I initially bought this car about a month ago, after about 100 miles of driving the gas cap message would come up. I replaced the gas cap with a new one. Check engine light finally came up with a P0455 code. I replaced the charcoal canister, purge solenoid, and the evap solenoid behind the rear axle. now no code or gas cap message. I even replaced the entire gas filler neck, however evap will not ready up and I have driven about 1200 miles. Any Ideas? also there is an issue with the gas guage sending unit. when I fill up the tank it only reads at 3/4. Is there something else I should be looking to replace?
RepairPal Certified shops can diagnose and repair your 2007 Cadillac Escalade EXT. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Hello, your evaporative emissions system "readiness" will not set until all conditions are met to make it work. This is something you can't really force to happen. Read this article about readiness of monitors:
https://repairpal.com/drive-cycle-issues
You do have to have between 1/4 and 3/4 of a tank of fuel for the evaporative monitor to run and set -- perhaps your fuel level and gauge issue is causing a disruption here?
