The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

2017 C300 Rough Shifting - Time for Transmission Fluid Service?

0

James R. · rep 0 · May 22, 4:19 AM · 1 replies · solved · Question

My 2017 C300, with about 70k miles, has started to feel a bit rough when shifting, especially from 2nd to 3rd gear. It's not constant, but noticeable when it happens. I've heard Mercedes has specific intervals for transmission fluid changes, and I'm wondering if I'm due.

Is this a common issue for the W205 C300 at this mileage? Could it be something else entirely, or is it likely just worn-out fluid? I'm trying to figure out if this is a DIY job or strictly dealer territory given the complexity of Mercedes transmissions.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:19 AM

0

ClearTheCode guidance (Mercedes-Benz · Maintenance & DIY)

Summary: For 2017 C300 Rough Shifting - Time for Transmission Fluid Service?, 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: My 2017 C300, with about 70k miles, has started to feel a bit rough when shifting, especially from 2nd to 3rd gear. It's not constant, but noticeable when it happens. I've heard Mercedes has specific intervals for transmission fluid changes, and I'm wondering if I'm due.

Is this a common issue for the W205 C300 at this mileage? Could it be something else entirely, or is it likely just worn-out fl…

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

Menu

Help & account