GLC Class Diesel Engines
from £1,800 to £5,500
Rebuilt units from £2,450 · Common codes: OM654, OM651, OM656
Mercedes Benz ENGINE MARKETPLACE
Mercedes GLC M274/M264/OM654 Engine Solutions - UK Specialists
Get quotes from trusted UK Mercedes GLC engine specialists. Compare reconditioned & used engines for GLC 200 to GLC 63 AMG - M274/M264/OM654 covered. Get a quote before it's too late.
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12-Month Warranty
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GLC Class Petrol Engines
from £1,600 to £4,800
Rebuilt units from £1,950 · Common codes: M274, M264, M260
GLC Class AMG Engines
from £4,500 to £12,000
Rebuilt units from £5,200 · Common codes: M276, M177, M139
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Supply & fit available - parts and labour from vetted specialistsInstant engine replacement quote - 100% free, no obligationEngine replacement near me - UK-wide specialist networkCompare reconditioned, rebuilt & used engine pricesSupply & fit available - parts and labour from vetted specialistsHow It Works
3 Simple Steps3 Simple Stepsto Finding the Best Mercedes Benz GLC Class Replacement Engineto Finding the Best Mercedes Benz GLC Class Replacement Engine
12-Month Warranty
Supply & Fit Available
Nationwide Delivery
Trusted UK Suppliers
Most replacements completed within 3-5 days.
Live UK Engine Market Data
What Are UK Drivers Paying for Mercedes Benz GLC Class Engine Replacement
UK rebuilt engine costs for Mercedes GLC Class variants below show documented failure causes, engine codes and specifications based on current market data.
Average Market Prices
↻ Last updated: 4 Aug 26, 9:26
Customer Reviews
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Rated 4.8 out of 5 by 1,081 verified customers who sourced reconditioned and used Mercedes Benz GLC Class engines through EngineMarket.
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Variants We Cover
Mercedes Benz GLC Class Engine ReplacementAll Variants Covered
Mercedes Benz GLC 220d
OM651 2.1L Diesel
Rebuilt Engines: £2,200-£3,800
Mercedes Benz GLC 220d
OM654 2.0L Diesel
Rebuilt Engines: £2,400-£4,200
Mercedes Benz GLC 200
M274 2.0L Petrol
Rebuilt Engines: £2,000-£3,500
Mercedes Benz GLC 200
M264 2.0L Petrol
Rebuilt Engines: £2,200-£3,800
Mercedes Benz GLC 350e
M274 2.0L Hybrid
Rebuilt Engines: £3,500-£6,000
Mercedes Benz GLC 43 AMG
M276 3.0L Petrol
Rebuilt Engines: £4,500-£7,500
Mercedes Benz GLC 43 AMG
M276 3.0L Petrol
Rebuilt Engines: £5,000-£8,000
Mercedes Benz GLC 63 AMG
M177 4.0L Petrol
Rebuilt Engines: £7,000-£12,000
Mercedes Benz GLC 63 S AMG
M177 4.0L Petrol
Rebuilt Engines: £8,500-£14,000
GLC Class
Engine Codes
Mercedes Benz GLC Class Engine CodesFull Technical Specifications & Replacement Guide
Every engine code fitted to the Mercedes Benz GLC Class across all generations (X253, C253, X254), with technical specs, compatible variants and trims, known failure points, and average rebuilt prices from UK specialists. Select any engine code to compare quotes.
Diesel Engines
Extracted from detailed diesel engine families across Mercedes Benz GLC Class variants.
OM651 - 2.1L Diesel
Main replacement triggers are timing chain wear, EGR / cooling faults and turbo-control issues.
Compatible variants
GLC 220dGLC 220d 4MATICGLC 250dGLC 250d 4MATIC
Avg. rebuilt price
£2,200 - £3,900
Supply only
Technical specifications
- Fuel type
- Diesel
- Engine size
- 2.1L
- Power output
- 170-204 hp
- Years fitted
- 2015-2019
Common failures
- ●Main replacement triggers are timing chain wear, EGR / cooling faults and turbo-control issues.
- ●Confirm exact engine code and fitment before ordering.
- ●Ask for warranty and supply & fit terms.
Not sure which engine code?
GLC Class
Common Problems
Mercedes Benz GLC Class Engine Problems - What It Costs to Fix & When Replacement Makes Sense
The Mercedes GLC Class (X253, C253, X254) is a refined premium SUV, but its OM654 diesel and M274/M264 petrol engines have well-documented weak points that drive replacement demand. Timing chain stretch on earlier four-cylinders, EGR cooler cracking on the OM654, and camshaft adjuster failure on the V6 M276 are the most searched failure patterns. Every...
Mercedes GLC OM654 EGR Cooler Cracking - The Most Searched Diesel Failure
Mercedes GLC OM654 EGR Cooler Cracking
Most affected vehicles
GLC 220dGLC 300d (2019-present
GLC 220d, GLC 300d (2019-present, OM654 engine)
Failure mileage range
40,000 - 80,000 miles
Typical failure window
Root cause
The original EGR cooler (part A6540940101) suffers thermal stress fractures, allowing coolant to enter the exhaust system, triggering low coolant warnings, misfires, and eventually engine overheating.
Repair options & estimated costs (UK ranges)
| Repair tier | Dealer price | Specialist price | What it involves | Longevity / suitability |
|---|---|---|---|---|
| EGR Cooler Replacement - Cooler-only swap | £1,100 - £1,600 | £700 - £1,100 | Replace failed EGR cooler with revised OEM unit, drain and refill coolant, clear fault codes | 3-5 years (revised cooler more durable but same design) |
| Full Replacement - Rebuilt engine with upgraded cooler | £6,500 - £9,000 | £4,200 - £5,800 | Supply & fit of bench-tested OM654 rebuilt engine with reinforced EGR cooler upgrade (brazed A6540940001), new gaskets, timing components | 100k+ miles with warranty backing |
Our recommendation
If caught early with no overheating damage, replace just the EGR cooler. However, many cases present after coolant loss has caused cylinder head damage. On a GLC worth £18,000-£25,000, the full engine replacement with upgraded cooler is the safer long-term investment. Specialist pricing beats dealer by 30-40%.
Compare rebuilt OM654 prices for your Mercedes GLC 220d or 300dReplacement Engine Options
Mercedes Benz GLC Class Engine TypesOptions, Costs & What to Expect
Every engine type for the Mercedes GLC Class (X253, C253, X254) is available through our UK network, with typical price ranges varying by variant, engine code and your budget.
Mercedes Benz GLC Class Reconditioned Engines (Recon)£2,200 - £5,500((supply only))
Mercedes Benz GLC Class Rebuilt Engines£1,950 - £4,800((supply only))
Mercedes Benz GLC Class Used Engines£1,200 - £3,500((supply only))
Mercedes Benz GLC Class Remanufactured Engines£3,000 - £7,500((supply only))
Mercedes Benz GLC Class Refurbished Engines£1,500 - £3,200((supply only))
Compare Mercedes Benz GLC Class engine prices with vetted UK suppliers
All engine types include a minimum 12-month unlimited mileage warranty when sourced through EngineMarket. Prices are typical UK market ranges based on historical quote data from our network and depend on exact engine code, variant, mileage and supplier. Use our free comparison tool above - enter your registration to get tailored quotes for your specific Mercedes Benz GLC Class within hours.
Engine Sizes
Mercedes Benz GLC Class Engines by SizeFind the Right Displacement for Your Variant
Every displacement fitted to the GLC Class across X253, C253 and X254 generations is listed below, with compatible engine codes, years and common failure notes for each.
The 2.0-litre diesel range forms the backbone of GLC diesel sales in the UK, spanning both the older OM651 (2015-2019) and the newer OM654 (2019-present) engines. The OM651 delivered strong torque and respectable economy, while the OM654 introduced stepped bowl combustion and lower friction for Euro 6d compliance. The OM654's EGR cooler cracking has become the most searched diesel failure pattern for this model.
⚙
Engine Code(s)
OM651 (2015-2019), OM654 (2019-present)
▣
Compatible Models (UK)
GLC 220d (2015-present), GLC 250d (2015-2019), GLC 300d (2019-present), GLC 200d
ϟ
Power output
Verified by registration
△
Common Failure Points
OM654 EGR cooler cracking, AdBlue injector clogging; OM651 swirl flap actuator failure, timing chain stretch
Production Years: 2019-2022
Get quotes for Mercedes Benz GLC Class 2.0L diesel enginesMercedes Benz GLC Class Engines Fuel Type
Mercedes Benz GLC Class Engines by Fuel Type
Choose your Mercedes Benz GLC Class engine by fuel type to compare realistic replacement prices, known issues, and compatible UK supply options - from the efficient GLC 220d to the ferocious GLC 63 AMG.
Mercedes Benz GLC Class Diesel Engines
DieselDiesel powered the majority of GLC sales across the X253 (2015-2022) and X254 (2022-present) generations, with the OM651 and OM654 four-cylinders dominating replacement enquiries - particularly the OM654's EGR cooler failures.
Common Mercedes Benz GLC Class Diesel Engine Families
- •OM651 - 2.1L four-cylinder (2015-2019 GLC 220d, 250d), known for swirl flap and injector issues
- •OM654 - 2.0L four-cylinder (2019-present GLC 220d, 300d), EGR cooler cracking is the most searched failure
- •OM642 - 3.0L V6 (2015-2019 GLC 350d), oil cooler seal leaks in the engine 'V' drive replacement decisions
Found In
- •X253 GLC Class SUV / C253 Coupe (2015-2022) - OM651, OM654, OM642
- •X254 GLC Class SUV / C254 Coupe (2022-present) - OM654 only
Known For
- •Strong motorway economy - 50+ mpg on OM654-equipped 220d models
- •OM654 EGR cooler cracking between 40k-80k miles - the dominant replacement driver
- •OM651 timing chain stretch and swirl flap actuator failure on higher-mileage units
Typical Diesel Models
- •GLC 220d
- •GLC 250d
- •GLC 300d
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Mercedes Benz GLC Class Diesel Engines
DieselDiesel powered the majority of GLC sales across the X253 (2015-2022) and X254 (2022-present) generations, with the OM651 and OM654 four-cylinders dominating replacement enquiries - particularly the OM654's EGR cooler failures.
Common Mercedes Benz GLC Class Diesel Engine Families
- •OM651 - 2.1L four-cylinder (2015-2019 GLC 220d, 250d), known for swirl flap and injector issues
- •OM654 - 2.0L four-cylinder (2019-present GLC 220d, 300d), EGR cooler cracking is the most searched failure
- •OM642 - 3.0L V6 (2015-2019 GLC 350d), oil cooler seal leaks in the engine 'V' drive replacement decisions
Found In
- •X253 GLC Class SUV / C253 Coupe (2015-2022) - OM651, OM654, OM642
- •X254 GLC Class SUV / C254 Coupe (2022-present) - OM654 only
Known For
- •Strong motorway economy - 50+ mpg on OM654-equipped 220d models
- •OM654 EGR cooler cracking between 40k-80k miles - the dominant replacement driver
- •OM651 timing chain stretch and swirl flap actuator failure on higher-mileage units
Typical Diesel Models
- •GLC 220d
- •GLC 250d
- •GLC 300d
Mercedes Benz GLC Class Petrol Engines
PetrolPetrol GLC models range from the economical 2.0-litre four-cylinder M274 and M264 units to the M276 V6 in the GLC 43 and the hand-built M177 V8 in the flagship GLC 63 - each with distinct replacement cost tiers.
Common Mercedes Benz GLC Class Petrol Engine Families
- •M274 - 2.0L four-cylinder (2015-2019 GLC 200, 250, 300), timing chain tensioner wear is the #1 failure
- •M264 - 2.0L mild hybrid (2019-present GLC 200, 300), 48V belt-driven starter-generator (BSG) adds complexity
- •M276 - 3.0L V6 biturbo (2016-2021 GLC 43 AMG), camshaft adjuster failure on cold starts
Found In
- •X253 GLC Class SUV / C253 Coupe (2015-2022) - M274, M276, M177
- •X254 GLC Class SUV / C254 Coupe (2022-present) - M264, M254
Known For
- •M274 timing chain rattle on cold start - catch it early or risk engine replacement
- •M264 EQ Boost mild hybrid system - specialist knowledge required for 48V component work
- •M276 camshaft adjuster wear - a £2k-£4k repair on a £25k-£35k vehicle
Typical Petrol Models
- •GLC 200
- •GLC 250
- •GLC 300
Mercedes Benz GLC Class Plug-in Hybrid (PHEV) Engines
PHEVThe GLC 350e (2016-2022) and second-generation GLC 300e/400e (2023-present) combine petrol engines with electric motors and batteries - complex systems requiring specialist PHEV knowledge for engine replacement.
Mercedes Benz GLC Class PHEV Engine Codes
- •M274 Hybrid - 2.0L petrol plus electric motor (GLC 350e, 2016-2022)
- •M254 PHEV - 2.0L petrol plus upgraded hybrid system (GLC 300e, 400e, 2023-present)
- •Electric motor paired with M274 or M254 petrol engine for combined 313-320hp
Found In
- •X253 GLC 350e, 350e 4MATIC (2016-2022)
- •X254 GLC 300e, 300e 4MATIC, 400e 4MATIC (2023-present)
Important Notes
- •Hybrid battery health inspection is essential before any engine replacement
- •Specialist PHEV-certified mechanics required - not all general engine shops qualify
- •Replacement availability is more limited than standard diesel or petrol units
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Not sure which fuel type your Mercedes Benz GLC Class has- Enter your registration number above to instantly identify your engine code, fuel system and compatible replacement options - all backed by a minimum 12-month unlimited mileage warranty from UK Mercedes Benz GLC Class specialists.
Engine YearsGet quotes for 2015-2019 Mercedes GLC Class replacement engines →
Mercedes Benz GLC Class Engines by YearWhat Was Fitted & WhenMercedes Benz GLC Class Engines by Year - What Was Fitted & When
This technical timeline covers all major engine changes across the GLC Class production run (2015 to present), helping owners identify their exact powerplant and compare rebuilt engine prices from UK specialists.
⚙Key Changes
- ✓New X253 (SUV) and C253 (Coupe) body styles launched
- ✓9G-Tronic automatic transmission introduced across all variants
- ✓4MATIC all-wheel drive optional or standard depending on variant
- ✓Early build M274 engines subject to timing chain tensioner recall
▣Main Engines
OM651- 2.1L diesel (GLC 220d, 250d)
M274- 2.0L petrol (GLC 200, 250, 300)
OM642- 3.0L V6 diesel (GLC 350d)
▰Popular Models
- •GLC 220d
- •GLC 250d
- •GLC 250
- •GLC 350d
🔧Known For
- ✓Strong residual values and premium SUV refinement
- ✓M274 timing chain tensioner wear - cold start rattle from 60k miles
- ✓OM651 swirl flap actuator failures and injector carbon build-up
- ✓OM642 oil cooler seal leaks in the V6 engine 'V' - labour-intensive repair
Engine Codes Covered:
OM651M274OM642Not sure which year your Mercedes Benz GLC Class was built- Enter your registration number and we'll identify the exact engine, model year, and compatible replacement options instantly - all backed by a minimum 12-month warranty from UK Mercedes Benz GLC Class specialists.
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