2000 GMC Jimmy 4WD

2000 GMC JIMMY
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FIREFIGHTER241154
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2000 GMC Jimmy V6 Four Wheel Drive Automatic 176000 miles
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On the Jimmy my wife drives the 4WD light on the dash flashes when you try to engage 4lo, 4Hi, or auto 4wd. Thw 4Wd drive will not enage 4 Hi on the fly you have to stop and put the vehicle in neutral place it into 4 Lo and then push 4 hi and it will switch from 4 Lo to 4 Hi. however the lights do not change to a solid colr like they used to. now they just blink continously unless you are in 2 Hi. We bought a new switch thinking that it had something to do with it, but that was not the case. Is there anyone out there that can help?
Dec 8, 2007 at 12:30 PM
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2CARPRO JACK
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Have the PCM scanned for ALL codes. Should have stored a code if the lights are flashing.Need to scan for "B" (body) codes not just "P"
Dec 9, 2007 at 8:18 AM
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FIREFIGHTER241154
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[how do i scan for those codes. the same way i get the engine codes and will a engine code scanner work
Dec 9, 2007 at 7:34 PM
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2CARPRO JACK
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Depends on the scanner. Most inexpensive scanners only do "P" codes,that is where most driveability problems are found. Does it give you a selection menu, or just reads when plugged in?
Dec 10, 2007 at 7:26 AM