, most powertrain failures cluster between 42,000 and 91,693 miles, with the median around 68,400. A quarter of owners report trouble before 42,000; a quarter make it past 91,693. 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 $2,500 for powertrain 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 powertrain?
No active recalls currently cover powertrain 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/2007/Mercedes-Benz/S-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.