This 2018 Chevy Traverse has a check engine light indicating code P0455, which means a large EVAP leak. I initially checked for obvious leaks but found none, so I used a smoke machine to detect emissions leaks. I didn't see any leaks up front, but I found a big leak in the rear of the vehicle right by the gas cap, suggesting a possible issue with the charcoal canister or an emission line. I'll need to raise the vehicle to investigate further, as something may have struck it on the road. At least

Map sensor code Chevy Colorado