At 603 MTech Autowerks, we see a lot of Mercedes vehicles come through our shop, and one of the most frequent issues we diagnose involves the M276 engine’s camshaft and camshaft adjusters. This problem can cause a variety of performance issues, and if left unchecked, it can lead to expensive repairs. In this post, we’ll break down what you need to know about this common problem and how to address it.
Understanding the Issue
The Mercedes M276 engine is widely used across different models, but it has a known weak point: the camshaft adjusters. These components play a critical role in controlling valve timing, optimizing engine performance, and improving fuel efficiency. Over time, the camshaft adjusters can wear out, leading to noticeable symptoms such as:
Rattling noise on cold starts – One of the most common early warning signs is a metallic rattling noise, especially when starting the engine cold. It is important to note that when this noise is present, it will not always trigger a check engine light, but if you get the vehicle scanned, there will often be a stored fault code. If the camshaft adjuster isn't fixed, the rattle can cause the pulse wheel on the camshaft to shift, which will then set a check engine light and result in excessive cranking. At this point, both the camshaft and the adjuster will need to be replaced.
Check Engine Light (CEL) activation – Fault codes related to camshaft timing or adjuster failure may trigger the check engine light. Common fault codes include P001177, P001277, P001685, and P001885.
Rough idle or misfires – A failing camshaft adjuster can cause improper valve timing, leading to an unstable idle or engine misfires.
Reduced power and acceleration issues – The engine may struggle to deliver power efficiently, affecting overall performance.
What Causes These Failures?
Several factors contribute to camshaft adjuster failure in the M276 engine:
Wear and tear – Over time, the internal components of the adjusters degrade, leading to loss of proper function.
Oil-related issues – Sludge buildup or low oil pressure can accelerate wear on the adjusters.
Extended maintenance intervals – Delaying oil changes or using subpar oil can contribute to premature failure.
Affected Vehicles
The M276 engine has been used in various Mercedes-Benz models, including:
C-Class (W204, W205) – 2012-2021 (C300, C350, C400, C43)
E-Class (W212, W213) – 2012-2021 (E350, E400, E43)
S-Class (W222) – 2014-2020 (S450)
GLC-Class (X253) – 2016-2021 (GLC43)
ML-Class (W166) (ML350, ML400)
GL-Class (X166) (GL450)
GLK-Class (X204) (GLK350)
GLE-Class (W166, W167) – 2012-2021 (GLE350, GLE43)
GLS-Class (X166) – 2016-2020
CLS-Class (W218, W257) – 2012-2021 (CLS400)
SL-Class (R231) – 2012-2020
The M276 engine was in production from 2010 to 2021, and while improvements were made over the years, camshaft adjuster failures remain a common issue across these models.
How to Address the Problem
If you experience any of these symptoms, it’s crucial to have your vehicle inspected as soon as possible. At 603 MTech Autowerks, we specialize in diagnosing and repairing Mercedes specific issues like this. Our expert technicians use factory-level diagnostic tools to pinpoint the problem and provide a reliable repair solution.
The best way to prevent costly repairs is through regular maintenance. Here are a few tips to keep your M276 engine running smoothly:
Stick to a strict oil change schedule using high-quality oil.
Address any check engine lights immediately to prevent further damage.
Listen for any unusual noises on startup and have them checked early.
Why Choose 603 MTech Autowerks?
As the only independent Mercedes-Benz specialist in New Hampshire apart from the dealership, we pride ourselves on offering dealer level service with a more personalized touch. Customers travel hours to have their Mercedes serviced at our shop because they trust our expertise and commitment to quality.
If you suspect camshaft or camshaft adjuster issues in your M276 engine, don’t wait until the problem worsens. Contact us today to schedule a diagnostic inspection and keep your Mercedes running at peak performance.
📍 603 MTech Autowerks – Your Trusted Mercedes-Benz Service Center in New Hampshire
☎️ Call us today to book an appointment!