Vehicle stalls intermittently in traffic, intersections. Vehicle starts intermittently, run, operates however, stalls when transitioning from stopped position to acceleration. A known defect pursuant to mercedes benz service campaign 2012080004. Presented vehicle to mercedes benz for repair. They confirmed that the vehicle was experiencing the problems described in the campaign and required the replacement power electronics module however, they refused to cover the repair of the vehicle and presented me an $11k estimate for repair. Mercedes benz manufacturer refusing to honor known defect recall. Extreme bad faith.
The worst 2012 Mercedes-Benz S400 problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Driver assistance1
- Electrical1
- Engine1
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Driver assistance1
- Electrical1
- Engine1
Recalls 2
Fuel system, gasoline
- What is wrong
- Mercedes-Benz is recalling certain model year 2011-2012 S400, S550, S550 4Matic, S63 AMG, C300, C300 4Matic, E350, GLK350, GLK350 4Matic, CL550 4Matic, and CL63 AMG vehicles manufactured from April 18, 2011, through July 12, 2011. Due to an irregularity stemming from the molding process of the fuel filter flange, the fuel filter flange may crack when operated in high temperatures.
- Risk
- If the fuel filter flange cracks, it will leak fuel which may lead to a fire if an external ignition source is present.
- Remedy
- Mercedes-Benz will notify owners, and dealers will replace the fuel filter, free of charge. The recall campaign is expected to begin in February 2013. Owners may contact Mercedes-Benz at 1‑800‑367‑6372.
Recall number 12V557000 · Recall details
Tires: pressure monitoring and regulating systems
- What is wrong
- Mercedes-Benz USA, LLC (Mercedes Benz) is recalling certain model year 2011-2012 S550, S550 CGI, S63, S600 Bi-Turbo, S65 AMG, S550 4-Matic, and S550 CGI 4-Matic and S400 Hybrid vehicles manufactured from March 3, 2011, through July 30, 2011, for failing to comply with the requirements of Federal Motor Vehicles Safety Standard (FMVSS) number 138, "Tire Pressure Monitoring System (TPMS)." The tire pressure monitoring system indicators may only illuminate for a portion of the time required by the standard and under certain conditions may not re-illuminate immediately after the vehicle is restarted as required.
- Risk
- If all four wheel sensors in the subject vehicles are simultaneously malfunctioning or missing, the TPMS will provide an initial warning, but this warning will not automatically repeat on subsequent ignition cycles, failing to remind the driver that the system is offline. Driving unknowingly with incorrectly inflated tires may result in sudden tire failure, increasing the risk of a crash.
- Remedy
- Mercedes Benz will notify owners, and dealers will reprogram the tire pressure monitoring unit, free of charge. The recall began on September 12, 2014. Owners may contact Mercedes Benz at 1‑800‑367‑6372.
Recall number 11V493000 · Recall details
Technical service bulletins for the 2012 Mercedes-Benz S400 75
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- Repeat workshop visit for vehicle vibration while braking from 60MPH. NOTE: Although the symptom is...
- Clanking noise from the area of the speakers in the doors
- Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end)
- After successful commissioning of the HERMES control unit (N112/9) with XENTRY Diagnosis DVD 03/2026, the...
- There are several types of complaint about noises or poor windshield wiper wiping performance: A: Wiper...
- Headlamp, front fog lamp leaky or fogged
- Headlamp, front fog lamp leaky or fogged
- Headlamps leaking or fogged
- Transmission control unit Y3/8n4 (fully integrated transmission control unit (VGS)) not listed in quick...
- Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end)
What 2012 Mercedes-Benz S400 owners say
Most recent owner complaints, unedited.
Compare the 2012 Mercedes-Benz S400
Other model years
Questions about the 2012 Mercedes-Benz S400
Is the 2012 Mercedes-Benz S400 reliable?
Owners have filed 1 complaint about the 2012 Mercedes-Benz S400, fewer than a typical S400 model year.
What is the most common problem with the 2012 Mercedes-Benz S400?
Driver assistance and stability, with 1 complaint. Next is electrical (1).
How many recalls does the 2012 Mercedes-Benz S400 have?
2 recalls, covering fuel system, gasoline and tires.
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