Is it normal for the 2017 Jeep Compass 1.4T 2WD Family Enjoyment Edition to occasionally make a "thud" sound when shifting into reverse or forward gears? It seems like it's coming from the transmission. Has anyone experienced something similar?

My car was registered in 2018 and has just over 10,000 kilometers. It's been in the repair shop for half a month now. They said it's the electronic rocker arm that's broken. First, they tried replacing the spark plugs, but that didn't work. The ignition coil didn't work, and neither did the injectors. Then they said it's the electronic rocker arm. Wow, it costs 12,000. Sigh, they suggested I replace the engine, which is around 15,000. I don't even know what to do. This car isn't worth 50,000 now, and fixing it costs over 10,000.