2015 Mercedes-Benz C300 Service and Repair Manual

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Covers all 2015 C300 trims — Base Sedan 4-Door, 4Matic Sedan 4-Door ·
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2015 Mercedes-Benz C300 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
  • 4Matic Sedan 4-Door

Engines covered

  • 2.0L 1991CC l4 GAS DOHC Turbocharged

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
NHTSA #18V85000029/11/2018Component: STEERING:RACK AND PINION:RACK

Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2015-2016 Mercedes Benz C300, 2017-2019 C300 Cabrio, C300 Coupe, C63 Cabrio, 2015 C63S AMG, 2018-2019 C300, C350e, C63 AMG, C63S AMG Cabrio, 2018 C6

Consequence

A car that cannot be properly steered has an increased risk of a crash.

Remedy

MBUSA will notify owners, and dealers will replace the steering rack, free of charge. The recall be

NHTSA #17V11400023/02/2017Component: ELECTRICAL SYSTEM:STARTER ASSEMBLY

Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2015-2017 C300 4Matic, C300, CLA250, CLA250 4Matic and CLA45 AMG vehicles, 2017 C300 4Matic Cabrio, C300 4Matic Coupe, C300 Cabrio, C300 Coupe, E30

Consequence

If the starting current limiter overheats, the surrounding components can melt, increasing the risk

Remedy

MBUSA will notify owners, and dealers will install an additional fuse in the electrical line to the

NHTSA #21V19700019/03/2021Component: STRUCTURE:BODY:ROOF AND PILLARS

Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2020 C300 Coupe, C43 Coupe AMG, C43 AMG, 2015-2020 C300, GLA250, 2016-2018 C350e, CLA45 Coupe AMG, 2015 C400, S65 AMG, 2015-2019 C63 AMG, 2016

Consequence

The adhesive bonding of the front panel might deteriorate, possibly causing the front panel to detac

Remedy

Mercedes-Benz dealer will remove the bonded panel and will install a new front panel by following th

NHTSA #15V84500016/12/2015Component: STEERING:ELECTRIC POWER ASSIST SYSTEM

Mercedes-Benz USA, LLC (MBUSA) is recalling certain model year 2015 C300 and C400 4matic sedans manufactured January 27, 2014, to December 1, 2014. Due to an error in the electric power steering cont

Consequence

If the vehicle experiences a loss of power steering assist, extra steering effort will be required,

Remedy

MBUSA will notify owners, and dealers will update the power steering software, free of charge. The

NHTSA #23V85400015/12/2023Component: STRUCTURE:BODY:ROOF AND PILLARS

Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2014-2020 C-Class, CLA, GLA, S-Class, GLC, and GLE vehicles. Please refer to MBUSA's recall report for specific vehicle details. The front roof pa

Consequence

A detached roof panel can become a road hazard, increasing the risk of a crash.

Remedy

Dealers will replace the front panel, free of charge. Owner notification letters were mailed on Aug

NHTSA #17V17700014/03/2017Component: ELECTRICAL SYSTEM:SOFTWARE

Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2016 AMG GT-S, GLC300, CLA250 and GLE300d 4Matic vehicles, 2013 C250, E350 BlueTec and G63 AMG vehicles, 2008-2014 C300 vehicles, 2013-2014 C300 4Ma

Consequence

If the air bags do not deploy as intended in the event of a crash, there would be an increased risk

Remedy

MBUSA will notify owners, and dealers will update software in the affected control units, free of ch

NHTSA #19V78700001/11/2019Component: COMMUNICATION

Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2013-2017 vehicles due to a software fault that may cause the date and time for the emergency call system (eCall) to differ from the actual date an

Consequence

An inaccurate vehicle location may delay emergency responders, increasing the risk of injury.

Remedy

MBUSA has initiated an Over the Air (OTA) remote update. MBUSA will also notify owners, and dealers

TSB #11033185

Complaint After successful commissioning of the HERMES control unit (N112/9) with XENTRY Diagnosis DVD 03/2026, the message "SOS - service not activated" appears on the instrument cluster. In addition, the following two conditions are also

TSB #11033016

Complaint The customer requests deactivation of the N112/9 HERMES communication module Note: Deactivation of the HERMES control unit (N112/9) is not supported for gray-market vehicles. Cause Before deactivating the HERMES control unit (N112

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 #11032699

Complaint 1. General Diagnostic Tips 2. One or More PARK Sensor Activations 3. Red Ring Around Vehicle 4. "Active Parking and Parking Assist Inoperative" on Instrument Cluster 5. Cameras 6. Other Park Topics Cause Various root causes Remedy

TSB #11031806

In our continuing efforts to assure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA (MBUSA) is extending the coverage for the intake line assembly on your vehicle from the

TSB #11031729

The purpose of this letter is to advise you of additional benefits that Mercedes-Benz is providing to you regarding your vehicle ownership. Whats Included In our continuing efforts to assure the proper performance of Mercedes-Benz products

TSB #11031616

Daimler AG (DAG), the manufacturer of Mercedes-Benz vehicles, has determined that on the various Model Year (MY) 2014 - 2018 Mercedes-Benz vehicles listed below, the engine control unit (ECU) software may not meet current specifications. In

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

Showing the 8 most recent of 107 technical service bulletins on file with NHTSA.

20171104Component: AIR BAGSCrash reported4 injured

I WAS MAKING A LEFT AT A STOP SIGN WHEN A DODGE DURANGO HIT ME HEAD ON AND FELL

20260507Component: STEERINGCrash reported1 injured

I was driving my car was sputtering or trying to shut off while I press the gas and I let go of the gas and it catches and stayed on. I took it to the dealership and they said they found nothing wrong

20260507Component: ELECTRICAL SYSTEMCrash reported1 injured

I was driving my car was sputtering or trying to shut off while I press the gas and I let go of the gas and it catches and stayed on. I took it to the dealership and they said they found nothing wrong

20260507Component: FUEL/PROPULSION SYSTEMCrash reported1 injured

I was driving my car was sputtering or trying to shut off while I press the gas and I let go of the gas and it catches and stayed on. I took it to the dealership and they said they found nothing wrong

20190726Component: AIR BAGSCrash reported1 injured

TL* THE CONTACT OWNS A 2015 MERCEDES-BENZ C-300. THE CONTACT STATED THAT WHILE DRIVING APPROXIMATELY 30 MPH. A POLICE OFFICER HAD PULLED OVER ANOTHER VEHICLE AHEAD ON THE RIGHT SIDE OF THE ROAD. THE V

Showing the 5 most serious of 509 complaints filed with NHTSA.

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