Put a new tune in my 02 tahoe earlier. It started up and idled fine for about 10 minutes. Went to back up out of the driveway, stopped and switched to drive and the truck just shut off. Tried restarting and it just cranked. Pulled the truck back up in the yard and the gas gauge went from half tank to empty. Smacked the tank thinking it was the pump, nothing. Got the code reader out and it showed up the P0178 fuel composition sensor voltage low code. Checked wiring everywhere i could think of and all was good. Decided to check fuses and got to the ECM1 fuse under the hood and it was blown. Was a 10a in there but all i had was a 20. Put it in and it fired right up no problem. I went into the tune and disabled the flex fuel and turned the codes off to no error reported. Drove the truck around a few miles and came back with no issues. I was wondering if I might of fixed the issue this way or just bandaided it lol. Anyone else ran into this issue before? I dont plan on running any type of flex fuel and only run 89 octane pump gas through it. Can I just keep the tune the way it is with the flex disabled and the codes turned off, or will I need to put an adapter between the fuel lines to totally bypass it incase it fails again?
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