P0455 & P0442 ECU Fault Log H3 Hummer

About year ago my ECU light came on in my H3 Hummer, noticeably after some fun off-road. I grab my cheap Chinese OBD-II to Blue Tooth scanner from eBay, it doesn’t work with Fords, and open the Android application “Torque” . The scanner had no problem grabbing the code and I was able to see the error report in the computer. Fault log report generated by Torque for Android —————— Vehicle VIN: 5GTDN136X68227871 Vehicle Manufacturer: Unknown Vehicle Calibration ID: 12606370 12601134 1260 Current Fault Log —————— P0455: Evaporative Emission Control System Leak Detected (gross leak, check fuel cap, piping etc) P0442: Evaporative Emission Control System Leak Detected (small leak) Pending Fault Log —————— ECU reports no pending faults Historic Fault Log —————— ECU reports no historic faults Other discovered fault codes (possibly pending, current or manufacturer specific) —————————————————- ECU reports no other fault codes logged End of report. After some research I had decided one of two parts had to be giving the ECU the errors, the 20907779 GM Original Equipment Vapor Canister Vent Hose or the 25827646 Fuel Tank Cap. I checked the Fuel Tank Cap over and it looked in great condition, must be the vent hose. Although I ended up buying both parts, because at this point I’m tired of having the engine light on. The day when the parts got delivered to my door, I didn’t have time to install the Vapor Canister Vent Hose. But I was able to quickly put the new Fuel Tank […]