Allen_h

Hey, I have a 2003 Suburban Z71 5.3 non flex that keeps blowing the PCM 1 fuse.. This first happen about 2 weeks ago it went out and I replaced it started right up and we went on our way, now last night it blew out and every time I turn the switch on it blows, after some playing around I got it to start by putting it in nutral and rolling it, then as soon as it's placed in drive the fuse blows again...got it to start by rolling it foward and replacing the fuse again this time I backed it up in reverse it worked fine, so I drove it home in reverse about 4 miles down our dirt road, soon as I got it to the house I placed it in drive and pulled up about 3 feet and the fuse blew.

Any help would be greatly appreciated

Allen_h

Found my problem the wires that run to the fuel composition sensor fell onto the front drive shaft and it rubed about 3 wires into and they were laying on the front drive shaft

Got her all patched up.

2003 Chevrolet suburban blowing Pcm1 fuse

Chevrolet Suburban blowing pcm1 fuse



PCM1
Powertrain Control Module (pcm)

Mass air flow (MFS) sensor

Evaporative Emissions (EVAP) canister purge solenoid

Fuel composition sensor

Secondary fuel pump relay (if you have 2 tanks)