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One common issue with the Mercedes Benz C350e that drivers often report is rough shifting in the 7-speed automatic transmission. This is typically noticed when moving from first to second gear or when shifting down from third to second or second to first gear. Another frequently reported problem involves the camshaft adjuster solenoid, part of the variable valve timing system, possibly failing. Additionally, wear in the timing chain/balance shaft components can lead to the Check Engine Light turning on and various issues with drivability. Mercedes-Benz has issued a service bulletin with repair instructions tailored to the specific fault codes that are stored.
Certain issues frequently seen in a 2018 Mercedes-Benz C350e include blown fuses, malfunctioning sensors, and electrical problems.