Thinking about buying a used Mercedes-Benz GLK (2015–2023) in New Zealand? We've documented 10 known faults for this model spanning engine, suspension, brakes, and fluid leaks. Each researched and verified before it's published. The most serious issues here are rated critical. Two are set out in full below — the rest, with the symptoms, repair costs and checks for each, are free with an account.
10
Documented faults
Critical
Most serious
$1,300–$3,200
Typical repair
5
Systems covered
Known Mercedes-Benz GLK faults
Every fault below is documented specifically for this model — researched and verified before it’s published.
01OM651 2.1CDi Timing Chain and Guide Failure
CriticalCommonEngine $3,500–$8,500 to fix
GLC 220d and 250d models produced from 2015 to the 2018 model-year facelift carried the OM651 2.1-litre diesel engine, which shares the same rear-mounted timing chain design weakness found across the wider OM651 family. Nylon-composite chain guides degrade under heat and oil contamination, and the hydraulic tensioner cannot maintain adequate chain tension during cold starts when oil pressure has not yet fully built. Chain jump across camshaft sprocket teeth creates immediate risk of valve-to-piston contact and catastrophic internal damage. The OM651 was replaced by the OM654 2.0-litre diesel during the 2018 GLC facelift.
Symptoms to notice
Cold-start metallic rattle from the rear of the engine settling after two to three minutes
Engine warning light with timing or camshaft fault codes P0016 or P0017
Hunting or unsteady idle during the first minutes of running from cold
Increased oil consumption as degraded guide material contaminates the sump
What to check
Cold-start the engine and listen at the firewall for a sustained rear-engine rattle before warming. Check for stored or pending codes referencing camshaft correlation using STAR diagnostics. Request full service history and confirm oil change intervals. On any example above 100,000 km without documented timing chain work, treat replacement as a near-term budget item before purchasing.
Where to look: Rear of engine block
Ask the seller
“Has the timing chain, tensioner, or guides been replaced or formally inspected?”
“Are there complete service records confirming oil changes at or below 15,000 km intervals?”
“Has the engine ever produced a rattling noise during cold starts?”
02M264 auxiliary electric coolant pump failure
MajorCommonCooling $650–$1,600 to fix
The M264 2.0T engine uses an electric auxiliary coolant pump to circulate coolant through the turbocharger and engine after hot shutdown, preventing heat soak damage, and to support the main water pump during peak load. The electric pump uses brushless motor technology but the impeller and motor winding are prone to premature failure, particularly in vehicles that frequently cycle through hot-shutdown events such as urban stop-start driving. Failure is typically electronic: the pump motor windings fail causing the ECU to log a coolant pump fault and illuminate the engine warning light or overtemperature warning. In some cases the pump seizes, causing localised coolant flow restriction and triggering an overtemperature event that forces engine power reduction to protect head gasket integrity.
Symptoms to notice
Engine coolant temperature warning light or overtemperature message on cluster
P0A9A or similar electric coolant pump fault codes stored
Engine power reduction warning linked to overtemperature protection mode
Coolant pump running audibly after hot shutdown then stopping prematurely
In failed cases: pump completely silent during post-run cycle
What to check
Scan ECU for P0A9A, P2591, or manufacturer-specific electric water pump fault codes. With XENTRY, perform electric coolant pump actuation test and verify flow audible at pump outlet. Inspect pump connector for corrosion and fretting. Check coolant for contamination that could block pump impeller. Verify pump is genuine Mercedes-Benz part or quality OEM equivalent - aftermarket pumps have high repeat failure rates.
Where to look: Auxiliary electric coolant pump: lower front of M264 engine, near main belt drive, connected in parallel with turbocharger coolant circuit
Ask the seller
“Has the vehicle ever displayed a coolant temperature warning or overtemperature message?”
“Has the electric water pump been replaced at any point?”
“Are there any stored or current fault codes relating to coolant or engine temperature?”
“What is the coolant service history - has it been flushed at recommended intervals?”
EngineMajor
SuspensionMajor
EngineMajor
EngineMajor
SuspensionMajor
EngineMajor
BrakesMajor
Fluid LeaksMajor
8 more documented faults on the Mercedes-Benz GLK
Symptoms, what to check, where to look and what to ask the seller — for every fault above. Free with an account, no card needed. One account covers one vehicle, so make it the car you’re actually looking at.
This page covers the model. Enter the plate of the actual car you’re looking at and see its year, engine, safety rating and register flags — free, no account needed.
Like any used car, it depends on the specific example and its service history. Across the 10 documented faults for the Mercedes-Benz GLK, the recurring problem areas are engine, suspension, and brakes. A Mercedes-Benz GLK with a full service history and no signs of the issues listed on this page can be a sound buy but each one needs to be checked individually before you commit.
What are the most common problems with a used Mercedes-Benz GLK?
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We've catalogued 10 known faults for the Mercedes-Benz GLK, covering engine, suspension, and brakes. Two are written out in full on this page. The rest — with the symptoms to notice, what to inspect, and typical repair costs for each — are free once you create an account.
How much do repairs cost on a Mercedes-Benz GLK?
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Most single repairs on the Mercedes-Benz GLK fall between $1,300–$3,200 at NZ independent-workshop rates. Some of the 10 documented faults cost less and a few cost considerably more, and no one car needs them all. Knowing which ones to look for before you view is what lets you negotiate the price down or walk away.
Should I get a pre-purchase inspection on a Mercedes-Benz GLK?
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Yes. A Mercedes-Benz GLK inspection focused on its known weak points is the single best way to avoid an expensive mistake. KickTyres gives you a guided, model-specific inspection plus a market valuation and negotiation figure for $17.90 far less than the cost of missing one of the faults on this page.