Experiencing rough shifts in our long-term 2019 Mercedes-Benz A 220, we decided it was time to seek professional help. The usually smooth driving experience had deteriorated, particularly in the 1-2 upshift range at around 15-20 mph, across both sport and comfort driving modes. Hoping to resolve this issue, we took our A 220 to the local Mercedes-Benz dealership for a thorough inspection.
After two days, the dealership provided a detailed report outlining their diagnostic process. They were able to replicate the rough shifting issue in approximately half of their test drives. Using the Mercedes-Benz diagnostic system (SDS) and a battery charger, they performed a quick test but found no fault codes related to the transmission problem. Following a recommendation from the shop foreman, they checked the DCT (Dual Clutch Transmission) fluid level, which was found to be within the specified range. Ultimately, the dealership concluded that performing a full basic transmission adaptation was the appropriate next step to address the harsh shifting. This adaptation process is designed to relearn the shift and wet clutch application characteristics of the DCT. After completing the transmission adaptation via SDS, a quality control road test was performed. The dealership reported a 99% improvement in shift patterns and clutch application in both comfort and sport modes post-adaptation.
Upon picking up the 2019 Mercedes-Benz A 220, the service advisor described the performed services, highlighting the transmission adaptation. However, they stopped short of acknowledging any mechanical fault, attributing the previous rough shifting to the inherent nature of DCT transmissions. While DCTs can sometimes exhibit minor jerkiness, the degree of roughness we experienced in our A 220 felt beyond normal, especially considering its initial smooth performance. Despite the service advisor’s explanation, the dealership did not charge for the service, leaving us slightly unclear on the exact nature of the issue and its resolution. With the A 220 back in our possession and supposedly “fixed,” the real test would be on the road to determine if these adaptations had genuinely eliminated the rough shift characteristics.
Beyond the transmission concern, our 2019 Mercedes-Benz A 220 also signaled the need for its 10,000-mile service. Scheduling an appointment was straightforward, and the dealership accommodated us quickly. The service encompassed a standard oil change, tire rotation, and brake inspection. While the brakes were in good condition and the oil change proceeded smoothly, a tire wear inspection revealed irregularities, leading to a recommended wheel alignment. Consequently, the 10,000-mile service expanded to include the alignment, tire rotation, oil change, and general check-up. The total cost for this service amounted to a significant $617.59. Breaking down the expenses, the wheel alignment was $229.95, the oil change (including 6 quarts of Synthetic 5W40 and a filter) was $285.69, and the tire rotation and balance cost $101.95. Due to time constraints, we opted for the closest dealership and didn’t negotiate on pricing. However, given the considerable expense of this 10,000-mile service, we are considering exploring independent service shops for the upcoming 20,000-mile maintenance to potentially reduce costs.
