I cannot get a reading from computer port?
The factory alarm on a GMC Sierra pickup truck can be reset by removing the fuse. Take the fuse out for 10 seconds and replace it. This will reset the alarm.
where is the fuel pump reset button or relay switch located on a gmc sierra 2003 and how do i get to it?
Gmc does not use inertia/reset switches.
Remove the positive terminal cable from the battery using your pliers or wrench.
unhook battery, step on brake pedal, wait 30 mins.
Gm vehicles do not have inertia/reset switches.
There is none.
GM vehicles do not use inertia/reset switches
Have vehicle scanned to have stored codes erased
Transmission control system malfunction
No. Gmc doesn't use reset switches. The fuel system is computer controlled with relays.