2012 Mercedes-Benz C350 Service and Repair Manual

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Factory-Grade Data

2012 Mercedes-Benz C350 service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.

Designed for technicians and DIY owners, this manual helps you troubleshoot accurately, follow step-by-step repair procedures, and reference wiring diagrams and system sections quickly while you work.

What’s included

  • Step-by-step repair procedures and service information
  • Specifications and reference data (where provided)
  • Wiring diagrams and electrical sections
  • Powertrain, brakes, steering, suspension, HVAC and more

Trims covered

  • Base Sedan 4-Door
  • Sport Sedan 4-Door
  • Base Coupe 2-Door
  • 4Matic Coupe 2-Door

Engines covered

  • 3.5L 3498CC V6 GAS DOHC Naturally Aspirated
  • 3.5L 3498CC V6 FLEX DOHC Naturally Aspirated

Index / Table of contents

  • Body
  • Brakes
  • Chassis Electrical
  • Driveline
  • Engine Cooling
  • Engine Electrical
  • Engine Mechanical
  • Engine Performance & Emission Controls
  • Fuel System
  • General Information & Identification
  • Heating, Ventilation, & Air Conditioning
  • Hybrid & Electric Vehicle Systems
  • Steering
  • Suspension
  • Transmission, Clutch, & Transfer Case
  • Wiring Diagrams

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Vehicle Safety Data

2012 Mercedes-Benz C350 Recalls & Complaints

NHTSA #20V29800022/05/2020Component: AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE

Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2012 C250, C250 Coupe, C300, C350, C350 Coupe, C63 AMG, and C63 AMG Coupe vehicles equipped with a front passenger air bag assembly replaced under

Consequence

An incorrect passenger air bag may not provide adequate protection, increasing the risk of injury in

Remedy

MBUSA will notify owners, and dealers will replace the passenger air bag module, free of charge. Th

NHTSA #21V63800013/08/2021Component: AIR BAGS:FRONTAL

Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2015-2016 E400 Coupe, 2012-2015 C250 Coupe, C350 Coupe, C63 AMG Coupe, 2011-2014 E350 Coupe, and 2012-2014 E350 Cabrio vehicles. An incorrect front

Consequence

An incorrect air bag may not function properly in a crash, increasing the risk of injury.

Remedy

Dealers will replace the front passenger air bag on the affected vehicles, free of charge. Owner n

NHTSA #17V01700010/01/2017Component: AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE

Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2012 C300 4Matic, C250, C250 Coupe, C350, C350 Coupe 4Matic, C350 Coupe, C63 AMG, C63 AMG Coupe, E350 Coupe 4Matic, E350 Cabrio, E350 Coupe, E550 Ca

Consequence

An inflator rupture may result in metal fragments striking the vehicle occupants resulting in seriou

Remedy

MBUSA will notify owners, and dealers will replace the front passenger air bag modules, free of char

TSB #11032875

Complaint There are several types of complaint about noises or poor windshield wiper wiping performance: A: Wiper blades squeaking, chattering, shuddering B: The windshield is not wiped completely (streaking) C: During the downward movement

TSB #11032684

Complaint Potential corrosion on the rear axle carrier Cause Due to market-specific conditions such as moisture, ingress of dirt and/or environmental influences, corrosion can occur on the rear axle carrier Remedy In the event of a complain

TSB #11032599

Complaint Creaking noise, in irregular sequence when driving slowly in combination with slight steering movements and/or Creaking/crackling noises from the area of the wheel bearing on the front axle when cornering/ maneuvering. Sound file

TSB #11031594

This NCU replaces the prior NCUs issued on May 18, June 25, 2020 and October 1, 2020 and contains important workshop instructions on how the HVAC Service Warranty repair must be carried out. To enhance the satisfaction of our customers, avo

TSB #11031580

Complaint Headlamp, front fog lamp leaky or fogged. Cause Fogging of the headlamps is a natural phenomenon, which can occur under certain climatic conditions. It does not lead to any technical impairment of the headlamp. If a pressure compe

TSB #11031367

Complaint Creaking noise, in irregular sequence when driving slowly in combination with slight steering movements and/or Creaking/crackling noises from the area of the wheel bearing on the front axle when cornering/ maneuvering. Sound file

TSB #11029959

Complaint Headlamp, front fog lamp leaky or fogged Cause Fogging of the headlamps is a natural phenomenon, which can occur under certain climatic conditions. It does not lead to any technical impairment of the headlamp. If a pressure compen

TSB #11029025

Complaint Headlamp, front fog lamp leaky or fogged Cause Fogging of the headlamps is a natural phenomenon, which can occur under certain climatic conditions. It does not lead to any technical impairment of the headlamp. If a pressure compen

Showing the 8 most recent of 78 technical service bulletins on file with NHTSA.

20241001Component: FUEL SYSTEM, GASOLINE

The contact owns a 2012 Mercedes-Benz C350. The contact stated while the vehicle was parked, the contact noticed a strong smell of fuel around the exterior of the vehicle. In addition, the contact sta

20230225Component: POWER TRAIN

My car’s left side rear subframe is cracked due to corrosion. I started hearing a weird noise a week ago, and my car suddenly veered to the left side when I pressed the brake. I almost crashed my ca

20230225Component: SUSPENSION

My car’s left side rear subframe is cracked due to corrosion. I started hearing a weird noise a week ago, and my car suddenly veered to the left side when I pressed the brake. I almost crashed my ca

20220701Component: VISIBILITY:SUN/MOON ROOF ASSEMBLY

The contact owns a 2012 Mercedes-Benz C350. The contact stated while driving at an undisclosed speed, the sunroof glass shattered and landed on the sunroof cover. There was no impact on the sunroof th

20210524Component: SUSPENSION

1. The (RH) rear suspension forward link attach point on the rear Suspension Cross-Member (Mercedes-Benz P/N: 204-350-01-41), separated from the sub frame due to internal corrosion of the Suspension

Showing the 5 most serious of 39 complaints filed with NHTSA.

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