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Username Post: ECM-1 Fuse Keeps Blowing        (Topic#248002)
Forum Newbie
Posts: 1

Reg: 08-23-10
08-23-10 03:00 PM - Post#1965651    

I have a 1999 GMC Suburban and My ECM-1 Fuse keeps blowing. Thursday I was driving to the store and all my gages fail the right and my engine shut off. I had to have it towed to my house. The ECM-1 Fuse was burnt, so i changed it. However, now when I turn my switch to on the fuse blows. I don't even have to turn the switch far enough to crank the engine and the fuse blows. What could be wrong.

Senior Member
Posts: 1227

Loc: Wickenburg, AZ
Reg: 10-23-03
08-23-10 06:08 PM - Post#1965793    
    In response to cab3143

Check everthing on the ECM 1 circuit its in the wiring diagram in the FSM. Could be the PCM,injectors or wiring.

K1500 04 Silverado EXT

Posts: 27804

Reg: 01-06-02
08-23-10 07:43 PM - Post#1965861    
    In response to cab3143

Almost definitely a short, has the truck been in deep water or super heavy rains or anywhere the connectors or PCM could have gotten wet? If not look for exposed wires making contact with a ground source or another circuit.


DON'T mess with Old Men, we didn't get old by being, STUPID!!!

"The veneer of civilization is very thin!" (Arlo)

Super Senior Member
Posts: 13996
Loc: Baltimore, MD
Reg: 11-27-04
08-24-10 04:10 AM - Post#1965954    
    In response to Randy_W

I agree with Randy. It is a short somewhere. You'll have to get a wiring diagram to trace the related harnesses. It could be an internal short in the computer itself or a broken wire going to ground. The first thing I would do is unplug the computer and turn the key to the on position and see if it still blows a fuse. This will tell you if it is something that is on the computer harness or the computer itself if the fuse does not blow. If it still blows, then it is something that does not get power on that harness. The gauges failing first may be a clue as tot he culprit, but I am not that familiar with our trucks in that regard.

Some days it's not worth chewing through the restraints.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon

Valued Contributor
Posts: 2956
Loc: Rochester, NY. USA
Reg: 03-13-00
08-24-10 07:45 AM - Post#1966053    
    In response to wagonman100

check for chewed injector wires.

Philip Ferrera
1977 Chevelle
1977 Malibu Classic
1986 Grand Prix
1995 Tahoe
2003 Impala LS
2004 Ski Doo REV
Street Machines of Rochester NY

Forum Newbie
Posts: 3

Reg: 08-08-13
08-08-13 09:49 AM - Post#2370356    
    In response to cab3143

Hi there, Did you ever figure out what was causing the blown ECM 1 fuse?

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