2010 S400 HYBRID WONT START FIRST INSTANCE WAS LESS THAN 24 HOUR OF PURCHASING CAR FROM LOCAL DEALER. LIGHTS ALL ON BUT NO CRANK. STARTED AFTER AND TWO WEEKS LATER IT HAD TO BE TOWED BECAUSE IT COMPLETELY WONT START. MBUSA FORUM CHAT AND SEVERAL SOCIAL MEDIA GROUPS ALL AROUND THE WORLD HAS THE SAME PROBLEM WITH THIS MODEL AND IT COMES DOWN TO AN ELECTRONICS POWER MODULE THAT COST MORE THAN WHAT TH…
2010 mercedes-benz S-Class electrical problems
moderate 10 complaints filed with NHTSA · avg repair $850
Complaints
10
Recalls
0
Crashes
0
Avg fix
$850
What owners are reporting 6 most recent
THE COMPUTER CONTROL UNIT FOR THE HYBRID MOTOR HAS FAILED ON MY AND MANY S400S. THIS CAUSES CAR TO STALL OUT AT STOPLIGHTS OR WHILE DRIVING. THIS IS A SAFETY ISSUE.
VEHICLE BEGAN TO CUT COMPLETELY OFF WHEN STOPPED AT A RED LIGHT OR STOP SIGN. IT BEGAN TO TAKE LONGER AND LONGER TO RESTART WHEN TURNED OFF AND ON. EVENTUALLY THE VEHICLE WOULD NOT START AT ALL. WHEN TAKEN TO THE DEALER, I WAS INFORMED THAT THE POWER CONTROL MODULE WAS BAD AND THE COST TO REPLACE WAS UPWARD OF $11,000. AFTER SPEAKING TO MANY MANAGERS AND MY CAR SITTING AT THE DEALERSHIP FOR N…
THE CAR FIRST STARTED TO STOP INTERMITTENTLY WITHOUT ANY WARNING AT ALL AT THE TRAFFIC INTERSECTION, THEN I WAS ABLE TO START IT AGAIN AFTER SHUTTING EVERY THING DOWN. THEN A MONTH LATER, THE SAME THING HAPPENED AGAIN BUT THIS TIME I WAS NOT ABLE TO START THE CAR AGAIN. THIS COULD BE A VERY DANGEROUS SAFETY SITUATION IF THE ENGINE SHUTS DOWN WHILE I WAS DRIVING ON THE FREEWAY. MERCEDES ONLY PROVID…
I WAS DRIVING, TRYING TO GET OFF THE HIGHWAY, I TOOK EXIT WHICH IS A 270 DEGREE CIRCLE WITH SHARP TURNS, I AM NOT DRIVING FAST AT ALL BUT THE CAR JUST STALLED WHILE DRIVING, STEERING WHEEL LOCKED AND I ALMOST FALL DOWN THE HILL, I ALMOST DIED, THIS PRODUCT HAS SERIOUS QUALITY ISSUES. I WAS DRIVING IN DOWN TOWN MANHATTAN WITH TWO OF MY MOST IMPORTANT CLIENTS, WE WERE GOING TO AN ART AUCTION, THE…
THE S400 HYBRID HAS A HABIT OF STALLING WHEN IN A STOP POSITION. THIS REQUIRES A COMPLETE RE-START AT A STOP LIGHT OR AFTER HAVING COME TO A COMPLETE STOP. IN ADDITION THE AIR CONDITIONING SHUTS OFF AND DOES NOT COME BACK ON UNTIL YOU STOP FOR A FEW MINUTES AND RE-START THE VEHICLE. THE CAR STALLING IS VERY UN-SAFE. THE CAR STALLS AT A STOP POSITION.
Common questions
How serious is the electrical problem on the 2010 mercedes-benz S-Class?
It's a documented issue but not catastrophic. 10 complaints have been filed. Repairs average $850 and most owners catch it before it causes a breakdown.
At what mileage does the electrical typically fail?
Mileage data is limited for this issue. Owners report failures across a wide range, suggesting cause is more about driving conditions and maintenance than mileage alone.
What does it cost to fix?
Independent shops typically charge around $850 for electrical 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 electrical?
No active recalls currently cover electrical 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.
Other problem areas on this vehicle
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. 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.
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