2017 Mercedes-Benz C450 technical service bulletins
135 technical service bulletins and manufacturer communications cover the 2017 Mercedes-Benz C450, including one warranty extension.
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- Visibility/wiper
- Customer complaints relating to automatic transmission 725.0 (NAG3 Classic /9G‑TRONIC automatic...
- Repeat workshop visit for vehicle vibration while braking from 60MPH. NOTE: Although the symptom is...
- Only vehicles with a variable transfer case are affected
- Clanking noise from the area of the speakers in the doors
- Customer complaints relating to automatic transmission 725.0 (NAG3 Classic / 9G‑TRONIC automatic...
- During part of the steering movement, it feels heavier or more difficult to steer in the same spot every time
- Tailgate opens unintentionally
- A popup is seen on the HU with the message "data connection temporarily not available". Potentially...
- This document is intended as a pre-case diagnostic reference for transmission related concerns
- Mercedes-Benz USA is currently experiencing limited availability of transmission fluid specification ATF...
- Crackling and cracking noise from the outer wheel on the front axle when cornering
- Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end)
- Dear Mercedes-Benz USA Dealers, The part numbers listed in the chart below should no longer be installed,...
- Service code B1 displayed in the customer menu does not match the workshop code displayed in the workshop...
- The customer requests deactivation of the N112/9 HERMES communication module Note: Deactivation of the...
- After successful commissioning of the HERMES control unit (N112/9) with XENTRY Diagnosis DVD 03/2026, the...
- Dear Mercedes-Benz USA Dealers, The part numbers listed in the chart below should no longer be installed,...
- There are several types of complaint about noises or poor windshield wiper wiping performance: A: Wiper...
- The part numbers listed in the chart below should no longer be installed, and any existing stock must be...
- Noises at the front axle when cornering or maneuvering (video files attached) Note: Save video files...
- 1. General Diagnostic Tips 2. One or More PARK Sensor Activations 3. Red Ring Around Vehicle 4. "Active...
- Headlamp, front fog lamp leaky or fogged
- Headlamp, front fog lamp leaky or fogged
- Unknown or other
- Check engine light on with the following fault is current in the VGS Control Unit: P084300 Oil pressure...
- Customer states the AC either does not cool/has poor performance or heat is insufficient
- Customer states the AC either does not cool/has poor performance or heat is insufficient
- (Original LI document #: LI27.35-P-079039) Clicking noises from the electro-hydraulic control unit (EHS)...
- The flap of the reversing camera opens and closes by itself during forward travel several times during the...
- The shift from 1st to 2nd gear may be uncomfortable under light load
- Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end)
- Possible complaints about shift quality, issues with learning the park lock, and slipping/rinse entries in...
- Transmission control unit Y3/8n4 (fully integrated transmission control unit (VGS)) not listed in quick...
- After a software update of HERMES communication module N112/9 has been performed on a gray import vehicle,...
- The result from the XENTRY battery test does not match the current state of the battery
- Headlamp, front fog lamp leaky or fogged
- Headlamps leaking or fogged
- A popup is seen on the HU with the message "data connection temporarily not available". Potentially...
- A clicking/ticking/taping noise from underneath the vehicle with engine off during ECO stop event or after...
- The message "Device detected at diagnostics connection See Owner’s Manual" appears sporadically in the...
- During a phone call, the called party has difficulty understanding/cannot understand the driver, or...
- Customer-perceived problem: • Fuel gauge reading implausible • MIL ON (market-dependent) N118/3 Fault...
- Noise from area of instrument panel Noise might occur in the following conditions
- Paint damage on door paneling in area of door handle (see picture 1).
- Fuel door may require several attempts to open
- Wind or airflow noises in the area of the doors
- Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end)
- The flap of the reversing camera opens and closes by itself during forward travel several times during the...
- Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end)
- After a control unit replacement of "N112/9
- Transmission control unit Y3/8n4 (fully integrated transmission control unit (VGS)) not listed in quick...
- Rear lamps fogged up/not leaktight
- Only vehicles with a variable transfer case are affected
- Washer fluid system leaks
- Tension-releasing impact of the propeller shaft with the force-free in D "KID" function, after vehicle has...
- Headlamp or front fog lamp leaky or fogged
- Headlamps fogged or droplets forming
- To insure vehicle down time is kept at a minimum and all required information is available when case is...
- Headlamps fogged or droplets forming
- Electrical system
- In our continuing efforts to ensure the proper performance and quality of your vehicle, we are writing to...
- Electrical system
- Crease formation on genuine leather seat covers in vehicles with low mileage ⢠Objects left on the seats...
- The "SOS nonfunctional" message appears sporadically in the instrument cluster of the vehicle
- In our continuing efforts to assure the proper performance of Mercedes-Benz products and to enhance the...
- Visibility
- Loads induced at the steering wheel through pushing and pulling actions may
- Staining on door trim strips and top and bottom trim elements on rear side windows
- Height adjustment of electric steering column adjustment jammed in the top/bottom adjustment position...
- Customer may have one or more of the following complaints: • Vehicle location is shown incorrectly in the...
- Engine and engine cooling
- The touchpad dimming function does not work and the search lighting is either at maximum brightness or...
- The garage door hand transmitter cannot be initialized with the integrated garage door opener in the...
- The range of the integrated garage door opener (GTO) is too short
- MY15+ M278 and M157 Equipped Vehicles with Fault Code ""P023400 – Boost Pressure is Too High"" "
- The Weather App will not populate local weather data based on current vehicle position.
- Fuel filler flap opens slowly/switch flashes/tank is bleeding instrument cluster warning
- Intermittently after bus sleep the lower control panel LCP and upper control panel UCP may be panel UCP...
- Touch pad: Search lighting does not dim or does not turn on.
- Remote start causing CEL and U012600.
- For plug in hybrid and electric variants: Complaints about the electric range
- Model indicator index.
- Replace 3rd brake lamp, remove soft top compartment cover to access.
- Electrical system: software
- NTG5.5
- If the customer brakes sharply from a speed of > 30mph, without ABS intervention, there is a single...
- Cracking/Creaking Noises Coming From The Area Of The Mechanical Steering Column
- Headlamps fogged
- To enhance the satisfaction of our customers, avoid further costs of litigation and return focus to its...
- NTG5.5
- Information Label on Tire Sealant
- Throttle lift-off clunking noises at drive shafts of front axle
- Check coolant hose from expansion reservoir to cooler and replace if necessary
- High-voltage battery warning message" in instrument cluster
- Electric range is reduced after brief period
- NTG 5.5 head unit
- Comand
- BR205 Facelift
- Seat belt extender toothed rack sluggish or makes noises
- Model series 205 NAG2 only for C450 AMG, hard torque converter lockup clutch cut-in
- Disturbed Antenna Signal.
- Navigation system permanently displays "Activating".
- Ticking or pulsing noise from high-pressure pump and/or fuel injectors.
- Reset the customer-specific data and perform a software update of the AUDIO20 control unit.
- Intial startup not possible after replacement of transmisson 725.0 or of electrohydraulic controller unit.
- Headlamp fog.
- Traffic information service and posibly the voice control, nonfunctional after navigation software update.
- Cd/dvd
- High voltage battery warning message in instrument cluster.
- Gasket may settle causing a slight oil leak.
- Esp, bas, pre-safe
- Clunking noise from front axle suspension strut or rear axle shock absorber on short strokes of the damper
- Passenger side outside mirror glass adjusts itself at random at ignition on/off
- MY-All Model 205, Maintenance Interval
- In addition to the information published in the Introduction into Service Manual, note maintenance...
- Window lifter and outside mirror on passenger side malfunction after replacement of door control unit.
- The COMAND unit does not start or the COMAND display remains dark
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