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Loud Ticking Noise from Engine - 2017 C300

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Ashley M. · rep 0 · May 22, 4:21 AM · 1 replies · solved · Question

Hey everyone, I'm getting a really concerning loud ticking noise from the engine of my 2017 Mercedes-Benz C300, 4MATIC. It's most noticeable when the engine is cold, but it doesn't completely go away once it warms up. It sounds like it's coming from the top or front of the engine.

I've read a bit online about potential wrist pin or piston issues with the M274 engine. Is this a known problem for these cars? My car has about 70,000 miles on it, and I've been pretty diligent with oil changes and maintenance.

Has anyone else experienced this? What was the diagnosis and fix? I'm worried this could be a major repair.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:21 AM

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ClearTheCode guidance (Mercedes-Benz · Buying & ownership)

Summary: For Loud Ticking Noise from Engine - 2017 C300, work through these steps on your 2016+ vehicle:

  1. Confirm the symptom — note when it happens (cold start, highway, after fuel fill, etc.).
  2. Scan codes — save all pending/stored DTCs; don't clear until you've recorded them.
  3. Check TSBs & recalls — look up your VIN for open campaigns and known fixes.
  4. Inspect the obvious — related fuses, connectors, fluid level, and recent repairs.
  5. Test the common fix — follow model-specific service procedures; one change at a time.
  6. Escalate if needed — burning smell, no brakes, overheating, or stalling in traffic → shop visit.

Owner reported: Hey everyone, I'm getting a really concerning loud ticking noise from the engine of my 2017 Mercedes-Benz C300, 4MATIC. It's most noticeable when the engine is cold, but it doesn't completely go away once it warms up. It sounds like it's coming from the top or front of the engine.

I've read a bit online about potential wrist pin or piston issues with the M274 engine. Is this a known problem for t…

This is educational guidance, not a substitute for hands-on diagnosis.

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