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My 2001 GMC Jimmy is blowing the ECM 1 fuse after it warms up. What do I do?

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  • yadayada
    yadayada Sep 16, 2010

    see your local GM dealer. don't keep replacing the fuse, the truck will burn down if u do.

  • mikejames37 Sep 16, 2010

    I'm pretty handy myself and hope that I can save the $450 the dealership will charge me. Any other idea's to help? I've checked all of the wiring near my muffler and did find a couple of wires that had been shorting out and fixed them. Still the same problem.

  • yadayada
    yadayada Sep 16, 2010

    sorry there is no magic cure for this.

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6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: 2001 gmc jimmy engine warm but heater blows cold air

Disconnect the heater hoses from the water pump and the intake manifold. Get a compressor and blow out the hose (put the air hose into the the hose that came off the mainfold. then flush the system and replace the antifreeze.

Posted on Dec 12, 2008

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picatudo
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SOURCE: 2001 gmc jimmy defroster-heater blower will not direct heat

you have a vacuum leak

Posted on Jan 07, 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

  • 32 Answers

SOURCE: My 2001 GMC Jimmy is not blowing warm/hot air.

Let the vehicle warm up to normal operating temprature, touch the heater hoses going into the firewall to the heater core, they should both be hot, if only one is hot the heater core is stopped up. If this is the case you will want to try flushing it before you replace it. If you have to replace it be prepaired to spend $400.00 or more depending on shop rates. NOTE: BE CAREFULL WHEN CHECKING HEATER HOSES YOU COULD GET BURNED! Thanks and good luck with your repair.

Posted on Nov 06, 2009

  • 1 Answer

SOURCE: 1999 gmc yukon blowing ecm-1 fuse any help?

Hey my name is Chris mine is doing the same thing and i cant figure it out blows the fuse as soon as i turn the key on? any help

Posted on Oct 30, 2010

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The ECM on the jimmy, is located on the passenger side fender well by the overflow tank. But before replace the ECM, inspect the fuel pump and fuel pump relay. The ECM sends power to the fuel pump relay and if the relay has gone bad will cause the fuse to blow which will kill the the power to the ECM, in turn kill the electrical power to the ignition system.

Start by removing the fuel pump relay and swap it with another relay and see if the fuse will blow again, if is does. Disconnect the fuel sending unit wire harness at the frame and see if the fuse blows again, if the fuse stays good. Chances are your fuel pump has gone bad or the fuel filter is dirty/clogged causing your fuel pump to draw more amp and will need to be replaced or the wire harness from the frame to the sending unit has a short which is common on older Jimmy's.

Here is a link to the electrical harness throughout the Jimmy.
http://www.compnine.com/index.php?t=...lid=6872&uid=1

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Check the ECM/BAT fuse. this fuse controls the ECM and the fuel injection circuit. If the fuse is ok, you need to check for voltage at the spark plug. Pull the #1 spark plug. If the cylinder is getting fuel the plug will be wet with gasoline. Put the spark plug wire back on the plug. Now crank the starter and look for a spark from the spark plug electrode. If you can let me know what you find from these tests, I can help you determine the next course of action.

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there is a short behind the dash somewhere i had an 06 cobalt kept blowing that fuse. it pissed me off couse when it wout blow i lost my boost gauge so i put a circuit breaker in it WRONG thing to do i wnt in to donut shop like always one morning came out n car was full of smoke pulled the dash apart n found that there was wires pinched between the dash and firewall costme a new wire harness and a bcm and a computer flash. live n learn iguess

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1 Answer

2001 gmc jimmy 4.3l.idles low and will stall when put into gear unless engine is reved up a little.


Clean the Idle air control valve (IAC), it's located by the throttle body so the best thing to do is give the throttle body a good cleaning with throttle body cleaner. Do not use carb cleaner, it's to corrosive for the gaskets used on the throttle body's. Just follow the instruction on the spray can and after your done putting everything back together. Turn the ignition key's to the run position for 10 seconds and then off for 10 seconds to reset the IAC. Start the engine and let idle for 1 min and go for a test drive. If that does not work, turn the ignition to the run position and pull the ecm(BATT) fuse out for 30 seconds and then place it back in start te engine. The engine may stall but let it, don't touch anything. Just start it again and let idle for 1 min then go for a test drive. The ECM is just relearning the sensors like the first time the jimmy was driven off the assembly line. Good luck and hope this helps. Keep me posted be glad to get your jimmy running 100%. 

Jul 06, 2009 | 2001 GMC Jimmy

1 Answer

2001 Jimmy shut down while driving. The ECM1 fuse blew. Replaced fuse and it blew. disconected circuits related to ECM1 fuse. reconected one circuit at a time. Fuse did not blow and Jimmy started. Why?


The first thing you should do is to locate the oil pressure switch/sending unit.

It's a single wire terminal with plastic connect sensor from the engine block.


This switch serves two functions.

1) provide oil pressure reading

2) disable the fuel pump relay in event of oil pressure loss.

===

When this switch is failing to provide the correct pressure to the ECU. The wiring harness can overheat and eventually create a short.

ECM1 fuse blow is because the harness is grounding/shorting.

===

DO NOT drive the truck until you change the oil pressure switch.

After you change the switch,you should spend sometime to inspect the wiring between the fuel pump relay,ECU and fuel pump.


Please post up day on the comment window/page.

I will follow up on it later.


Good luck.

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1 Answer

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Disconnect the heater hoses from the water pump and the intake manifold. Get a compressor and blow out the hose (put the air hose into the the hose that came off the mainfold. then flush the system and replace the antifreeze.

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1 Answer

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That fuse provides power for the fuel pump. Either your fuel pump is blowing the fuse or there is a shorted wire.

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