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I have a 91 GMC suburban that blows out the ecm fuse?

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  • Cars & Trucks Master
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There is excessive current draw in the ecm for this to happen. I suspect that the ecm has an internal short. If you can get it checked that would be the way to go. If by chance you have had a jump start prior to this then it will be the ecm unit.

Posted on Jul 17, 2013

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Posted on Jan 02, 2017

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SOURCE: blows 15amp ecm fuse

replace ignition switch

Posted on May 30, 2009

ghost4548
  • 776 Answers

SOURCE: 03 hyundai santa fe blows ecm fuses after car is warm up and you

There is obviously a short circuit somewhere. Best solution, take vehicle to nearest Hyundai Service Center, pay diagnostic fee. They will give you an estimate of repairs (parts, labor, tax, time-frame, etc.). This way you'll find out EXACTLY what the problem is and what's required to fix it.

Posted on May 31, 2009

centralvalle
  • 386 Answers

SOURCE: ecm fuse keeps blowing

just fixed this problem, change your fuel pump module, fuel sending unit shorts out on fuel level swing arm blue wire... unfortinately you must replace it as unit because of the design, fuel pump and tank guage fuel level sending unit are a one peice item, fuel tank has to come out to change unit, about a $ 700.00 repair too... fuel pump module runs about 350 to 700 $ depending on aftermarket or factory, try to find one with a lifetime warranty even if it is $ 50.00 more worth it..labor is about $ 250 to $ 400 depending on shop labor rate... definate problem though I ahve no doubt, common problem on GM... please rate my help, thanks...

Posted on Aug 06, 2009

  • 538 Answers

SOURCE: my transfer case fuse keeps on blowing cant find

Check the four wheel drive actuator on the front axel. It's on the front right side of the front differential housing. It's round with a big hex on it where you would put a wrench, I think it's 1-1/4". Anyway, follow the wires there's a plug about 6 inches away, unhook the wires going to the actuator. Now see if it still blows the fuse, if the fuse don't blow the actuator is the problem. It just scerws out and the new one screws in and hook up the wires. This is a fairly common problem with those trucks. On the early K series GM had the four wheel drive and the heater fan on the same circuit. The actuator would go bad and blow the fuse so now your stuck in the snow with no heat. I think GM changed that in the later years.

Posted on Jan 02, 2010

lesabre1972
  • 474 Answers

SOURCE: my '91 s 10 ecm b fuse keeps periodically

Try changing the fuel pump or the fuel pump relay ECMB fuse controlls the pump control.

Posted on Feb 05, 2010

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The key is to find out what is causing the ECM fuse to always blow. With just the key on try and see if any codes are set in the ECM. If not, try a new ECM. If the fuse still blows, then disconnect all accessible electrical for everything, including radios, accessories, relay boxes,etc. except the ECM. If the fuse still blows, then probably something wrong with the wiring to the ECM. If it doesn't blow then start hooking up things one at a time until it blows again. Once it blows, that is your problem.

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Case: 1990 GMC 1500 SLE Suburban. Ran just fine, then the ignition shut off when I hit a random bump or pothole. Cost me a $750 tow before I got on here and did the wiggle test. The fuse stopped blowing. I will update if my fuel line/insulation idea didn't work, but I think it will. I will also tape every exposed wire with electricians tape. . .

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1 Answer

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hi, i have seen this problem before, i am a trained ase mechanic who works in a shop weekly. in my case, the suburban was a 91, it started by blowing the fuse randomly, then as it got further along, the ecm b fuse would blow consistantly as you describe. I found the problem to be in the wiring harness between the fuse block and the electronic control module on the pink/black power wire. It had become hot next to the radio and the insulation had melted into a direct ground to the ecm. then as time passed, it melted six other wires till it hit battery power. this is when it shorted the fuse all the time with key in or out. You should start by checking behind the glove box at the wiring harness going into the ecm, if you can get a schematic for the wiring, it would be better advised. See if you can find the Pink and black stripe wires(there maybe several of them as they power everything from egr solenoid to oxygen sensor possibly) and look for melting of the insulation. If you do find this to be the case, technically you should replace the whole harness, but it is possible the cut and splice in new wires. If any other wires are affected, you should replace these also. Check the whole length of the affected wires, they may have shorted all the way up or down. If this sounds like a big deal, it is! so, good luck, hope this helps.

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