Replaced ignition switch doing it again after 5 months with new switch
On GM vehicles starting back in mid 2000's , maybe even before that. They started using inputs to the body control module from the ignition switch, from there the BCM controls all vehicle systems .
The chart indicates the power modes detected and transmitted by the BCM:
Power Mode Description and Operation
Serial Data Power Mode
On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle the PMM is the body control module (BCM). The BCM uses 3 signals from the ignition switch. These are the Ignition 0, Ignition 1, and Accessory.
To determine the correct power mode the BCM uses:
?€¢
The state of these signals
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The sequence of switch closures received by the BCM
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The status of the engine run flag
SOURCE: 1997 GMC Jimmy sometimes will not start
I had a similar problem several years ago on my 97 Jimmy. There is a switch in the steering column that had gone bad, had to be replaced and no problem since. The symptons sounded just like yours. My trusted mechanic found the problem after a lot of testing and fixed it.
SOURCE: 2006 GMC ENVOY starter not turning over, with ignition switch on.
the ignition switch is a problem with these vehicles so that would be my first call.
SOURCE: 2002 GMC Envoy, i put the key in ignition and
Ignition switch and neutral safety switch. Next time it happens wiggle thekeys in the ignition switch and try to restart.If it starts its probably the ignition switch. Then locate neutral safety switch on brake pedal and put meter on B+ wire from switch to starter relay and see if you get B+ on the would -be- crank. Next locate B+ wire from starter relay to starter hook a meter to it and see if you get B+ on the would -be crank.
Where ever B+ is missing is your problem.
SOURCE: I replaced fuel pump and
not knowing what kind of vehicle it is it is hard to tell. some gm cars and trucks have oil sending units that will not allow the vehicle to start unless it has oil pressure. they start going out and sometimes they start and sometimes they won"t.
SOURCE: key will turn and all
Check relay #47 in the underhood fuse panel, this relay is for the starter.
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