Engines Market

Mercedes GLC 220d / 250d Specialists

Mercedes Benz GLC Class GLC 220d / GLC 250d Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Mercedes Benz GLC Class 220d and 250d engine specialists. Compare prices on reconditioned, rebuilt and used OM651 2.1-litre diesel engines - supply & fit available nationwide for both rear-wheel drive and 4MATIC variants.

Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
Mercedes Benz GLC Class GLC 220d / GLC 250d Engine
from£2,200 to £3,900
  • Usedfrom £1,200
  • Reconditionedfrom £1,800
  • Common codesOM651.924, OM651.921
Mercedes Benz glc-class GLC 220d / GLC 250d Used Engine — OM651.924Mercedes Benz glc-classUsed Engine — OM651.924Mercedes Benz glc-class GLC 220d / GLC 250d Reconditioned Engine — OM651.924Mercedes Benz glc-classReconditioned Engine — OM651.924Mercedes Benz glc-class GLC 220d / GLC 250d Rebuilt Engine — OM651.924Mercedes Benz glc-classRebuilt Engine — OM651.924

Get your free Mercedes Benz glc-class GLC 220d / GLC 250d engine quotes

Secure enquiry — no spam, no pressure. Genuine quotes only from vetted UK specialists.

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

How it works

3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

Mercedes Benz GLC Class GLC 220d / GLC 250d Engine History & Specs at a Glance

The Mercedes Benz GLC 220d and GLC 250d defined the diesel-powered GLC range throughout the first-generation X253 and C253 production run from 2015 to 2019, powered by the OM651 2.1-litre twin-turbo diesel engine - a unit that balanced strong torque with impressive economy but developed a reputation for timing chain and injector-related failures as mileages climbed.

Mercedes Benz GLC Class GLC 220d / GLC 250d
  1. 2015

    GLC 220d and GLC 250d launched with X253 SUV and C253 Coupe body styles, OM651 2.1L twin-turbo diesel, 9G-Tronic automatic transmission

  2. 2015

    GLC 220d: 170hp, 400Nm; GLC 250d: 204hp, 500Nm - both with twin-turbo configuration

  3. 2019

    Facelift introduced OM654 2.0L diesel replacing OM651 in 220d and 300d models

  4. 2019

    OM651 production ends after powering the majority of first-generation GLC diesel sales

Every OM651 diesel engine fitted to the Mercedes Benz GLC Class 220d and 250d is covered below, with UK rebuilt pricing and known failure points from real owner experience.

Engine Codes & Pricing

Mercedes Benz GLC Class 220d / 250d Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

OM651.924 — 2.1L Twin-Turbo Diesel (2015-2019) - GLC 220d engine

OM651.924 — 2.1L Twin-Turbo Diesel (2015-2019) - GLC 220d

Power Output
170 hp (125 kW) @ 3,000-4,200 rpm
Torque
400 Nm @ 1,400-2,800 rpm
Displacement
2,143cc
Configuration
Inline-4, DOHC, twin-turbo, common-rail direct injection
Years Fitted
2015-2019

Can’t find your exact engine code?-> Get quotes for OM651.924 Mercedes Benz GLC Class GLC 220d engine replacement

-> Get quotes for OM651.924 Mercedes Benz GLC Class GLC 220d engine replacement

Common Problems

Mercedes Benz GLC Class 220d / 250d Engine Problems Repair Cost vs Replacement

The Mercedes Benz GLC 220d and 250d rely on the OM651 2.1-litre twin-turbo diesel - a fundamentally robust engine that regularly exceeds 200,000-300,000 km when properly maintained, but has developed a well-documented reputation for predictable failures. Timing chain stretch, piezo injector wear, swirl flap actuator failure, and water pump leaks are the most frequently cited issues. Every rebuilt engine supplied through EnginesMarket includes upgraded components designed to address the original failure point - plus a minimum 12-month unlimited mileage warranty. Below we break down the most common GLC 220d and 250d engine failures, what they cost to fix, and when replacement is the smarter financial decision.

Common failure points and repair options

OM651 Timing Chain Stretch

Affected
Mercedes Benz GLC Class GLC 220d (OM651.924) and GLC 250d (OM651.921), 2015-2019
Typical failure mileage
75,000 - 120,000 miles
Root cause
The OM651's single-row timing chain drives both camshafts and the high-pressure fuel pump. A faulty chain tensioner causes premature chain elongation, producing a distinct rattle during cold starts. If ignored, chain skip can lead to cam/crank correlation codes, misfires, and catastrophic engine damage.

Repair options

Repair tierDealer priceSpecialist price
Minor - Tensioner & Guides Replacement£600-£1,000£350-£600
Intermediate - Full Timing Chain Kit£1,800-£2,800£1,200-£1,800
Full Replacement - Rebuilt Engine£5,500-£7,500£3,200-£5,000
Our recommendation
If you hear the characteristic 2-3 second rattle only on cold start with no fault codes, replace the tensioner immediately - it's £350-£600 well spent. Once chain skip triggers camshaft correlation codes (P0016/P0017), the full timing kit is mandatory. If the engine has jumped timing causing valve contact, only a full replacement engine makes financial sense. With proper maintenance, OM651 diesels can exceed 250,000-300,000 miles.
-> Compare rebuilt OM651 Mercedes Benz GLC Class 220d / 250d engine prices

OM651 Piezo Injector Failure

Affected
Mercedes Benz GLC Class GLC 220d (OM651.924) and GLC 250d (OM651.921), 2015-2019
Typical failure mileage
80,000 - 120,000 miles
Root cause
The OM651's piezo injectors are prone to premature wear-and-tear and a high failure rate, particularly when oil change intervals are neglected. Carbon deposits form around the injector nozzle tip and sealing washer, disrupting the spray pattern and allowing combustion gases to blow past - leading to hard starting when warm, rough idle, and misfires.

Repair options

Repair tierDealer priceSpecialist price
Minor - Injector Cleaning & Decarbonisation£400-£650£200-£350
Intermediate - Injector Replacement (1-4 Units)£900-£2,000£500-£1,200
Full Replacement - Rebuilt Engine£5,500-£7,500£3,200-£5,000
Our recommendation
If your GLC 220d or 250d takes three or four cranks to start when warm but runs fine once going, start with professional injector cleaning at a diesel specialist - £200-£350 often solves it. However, piezo injectors are expensive, so consider a full rebuilt engine if you're facing multiple injector failures on a high-mileage car.
-> Compare OM651 injector replacement and rebuilt engine prices for your GLC 220d / 250d

OM651 Swirl Flap Actuator & EGR Failure

Affected
Mercedes Benz GLC Class GLC 220d (OM651.924) and GLC 250d (OM651.921), 2015-2019
Typical failure mileage
70,000 - 100,000 miles
Root cause
The intake port shutoff (swirl flap) actuator can fail, affecting EGR operation and causing power loss and emissions faults. EGR clogging from short journeys is also common.

Repair options

Repair tierDealer priceSpecialist price
Minor - EGR Valve & Swirl Flap Cleaning£400-£700£200-£400
Major - Swirl Flap Actuator Replacement£800-£1,400£500-£900
Full Replacement - Rebuilt Engine£5,500-£7,500£3,200-£5,000
Our recommendation
The OM651's EGR and swirl flap systems benefit from regular carbon cleaning, particularly on urban-driven vehicles. If you notice rough idle or loss of power, have the EGR valve and intake system inspected. Specialist cleaning is significantly cheaper than dealer pricing and can restore lost performance.
-> Compare OM651 EGR and swirl flap repair costs for your GLC 220d / 250d

Don't Let Engine Failure Write Off Your Mercedes Benz GLC 220d or GLC 250d

A failed OM651 engine doesn't have to mean the end of your GLC diesel. Whether you're dealing with timing chain stretch, piezo injector failure, or swirl flap actuator issues, EnginesMarket makes it simple to compare prices from trusted UK Mercedes Benz GLC Class specialists. Every rebuilt engine in our network includes upgraded components designed to address the original failure point, a minimum 12-month unlimited mileage warranty, and nationwide delivery with supply & fit options available.

Compare Mercedes Benz GLC Class 220d / 250d Engine Replacement Prices Now ->

FAQ

Mercedes Benz GLC Class 220d / 250d Engine ReplacementFrequently Asked Questions

Everything Mercedes Benz GLC Class GLC 220d / GLC 250d owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

Compare Mercedes Benz GLC Class 220d / 250d Engine Prices Today

Comparing quotes for your Mercedes Benz GLC Class 220d or 250d engine replacement is completely free and carries no obligation - enter your registration above, receive tailored prices from UK specialists who know the OM651 twin-turbo diesel engine inside out, and get back on the road with confidence. Every rebuilt engine is backed by a minimum 12-month unlimited mileage warranty.

100+100+ GLC diesel engines supplied through our network
12-Month12-Month Warranty on every rebuilt GLC 220d and 250d engine
NationwideNationwide UK delivery
Get Free Mercedes GLC Class 220d / 250d Engine Quotes ->

Compare quotes from trusted UK Mercedes Benz GLC Class GLC 220d / GLC 250d engine specialists with warranty-backed rebuilt, reconditioned and used options nationwide.