TransmissionQuestionCommunity Starter

2023 Mercedes-AMG C43 4MATIC — shudder at light throttle around 40 mph

TruckTuner28Community StarterMay 11, 20262023 Mercedes-AMG C43 4MATICPennsylvania
2023 Mercedes-AMG C43 4MATIC, about 118,000 miles. I get a light shudder at steady throttle around 35–45 mph. If I accelerate harder or lift off, it goes away. Trying to figure out whether this sounds more like torque-converter behavior, engine misfire, or tires. Any data points from owners would help.
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TruckNomadCommunity StarterCommunity StarterMay 12, 2026permalink
If it were in my driveway, a pressure test beats staring at a dry driveway if the 2023 Mercedes-AMG C43 is losing coolant with no puddle. Save the big job until that test fails. This is from a 2023 Mercedes-AMG C43 in Pennsylvania with 118,000 miles. Verbal 'we'll take care of it' is not a plan. Heat soak after errands is the other window.
EuroMechanicish6Community StarterCommunity StarterMay 12, 2026permalink
Ask what changed right before it started. Move a coil or plug on the 2023 Mercedes-AMG C43 if it's cylinder-specific and see whether the code follows. That's the branch I'd chase this week. Just my two cents from doing this recently. Trying not to diagnose from the couch.
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