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Mercedes-Benz2011–2017 Critical issues documented

Mercedes-Benz CLS C218: common faults & what to check

The C218 is the Mercedes-Benz CLS built 2010–2018. Of the 5 faults documented for the CLS, 5 apply to this generation, each with its symptoms, what to inspect and a typical repair cost. Free, no account needed.

Check this exact Mercedes-Benz CLS

  • Money owing
  • Written off
  • Accident claims
  • Odometer history

An Australian plate goes to the A$17.90 Vehicle Check: money owing, write-off, stolen and rego. Full History adds past kms, accident claims and market value from A$24.99. The free fault check for this model needs the generation and engine, pick them below.

5

Documented faults

Critical

Most serious

≈A$1,660–4,140

Typical repair

3

Systems covered

You're looking at the C218

Everything below is narrowed to this variant. Pick a different one to change it.

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Now narrow it to the engine

A 1.8 and a 2.4 of the same car do not fail the same way, so the faults below narrow to the engine as well as the year. Free, no account needed.

A 2012 Mercedes-Benz CLS is the C218 generation (2010 to 2018).

Start your free check on this Mercedes-Benz CLS

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Mercedes-Benz CLS C218

Free. The paid plate check is separate, and stays optional.

Can't confirm for this car

Mercedes-Benz CLS · 2012

Narrowed to the year. No engine is recorded for this vehicle. Pick an engine to see which faults apply.

Tell us the engine, or check the engine code on the car, before relying on this.

  • No engine is recorded for this vehicle.

matched on year only

What to look out for

We have not documented any faults for the exact Mercedes-Benz CLS you picked.

That is a gap in our research, not a clean bill of health — it does not mean this combination is trouble-free, and it is not a reason to skip the checks. Every one of the 5 faults documented across the Mercedes-Benz CLS is still listed further down this page.

Show every year and engine again

All 5 issues for this one

Documented for the exact year and engine you picked. Tap an area to open it.

1 rated critical
Only with a certain gearbox: 1 issueEach one names the gearbox it affects, for example the CVT automatic. Check which gearbox this car has.

017G-Tronic Plus 722.9 conductor plate (transmission control unit) failure, stuck in limp mode

On the test drive, drive for at least 20 minutes so the gearbox is fully hot, as these faults often only appear warm.2011–2017TransmissionRead the full fault: symptoms, where to look, what to ask the seller
Depends on the exact engine or version: 4 issuesDocumented for a specific engine or version we could not confirm from what you picked. Check the engine code on the car.

01Intake camshaft adjuster failure and timing chain tensioner cold-start rattle (M276 3.5 V6, CLS350)

Ask the seller not to start the car before you arrive and put your hand on the bonnet to confirm it is cold.petrol2011–2017EngineRead the full fault: symptoms, where to look, what to ask the seller

02Delphi piezo fuel injector failure (OM651 2.1 diesel, early CLS250 CDI)

diesel2011–2012Engine
OccasionalEngine ≈A$1,100–5,060 to fix

Can't confirm for this car

Early OM651 2.1 four-cylinder diesels, including the CLS250 CDI, were built with Delphi piezo injectors that fail or leak, causing rough running, limp mode and cut-outs, and a leaking injector can in rare cases damage a piston. Mercedes ran a worldwide service measure (not called a recall) on about 300,000 OM651 engines, first swapping in updated piezo injectors and later replacing them with solenoid injectors; the factory changeover to solenoid injectors happened during 2012. Cars that missed the measure, or had only some injectors replaced, are the risk, and Mercedes no longer does this work free on cars this old.

A single common-rail diesel fuel injector photographed against a plain background.Example of the part — not this vehicle

A common-rail diesel injector. Contamination damages the nozzle at the tip.

Panoha · CC BY-SA 3.0 · Wikimedia Commons

Symptoms to notice

  • Engine warning light and limp mode with loss of power
  • Rough running, judder or misfire, especially at idle
  • Engine cutting out while driving
  • Hard starting or a diesel knock that was not there before

What to check

  1. Start the engine and listen at idle for uneven running or a lumpy, shaking idle, then on the test drive accelerate firmly through the gears and check for hesitation, judder or a limp mode warning.
  2. Open the bonnet and, with the engine cover lifted if it pulls off by hand, use a phone torch to check whether the injectors have small return pipes connected to them: the updated solenoid injectors do and the original piezo ones do not.
  3. Ask for paperwork showing the injector service measure was carried out and look for the sticker on the camshaft cover with injector codes crossed out by the dealer.
  4. If a workshop inspection is possible: have the injector quantity correction values read with a Mercedes-capable scan tool and a return-flow (leak-off) test done.

Where to look: Top of the engine under the plastic engine cover, one injector per cylinder

Parts involved: Fuel injector.

Ask the seller

  • “Has the injector service measure been done by a Mercedes dealer?”
  • “Were all four injectors replaced or only some?”
  • “Has the car ever gone into limp mode or cut out?”

03Oil cooler seal leak in the engine valley (OM642 3.0 V6 diesel, CLS350 CDI / BlueTEC)

The OM642 3.0 V6 diesel has its oil cooler buried in the valley between the cylinder banks, sealed by rubber seals that harden and leak.diesel2011–2017Fluid LeaksRead the full fault: symptoms, where to look, what to ask the seller

04Upper timing cover and camshaft cover oil leaks (M276 3.5 V6, CLS350)

petrol2011–2017Fluid LeaksRead the full fault: symptoms, where to look, what to ask the seller

Mercedes-Benz CLS faults in detail

Narrowed to the Mercedes-Benz CLS · 2012. Each of these has its own page: the symptoms, where to look, what to ask the seller and what the repair costs. Free, no account needed.

7G-Tronic Plus 722.9 conductor plate (transmission control unit) failure, stuck in limp modeMajor · TransmissionIntake camshaft adjuster failure and timing chain tensioner cold-start rattle (M276 3.5 V6, CLS350)Critical · EngineOil cooler seal leak in the engine valley (OM642 3.0 V6 diesel, CLS350 CDI / BlueTEC)Major · Fluid LeaksUpper timing cover and camshaft cover oil leaks (M276 3.5 V6, CLS350)Major · Fluid Leaks

Other Mercedes-Benz models

Mercedes-Benz C-Class45 documented faultsMercedes-Benz E-Class26 documented faultsMercedes-Benz A-Class23 documented faultsMercedes-Benz GL-Class5 documented faultsMercedes-Benz W1635 documented faultsMercedes-Benz S-Class22 documented faults

Mercedes-Benz CLS buyer questions

Is the Mercedes-Benz CLS reliable?

Like any used car, it depends on the specific example and its service history. Across the 5 documented faults for the Mercedes-Benz CLS, the recurring problem areas are engine, transmission, and fluid leaks. A Mercedes-Benz CLS 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 CLS?

We've catalogued 5 known faults for the Mercedes-Benz CLS, covering engine, transmission, and fluid leaks. All 5 are written out in full on this page, with the symptoms to notice, what to inspect, and typical repair costs for each. Free to read, no account needed.

How much do repairs cost on a Mercedes-Benz CLS?

Most single repairs on the Mercedes-Benz CLS fall between ≈A$1,660–4,140 at independent-workshop rates (an approximate guide in Australian dollars). Some of the 5 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 CLS?

Yes. A Mercedes-Benz CLS 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 with AI photo analysis from A$28.90, far less than the cost of missing one of the faults on this page. For a big purchase, a mechanic's pre-purchase inspection on the car you settle on is still worth it.