Question about 2001 Chevrolet Silverado 2500HD

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I have a 2001 Chevy Silverado 2500HD 8.1L the truck loses power and will shut off for no reason, and does not matter what speed, i could be sitting at a light or doin 70 mph down the freeway and it still does the same thing. I have been told that the crankshaft position sensor could have something to do with it. Have had it in the shop several times, and they cannot find anything wrong, the only thing that was coming up as a problem was the O2 sensor which i have replaced.

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  • ksridge101 May 13, 2010

    Yeah i have had the fuel pump checked, they said that it was reading fine, and that they couldnt simulate the problem that i was havinig well it has been about two months and it is still doing the exact same thing i also saw that Chevrolet had a recall in 06 for the crankshaft position sensor, called on that and it has been replaced, but is giving the same problem.

  • ksridge101 May 17, 2010

    New development today the truck will not start at all. It turns over, but will not start, replaced the sparkplugs and battery, but to no evail. any suggestions.

  • ksridge101 May 20, 2010

    It has the 8 cyl 8.1L, took it to the shop, and they found that the fuel pump is bad. So I am going to have that replaced, but have another question for you. Do you know when they sale the fuel pump if california emissions are required?


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The O/2 senser will not make it qit but the fuel pump and the ingition module will. does it start right back up? Fuel pumps heat up and quit sometimes opened the relay and it cools and or is cycled as you try to restart and it reclosesand you drive on. an amp test on the pump draw or even a scope test of the pump may isolate it as the bad boy. Pumps build up pressure and heat if the fuel filter is partly clogged. Change the filter as preventale maintanance and try to blow though the old one if it blows though hard it may be too late for the pump and you may have to change it too as the stuff that went thohg the pump that stopped up the filter. You only can heat the pump so much before its bad if you find it is change the relay also and check the ground wire where it connectes to the frame. The hanger unit that the pump is in fails too and it has to be changed on most models as you can't buy the pump any other way because it fails as often as the pump or is damaged as the pump fails. The ingtion ciol can fail, but not likly to start right back up you gota wait. The ECM cando it too but is not a common problem. Their may be engine control codes in the computer to help you determine the problem

Posted on May 13, 2010

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  • John P Schwantes Jr May 13, 2010

    the fuel pump and it's control is most likly. Does the car start right back up or do you have to wait awhile? If it starts right away the fuel pump relay is located in the underhood relay center The horn relay and the fog light relay are the same part and can be swapped around. if swappping relays changes how long it runns before it stops the fuel pump and filter are bad. Even a bad fuel pump can put out the right presure when tested only a o scope can see a drop out in the motor and on and amp gauge can test how much power the pump draws. if it draws more than 5 amps 10 on start up it's bad. sure it works but when its drawing too much power it's either pushing fuel past a clogged fuel filter or a stuck fuel pressure regulator ( pressure too high) The hot pump swells up and quits turning as soon as it stops the relay kicks out till you restart the truck. then the heat up process starts up al over again. It sounds like it runs good when it's running and it might not happen some days? The ingtion module is sitting next to the dist on the 4.3 and 5.7 8.0 this part can heat and fail some auto prts stores can test this part and sometimes find a heat up failure if it does the coil is bad so goes the wisper down the lane effect

  • John P Schwantes Jr May 18, 2010

    need to check the basics. Spark fuel and compression, In that order. Spark ( remove a plug wire from a plug lay it on medal and crank the engine watching for spark, You don'y even have to see it you'll be able to hear it too) Fuel ( add some to the air intake if it flashes off, ( starts and dies ) ) The fuel pump quit or the fuel system is stopped up. Rember it has to have spark for this to be a good test. Compression ( it normally doesn't come and go and overheating is the first cause and timing chain failure is next) You've never mentioned which engine is in this truck and their are 5 possible and others in special apps. so further study I need to know what engine? Is It a desiel? 6 cylinder 8 cylinder ( which one) 10 cylinder?

  • John P Schwantes Jr May 20, 2010

    $259 Buys the fuel pump and Hanger assembly with the wire harness to make the (nearly universal) GM pump system fit. The shops that you took it to before it quit altogether did'nt scope the fuel pump power wire and it they did they would have condemened the old pump even though it was working

  • John P Schwantes Jr May 21, 2010

    Fuel pumps come and go. they tend to work good as new as their working. beat on the tank shakes them when they quit and the pump comes back on. But it's bad. Crank sensers vary how they fail from random misfriesP0300 to dead


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Don't know if u still need the help but I have a 2001 chevy silverado 2500 HD 8.1 and it was cutting off on me and finally just wouldn't crank at all . Never could get a straight answer from chevy techs or mechanics but it is your crank shaft sensor . Chevy currently has a recall on this problem but only for the 2500 not the HD so it only cost me about $170 to replace and if this is your problem please call chevy and report it b/c they are not recalling the problem in the 2500 HD because they have not had enough people complain or report it ..I am still waiting for them to refund me my money for this defect. ut yes the crank shaft sensor sovled my problem hasn't had that issue at all since I replaced it. Hope this helps someone out there

Posted on Jun 27, 2012

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I have the same size engine it was doing the exact samething chage the crankshaft sensor you will be wasting money on all the rest i changed mine and it runs like new more horsepower better responce

Posted on May 21, 2010

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