When I accelerate from stop, the transmission jerks from 1st to 2nd. I took it to dealer and they said they noticed the jerk but refused to fix it as no codes were stored. They also checked automatic transmission fluid level. They said its normal to like models at this time and asked me to bring it back if any lights come up. Has anyone else noticed this issue and what's the resolution ?. Is it required that codes show up for dealer to fix the problem under manufacturer warranty ?.