Question about 2001 GMC Sonoma Extended Cab
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Posted on Jan 02, 2017
SOURCE: blows fuses
Generally speaking, a fuse 'blows' because too much current is drawn through that circuit. In this case I suspect a 'short-to-ground' or a bad voltage regulator (inside the alternator in a GMC). First, I would check the alternator's output voltage. Easiest just to look at your guage. Up to 14 1/2 volts is normal on a GM (with truck running), if it's higher - you need a new alternator. If it's under 14 1/2 volts, you
MUST find the short. Unless you have the specialized tools, (short-circuit finder, voltmeter, wiring
diagrams, etc.) this should be left to a competent automotive electrical shop. It could be as simple as a wire's insulation worn off or a short 'inside' the ECM (you truck's engine control computer). No matter what, one trip to a competent mechanic will probably be cheaper than continually replacing the computer and/or towing bills. Good luck!
Posted on Nov 24, 2008
most likey the blower motor going out ,replace the blower resister also these work together and control ur speeds ,it may have got weak
Posted on Jul 06, 2009
The only other things on that circuit are your PCM(power control module) and the fuel pump/oil pressure switch. You can start with that but it is more than likely a ground somewhere on that circuit. If this helped four thumbs up please.
Posted on May 18, 2010
SOURCE: I have a 1991 GMC
ECMB fuse it is hot at all times and sends power to the ECM ( computer cavities c15 and b1), oil pressure switch (to power the fuel pump when there is pressure) and the fuel pump relay. All orange wires.
So while checking those items also check the fuel pump and all their circuits.
I think the last person that had this problem had replaced the fuel pump and that fixed it.
I got this info from a chevy truck owners forum and also researched other other sites, the most common thing to blow the ECMB fuse is a shorted fuel pump or fuel pump circuit wiring, disconnect the fuel pump at the tank, if the shorts stops and fuse dopesn't blow replace the in tank electric fuel pump.
Posted on Oct 28, 2010
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