The M276's four camshaft adjusters wear internally and fail as a family. We replace all four in one teardown at your home — so you never pay for this access twice.
The 2010–2016 M276 V6 in the E350 and CLS350 varies its valve timing through four camshaft adjusters — one hydraulic phaser on the end of each cam, swinging timing on the engine computer's command. Internally they're vanes, springs, and a locking pin, all wearing with every heat cycle. As the internals wear, an adjuster gets slow to answer, then noisy — an unlocked, worn adjuster rattles at cold start before oil pressure arrives — and finally inaccurate enough that the computer flags it.
That's where the code spread comes from: faults across the P0010–P0023 range, covering actuator circuits and cam-position performance on both banks. The drivability matches — rough idle as timing wanders, flat spots, an engine that's lost its crispness. Because all four adjusters share the same oil, the same heat, and the same kilometres, a fault on one is a progress report on all four.
Which is exactly why the smart repair is all four at once. The teardown to reach one adjuster is the bulk of the labour to reach its neighbours, and replacing a single unit leaves three equally worn ones behind the same access you just paid for. Done as a set, with timing verified with locking tools, the M276's valvetrain timing is renewed in one pass — and this job never comes back.
If your Mercedes-Benz is doing any of these, this is the likely cause:
Worn adjusters rattle metal-on-metal at every cold start and shed wear debris into the oil that feeds the rest of the valvetrain. Timing accuracy keeps degrading — rough idle today, fault-driven limp behaviour later — and an adjuster that fails outright can let cam timing wander far enough to threaten the engine itself. Four worn units don't get better; the set replacement now is the version of this repair with no sequel.
Yes — it's top-of-engine precision work with the timing locked in place, all of it doable in your driveway over a full day. We bring the Mercedes timing tools and every part before starting, and the car never moves until it's running right.
Four genuine adjusters are real parts money, and the careful teardown-and-verify labour around them fills a day at dealer rates. We give you one flat quote for the complete set — adjusters, gaskets, oil, verification — before any work starts. One known number for the finished job.
We could, but the other three have identical wear and the access overlaps almost completely — singles are how owners end up paying this job's labour two or three times. We'll quote it both ways if you want, but the set is the honest recommendation and the cheaper path over any horizon longer than a few months.
Solenoids are the cheaper first suspect and we test them as part of diagnosis — but on a high-kilometre M276 with cold rattle plus rough idle, worn adjusters are the usual truth, and solenoid swaps alone bring the codes back. We confirm at your home before quoting, and the solenoids get inspected as part of the job either way.
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