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What 14 owners told NHTSA about the 2012 Mercedes-benz S-class Phev

These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.

All (14)Crash / fire / injury (2)Engine (7)Fuel system (5)Transmission & drivetrain (3)Electrical system (2)Speed control (2)Electronic Stability Control (esc) (1)Steering (1)

1 of 14 complaints match · Transmission & drivetrain · crash/fire/injury only · clear filters

Apr 11, 2012Transmission & drivetrainCrash

2012 MERCEDES S550. CONSUMER STATES VEHICLE SLID BACKWARDS IN PARKING LOT *TGW THE CONSUMER STATED THE SAFETY ISSUE WAS REGARDING THE VEHICLE BEING PUT IN THE NEUTRAL POSITION AFTER TURNING OFF THE ENGINE. THE CONSUMER STATED THREE WEEKS AGO, HE HAD THE MISFORTUNE OF PARKING HIS VEHICLE IN A PARKING LOT. WITHOUT OPENING THE DOOR, HE TURNED OFF THE ENGINE AND WHEN HE REMOVED HIS FOOT FROM THE BRAKE, THE VEHICLE SLID BACKWARDS AND HIT ANOTHER VEHICLE. BOTH VEHICLES WERE DAMAGED. THE CONSUMER STATED THE MINUTE THE ENGINE IS TURNED OFF, THE VEHICLE SHOULD BE PUT IN THE ELECTRONIC PARKING POSITION, RATHER THAN NEUTRAL.*JB

NHTSA ODI 10454119

Working with the data? Download all 14 complaints as CSV · fetched from NHTSA July 21, 2026

How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your pre-purchase inspection list. Back to the full 2012 Mercedes-benz S-class Phev verdict →